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  • 13101.
    Jarfors, A. E. W.
    Swed. Institute for Metals Research, Stockholm, Sweden.
    Melting and coarsening of A356 during preheating for semisolid forming2004In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 17, no 4, p. 229-237Article in journal (Refereed)
    Abstract [en]

    The melting and coarsening behaviour of A356 during preheating for semisolid forming has been investigated theoretically and experimentally. The preheating involves a relatively rapid heating and a partial melting, transforming the material into a mushy state, i.e. a mixture of solid particles and melt. The experiments reveal a change in melting behaviour over the temperature interval 580-590°C, where a re-solidification occurs during heating. During the initial phase of melting, the smallest solid particles melt completely and larger particles are split into smaller particles, making the shape of the particles more irregular. Particle fragmentation influences the occurrence of the enclosed eutectic, which temporarily maintains a higher solid fraction as a result of increased diffusion distances. Resolidification and coarsening contribute to a rapid particle size increase. The model derived fits the experimental series well and supports the coarsening and particle fragmentation observations. © 2004 W. S. Maney & Son Ltd.

  • 13102.
    Jarfors, A. E. W.
    Department of Materials Processing, Royal Institute of Technology, Metals Casting Research Group, Stockholm, Sweden.
    On the design of a rotary spray former: Experimental and theoretical background1997In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 71, no 3, p. 440-455Article in journal (Refereed)
    Abstract [en]

    The phenomenological theory for jet stability and spray formation in centrifugal spraying is reviewed and investigated experimentally. The appropriate set of equations is then adapted to the phenomena found in the present study. The flow on the disk is treated both theoretically, as well as experimentally, leading to the possible design of a spray former. The droplet formation mechanisms are studied implicitly in the experiments, three different modes being found. A bi-modal spray is formed from the disk edge by two modes of disintegration, whilst the third mode is caused by instability at jet impact on the disk and causes a tri-modal spray. The boundary conditions for the release and flight of the droplets are treated theoretically and correlated experimentally. Water was used initially as a model material, due to the ease of direct visual observation, the knowledge acquired then being used to interpret experiments where an A17Si0.3Mg alloy is sprayed. The experimentally-obtained parameters are used in a theoretical treatment to predict the flow on the disk, i.e. the spray directions and the flight of the droplets. The general conclusion is that it is feasible to design a rotary spray former with a directed flow, the key issue being to control the jet width and the actual droplet formation at the disk edge. ©1997 Elsevier Science S.A.

  • 13103.
    Jarfors, A. E. W.
    Royal Institute of Technology, KTH, Department of Materials Processing, Stockholm, Sweden.
    Peritecticlike precipitation of titanium carbide in Al-Ti-C melts at 1373 K1999In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 15, no 5, p. 481-494Article in journal (Refereed)
    Abstract [en]

    The reaction between an Al-Ti melt and a carbon containing medium, i.e. pure graphite or molten aluminium containing aluminium carbide, was studied. Experiments were carried out at 1373 K, using three different experimental setups. Depending on the carbon source, titanium carbide precipitated as a layer or as free particles. Classical nucleation theory for homogeneous and heterogeneous nucleation is used to assess the surface tension. The influence of stoichiometry on surface tension and nucleation is discussed. The formation of a continuous layer, or peritecticlike precipitation of titanium carbide, is theoretically analysed. The growth of the layer is rate controlled by the mass transfer of carbon at the interface, plausibly as a result of the ordering tendencies in titanium carbide. The degeneration of precipitation into that of freely formed particles is found to be nucleation controlled. A model for degenerate precipitation is proposed, including predictions of the reaction front compositions, growth rate, and particle fractions in a dilute ternary system. The model is in good agreement with experiments, after compensating for settling of the precipitates, except in predicting the precipitated fractions. © 1999 IoM Communications Ltd.

  • 13104.
    Jarfors, A. E. W.
    Royal Institute of Technology, Department of Materials Processing, Stockholm, Sweden.
    Solidification behaviour of AI-7% Si-0.3% Mg during rotary spray forming1998In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 33, no 15, p. 3907-3918Article in journal (Refereed)
    Abstract [en]

    The solidification behaviour of an AI-7% Si-0.3% Mg alloy during rotary spray forming was studied. The ability to form a coating was insensitive to the thermal processing parameters, yielding material exchangess greater than 90%. The level of porosity varied typically between 1.5 and 4.75%. The dendrite arm spacing was evaluated and used to estimate the cooling rates. Typical dendrite secondary arm spacings were of the orderof 3 jam, 12 (am and 25 ÎŒm, corresponding to cooling rates of 4630 K s-1 72 K s-1 and 8 K s -1 respectively. The fraction primary precipitation was experimentally determined and the partition coefficient calculated indirectly using the Scheil equation. The partition coefficient is increased during rotary spray forming. This is explained by the presence of trapped vacancies at the solidification front. The vacancies change the solid's free energy and thus change the phase diagram and the partition coefficient. A simplistic analysis of entrapment and condensation of vacancies and their influence on the partition coefficient is made. © 1998 Kluwer Academic Publishers.

  • 13105.
    Jarfors, A. E. W.
    Department of Materials Processing, Royal Institute of Technology, Stockholm, Sweden.
    Solubility of copper in titanium carbide1996In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 12, no 12, p. 990-994Article in journal (Refereed)
    Abstract [en]

    The solubility of copper in titanium carbide (TiCx) was studied experimentally. The solubility was assessed in two different ways: (a) titanium carbide was added to a copper-titanium melt, (b) titanium carbides formed in situ, from graphite and titanium, were analysed. The stoichiometries were implicitly assessed. The solubility of copper in titanium carbide was found to decrease with increasing carbon content. This behaviour was compared to the solubility of chromium in titanium carbide, which increases in solubility with increasing carbon content. The role of vacancies in the solution is briefly discussed. © 1996 The Institute of Materials.

  • 13106.
    Jarfors, A. E. W.
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Butler, D. L.
    Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
    Goi, K. L. S.
    Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
    Microstructure formation of porous sintered Ti-Si-Zr compacts with mechanically alloyed-activated Ti-Si and TiH2 powders2014In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 594, p. 202-210Article in journal (Refereed)
    Abstract [en]

    Metallic implants are widely used in applications associated with bone. A major drawback of using metals is their elastic modulus which is higher than that of bone resulting in stress shielding and premature failure of the implant. The employment of biomaterials with a porous structure has the potential to lower the modulus and promote osseointegration. The present work investigates the microstructure formation and the resulting elastic modulus of a new Ti-Si-Zr alloy. The sintering procedure involves the use of both mechanically alloyed Ti-Si powder and TiH2 to activate sintering with the TiH2 also serving as a pore precursor. The procedure is designed to promote bonding but not consolidation. The influence of sintering temperature, heating rate, as well as the amount and size of the TiH2 on the phases formed and porosity was investigated. It was observed that the use of TiH2 increased the degree of porosity whilst the size of TiH2 particles could be used to control the pore size. The results showed that when using small TiH2 particles, the elastic modulus was strongly dependent on the fraction of TiH2. When large TiH2 particles were used, the porosity had no significant influence on the elastic modulus. The variation in behavior could be attributed to differences in microstructure. To control the bulk modulus it is essential to understand the differences in the microstructure formation mechanisms between these two cases. (C) 2014 Elsevier B.V. All rights reserved.

  • 13107.
    Jarfors, A. E. W
    et al.
    Department of Materials Processing, Royal Institute of Technology, Metal Casting Research Group, Kungl Tekniska Hogskolan, Stockholm, Sweden.
    Keife, H.
    Outokumpu Copper, Process Automation, Västerås, Sweden.
    Antonsson, T.
    Department of Materials Processing, Royal Institute of Technology, Metal Casting Research Group, Kungl Tekniska Hogskolan, Stockholm, Sweden.
    Deformation enhanced liquid phase sintering (DELPS): A study on the use of partial adiabatic melting during powder consolidation2002In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 127, no 2, p. 159-164Article in journal (Refereed)
    Abstract [en]

    The presence of a liquid phase enhances the pore closure of a porous body, which is used in liquid phase sintering (LPS). During LPS, a substantial grain growth may occur by coalescence or Ostwald ripening, thus a short time in the liquid state is advantageous. Furthermore, it has been shown that during the initial stage of LPS, agglomerates are disintegrated and a significant reduction of grain size occurs. Heavy deformation causes an adiabatic temperature increase, which may result in a partial melting of the powder. Short-time duration deformation-assisted LPS, so called deformation enhanced LPS (DELPS), may thus be a suitable route for the fabrication of difficult-to-form materials. The present study is a feasibility test of DELPS. Three different types of materials were tested. The first type was an Al-Si with the possibility to form a large fraction of liquid phase. The second type was a W-based powder mixture yielding a low fraction liquid. The third type was a Ni-Al powder mixture exhibiting an exothermal behaviour when reaction occurs. The powders were hot compacted in a flexible die allowing large deformations. The specimens were examined and the composition of the phases were analysed. All of the samples, but one, showed near full density (>98%). Evidence of melting was found and in the W-base and the Ni-Al powder mixtures, and reaction had occurred in the Ni-Al mixture. © 2002 Elsevier Science B.V. All rights reserved.

  • 13108.
    Jarfors, A. E. W.
    et al.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    Sim, G. C.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    San, T. E.
    Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.
    Influence of Process Parameters on Reaction Products during Self-Propagating High-Temperature Synthesis of Porous NiTi2003In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 437-438, p. 475-478Article in journal (Refereed)
    Abstract [en]

    NiTi is proposed to be a biomaterial suitable for bone replacements. Reactive synthesis, Self-Propagating High-Temperature Synthesis (SHS) of NiTi from Ni and Ti powder is a suitable method to produce porous structures to promote osseointegration. The influence of pressed density and ignition temperature on the reaction products formed is investigated. Porosity after pressing was 20%, 30% and 40 % and ignition temperatures were 400°C, 500°C and 600°C. The reaction products found were NiTi, as well as Ti2Ni and Ni3Ti, in addition to residual Ni and Ti. The amount of NiTi formed increases with ignition temperature, with a maximum at an initial porosity of 30% and ignition temperature of 600°C. This coincides with the minimum amount of residual Ni and Ti. The reaction imbalance is caused by the formation of Ti2Ni at high pressed densities and by a preferential nucleation of Ni3Ti, both suggested to be dominated by the effective contact area between the Ni and Ti particles after pressing.

  • 13109.
    Jarfors, A. E. W.
    et al.
    Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
    Tong, S.
    Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
    Hu, B.
    Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
    Sharma, S. N.
    Integrated Magnesium Techologies, Singapore.
    Wee, C.
    Integrated Magnesium Techologies, Singapore.
    Mechanism of lubrication-induced surface cracking in hot chamber die cast thin-walled AZ91D parts2003In: Materials and Manufacturing Processes, ISSN 1042-6914, E-ISSN 1532-2475, Vol. 18, no 4, p. 637-641Article in journal (Refereed)
    Abstract [en]

    Thin-walled hot chamber die cast parts are often used to make telephone casings and similar products having primarily requirements on weight and aesthetically satisfying surfaces. The post casting surface treatment often generates a glossy appearance. The glossy appearance makes it extremely sensitive to small-scale flaws, such as blisters, cold shuts, and cracks. Hot chamber die casting of thin-walled parts requires high filling speed and the use of lubrication because the parts have high aspect ratios. In the manufacturing of such high aspect ratio parts with a wall thickness of 0.6 mm, a new type of cold crack induced by the lubrication is observed. To some extent this defect is similar to a blister, but the characteristic bump is not formed and the actual crack is formed by thermal contraction along the high aspect ratio areas.

  • 13110.
    Jarfors, A. E. W.
    et al.
    Singapore Institute of Manufacturing Technology.
    Yong, J. M. S.
    Singapore Institute of Manufacturing Technology.
    Kainer, K. -U
    GKSS Forschungszentrum Geesthacht Gmbh, Germany.
    Tan, M. -J
    Nanyang Technological University, Singapore.
    Preface2010In: Materials & Design, ISSN 0261-3069, Vol. 31, no SUPPL. 1, p. S1-Article in journal (Other (popular science, discussion, etc.))
  • 13111.
    Jarfors, A.
    et al.
    Casting of Metals, Royal Institute of Technology, Stockholm, Sweden.
    Fredriksson, H.
    Casting of Metals, Royal Institute of Technology, Stockholm, Sweden.
    Froyen, L.
    Department MTM, Katholieke Universiteit Leuven, De Croylaan 2, B-3030 Heverlee, Belgium.
    On the thermodynamics and kinetics of carbides in the aluminium-rich corner of the AlTiC phase diagram1991In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 135, no C, p. 119-123Article in journal (Refereed)
    Abstract [en]

    Aluminium composites have a great potential because of their high strength-to-weight ratio. Carbides will in the future be powerful reinforcements. To be able to manufacture these it is of importance to know the thermodynamic properties and the kinetic limitations. The objective of this investigation is to study the equilibria between the carbides occurring in the AlTiC system as well as the initial precipitation and dissolution behaviour of these carbides. It can be shown that there is a change in stability between TiC and Al4C3, depending on both composition and temperature. To study the nucleation and precipitation behaviour of the carbides in liquid aluminium and aluminium alloys a set of alloys were melted and heated to an appropriate temperature in graphite crucibles. The effect of time and the effect of composition on the chemical reactions involving carbides have been investigated. A theoretical analysis of both the thermodynamics and kinetics was performed, giving a tentative explanation. © 1991.

  • 13112.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Casting Alloy Design and Modification2016In: Metals, ISSN 2075-4701, Vol. 6, no 1, article id 15Article in journal (Other academic)
  • 13113.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Insitu formed aluminium composites1998In: Advanced light alloys and composites, 1998Conference paper (Refereed)
  • 13114.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Special section: Selected papers from the 3rd international Conference on Cast Metal matrix Composites2001Collection (editor) (Refereed)
  • 13115.
    Jarfors, Anders E. W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Yielding and failure of hot chamber die cast thin-walled AZ91D2016In: Metallurgia Italiana, ISSN 0026-0843, Vol. 108, no 6, p. 53-56Article in journal (Refereed)
    Abstract [en]

    Thin-walled components in AZ91D magnesium are commonly cast using hot chamber die casting. AZ91D mechanical properties commonly show scatter and its low critically resolved shear stress cause early yield with an ill-defined yield point. This may result in large differences between the true yield point or proportionality limit and the off-set proof stress. The current study takes a look at this and its relation to the failure of the component. The material investigated was a hot chamber die cast material with a wall thickness of 0.8mm. Tensile tests were made and the proportionality limit and off-set proof stress was established as well as elongation to failure and tensile strength. The overall average off-set proof stress was 154 MPa and the overall proportionality limit was 63 MPa resulting in a typical property Stress Gap of 91MPa. This difference varied from 65MPa up to 105MPa. The Apparent Toughness was also evaluated The Stress Gap and Apparent Toughness was analysed and the influence of process parameters established.

  • 13116.
    Jarfors, Anders E. W.
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Castagne, Sylvie J.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Danno, Atsushi
    Singapore Institute of Manufacturing Technology, Singapore.
    Zhang, Xinping
    School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.
    Tool wear and life span variations in cold forming operations and their implications in microforming2017In: TECHNOLOGIES, ISSN 2227-7080, Vol. 5, no 1, article id 3Article, review/survey (Refereed)
    Abstract [en]

    The current paper aims to review tooling life span, failure modes and models in cold microforming processes. As there is nearly no information available on tool-life for microforming the starting point was conventional cold forming. In cold forming common failures are (1) over stressing of the tool; (2) abrasive wear; (3) galling or adhesive wear, and (4) fatigue failure. The large variation in tool life observed in production and how to predict this was reviewed as this is important to the viability of microforming based on that the tooling cost takes a higher portion of the part cost. Anisotropic properties of the tool materials affect tool life span and depend on both the as-received and in-service conditions. It was concluded that preconditioning of the tool surface, and coating are important to control wear and fatigue. Properly managed, the detrimental effects from surface particles can be reduced. Under high stress low-cycle fatigue conditions, fatigue failure form internal microstructures and inclusions are common. To improve abrasive wear resistance larger carbides are commonly the solution which will have a negative impact on tooling life as these tend to be the root cause of fatigue failures. This has significant impact on cold microforming.

  • 13117.
    Jarfors, Anders E.W.
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zheng, Jinchuan
    China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-solid Metal Technology, Sanming, China.
    Chen, Liang
    RheoMet Light Metal Co., Ltd, Jiangle Economic Development Zone, Sanming, China.
    Yang, Jie
    KinRui Hi-Tech Co. Ltd, Sanming, China.
    Recent advances in commercial application of the rheometal process in China and Europe2019In: Semi-Solid of Alloys and Composites / [ed] Rassili A.,Midson S.P.,Zhu Q.,Gang Hu X., Trans Tech Publications, 2019, p. 405-410Conference paper (Refereed)
    Abstract [en]

    Recent advances in rheocasting have resulted in significant expansion in the types of products currently in full commercial production. The current paper gives an overview of components in production in Europe and in China produced using the RheoMetal™ process, that has taken the lead in a strong drive towards new heavy-duty applications made from aluminium alloys. In China, the dominating applications are found in the telecom industry. The trend in Europe is more towards marine and automotive applications commonly in fatigue loaded applications. The reason for the choice of rheocasting for complicated shape thin-walled electronics components with requirements is dominated by process yield and by the ability to improve thermal conductivity. The heavy-duty truck chassis thick walled components target weight reduction through design and to sustain fatigue load normally requiring forged components. Common in all applications are seen in production yield, reduced tool wear and reduction of die soldering.

  • 13118.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Matsushita, Taishi
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Bogdanoff, Toni
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Börrisson, Markus
    SWEREA Swecast.
    Beste, Ulrik
    VBN Components AB.
    Effect of Use in High Pressure Die Casting on Vibenite®60 Tool Inserts Madeby Additive Manufacturing2016In: DDMC2016 Frauenhofer Direct Digital Manufacturing Conference: Conference Proceedings, March 2016, Berlin, Germany / [ed] B. Müller, Fraunhofer IRB Verlag, 2016Conference paper (Refereed)
    Abstract [en]

    The thermo-physical and mechanical properties of Vibenite®60 was investigated in the as-manufactured, soft annealed and hardened state as well as after use in full scale high pressure die casting. Thermal conductivity in the as manufactured state was 23.3 to 27.5 W/mK in the temperature range from 25°C to 500°C. Annealing increased thermal conductivity to 25.0 up to 29.2 W/mK. Hardening reduced thermal conductivity of 19.8 to 26.1 W/mK. The tool wastested in production in the as fabricated state displayed a slight increase in thermal conductivity, which was interpreted as a slight tempering during use. Hardness measurements were made at room temperature and followed the same pattern as the thermo-physical properties. Rockwell and Vickers Hardness was lowest in the as lowest in the annealed state and hardest in the hardened state. Rockwell hardness was not affected by use in production while Vickers hardness decreased slightly.

  • 13119.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Rigovacca, Diego
    University of Padua, Italy.
    Payandeh, Mostafa
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jansson, Per
    COMPtech.
    Influence of process parameters on surface appearance and roughness of a low Si containing Al-alloy, in semisolid casting2015In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 217-218, p. 318-324Article in journal (Refereed)
    Abstract [en]

    The visual appearance and surface roughness were experimentally investigated inindustrial scale for a low silicon containing aluminium alloy cast in semisolid state integrated withHPDC machine. A visual comparative technique and surface roughness in the form of the Rq valuewere used to evaluate the surface appearance and the surface roughness respectively. The resultswere investigated statistically to find significant models. It was shown that high quality appearance,following a comparative scale, was possible using high die temperature and high injection speed. Itwas also found that improving the surface roughness will deteriorate the visual appearance.

  • 13120.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Metal casting2014In: Handbook of Manufacturing Engineering and Technology / [ed] Andrew Y. C. Nee, London: Springer, 2014, p. 309-410Chapter in book (Refereed)
  • 13121.
    Jarfors, Anders
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Olofsson, Jakob
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Critical Description of Defects and Mechanical Behaviour in Casting Process Modelling of Light Metals for Automotive Use2013In: Proceedings of the Twenty Second International Conference on Processing and Fabrication of Advanced Materials (PFAM-XXII), Singapore, 18-20 December, 2013, ACM Digital Library, 2013Conference paper (Refereed)
  • 13122.
    Jarfors, Anders
    et al.
    Royal Institute of technology.
    Svendsen, L
    Royal Institute of technology.
    Wallinder, M
    Royal Institute of technology.
    Fredriksson, H
    Royal Institute of technology.
    Reactions during infiltration of graphite fibres by molten Al-Ti alloy1993In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 24, no 11, p. 2577-2583Article in journal (Refereed)
    Abstract [en]

    The infiltration sequence of graphite fibers with liquid aluminum alloyed with titanium was studied. The titanium concentration was chosen such that a severe reaction occurred between the fibers and the melt. Aluminum carbide and titanium carbide, as well as an aluminide phase were formed. The phenomenon occurring during the infiltration sequence was explained with the aid of the ternary-phase diagram Al-Ti-C. The effect of the reaction on the infiltration height is discussed.

  • 13123. Jarfors, Björn
    et al.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Ordbok - dictionary: svensk - English: tillverkningsteknik - manufacturing technology2018Book (Other academic)
    Abstract [en]

    Preface: This dictionary is designed to facilitate studies in manufacturing technology and is a collaboration between teachers and students in mechanical andmaterials engineering at Jönköping University and Blekinge Institute ofTechnology.

  • 13124.
    Jargic, Svetozar
    Jönköping University, Jönköping International Business School, JIBS, Business Administration.
    Credit Spread Determinants: Significance of systematic and idiosyncratic variables2017Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Credit spread is the extra risk-reward that an investor is bearing for investing in corporate bonds instead of government bonds. Structural models, which are simple in their framework, fail to explain the occurring credit spread and underestimate the predicted credit spread. Hence, the need for new models and exploration of systematic and idiosyncratic variables arose. The present paper aims to investigate if the predictability of lower-medium investment grade bonds and non-investment grade bonds credit spread can be improved by incorporating systematic and idiosyncratic variables into a fixed effect panel data regression model, and whether the selected variables’ significance has high influence on credit spread or not. Initial results showed that fixed effect panel data regression model underperforms the structural models and under predicts the actual credit spread. The applied model explained 13.5% of the lower-medium investment grade bonds credit spread and 8.5% of non-investment grade bonds. Further, systematic variables have higher influence on lower-medium investment grade bonds and idiosyncratic variables have higher influence on non-investment grade bonds. The predictability of credit spread can be improved by employing correct explanatory variables which are selected based on the characteristics of the sample size.

  • 13125.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. HHJ. CHILD.
    Att nå sitt mål1993Report (Other (popular scientific, debate etc.))
  • 13126.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. HHJ. CHILD.
    Att välja inriktning i livet - verklighet eller illusion1993Report (Other scientific)
  • 13127.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Brukarinflytande på individnivå: verklighet eller illusion. Vetlanda2003Other (Other (popular science, discussion, etc.))
  • 13128.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Can social workers and clients be allies?: Worrying findings from Swedish and Australian disability research2008In: Transcending Global-Local Divides: Challenges for Social Work Education and Practice, 2008Conference paper (Refereed)
  • 13129.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Contradictions in Social Work - Codes of ethic and empowerment2010In: Social Professions for a Social Europe: Common challenges and discourses / [ed] Oldrich Chytil, Gunter J. Friesenhahn, Friedrich W. Seibel & Jochen Windheuser, Ostrava: ALBERT, , 2010, p. 265-279Chapter in book (Other academic)
  • 13130.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Contradictions in Social Work: codes of ethic and empowerment2009In: Social Professions for a Social Europe: Review - Insight - Prospects / [ed] Prof. Oldrich Chytil, Ostrava University, Prof. Gunther Friesenhahn, Koblenz University, Prof. Friedrich Seibel, Koblenz University & Jochen Windheuser Osnabruck University, Boskovice: Albert , 2009, p. 279-293Conference paper (Refereed)
  • 13131.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Empowerment or Disempowerment - processes of contradiction in the area of people with functional impairments2001Conference paper (Refereed)
  • 13132.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    En motsägelsefull organisering: om arbetsliv och språk2006In: Funktionshinder, vardagsliv, habilitering: 10:e forsknings- och utvecklingskonferensen i Örebro, 4-5 april 2006, 2006Conference paper (Other academic)
  • 13133.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Erfarenheter från ett forskninsprojekt om livsinflytande. Vad menas med inflytande? Hur ser dagen ut? 1993. Stockholm1993Other (Other (popular science, discussion, etc.))
  • 13134.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Ett perspektivbyte inom organiseringen av omsorg. 1993. HillerödConference paper (Refereed)
  • 13135.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. CHILD.
    Forskning i socialt arbete om utvecklingsstörning: upprätthållandet av en myt!1998In: Vetandets villkor - socialt arbete som kunskapsområde, Göteborg: Institutionen för socialt arbete , 1998, p. 14-Chapter in book (Other academic)
  • 13136.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Functional Impairments in Sweden named LSS. 1996. Malaga: Autonomy and EmpowermentConference paper (Refereed)
  • 13137.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Funktionshinder och arbete: Arbetsförmedlingen - mötesplats och språklig arena2006In: Vågor på HaVet: Tio texter om arbete och funktionshinder, Jönköping: Hälsohögskolan , 2006, p. 39-78Chapter in book (Other academic)
  • 13138.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Har utvecklingsstörda människor något inflytande i sin vardag? 1993. NorrköpingConference paper (Other academic)
  • 13139.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Individuell plan - en företeelse med många innebörder2002In: Vardagsliv Livskvalitet Habilitering: 8:e forskningskonferensen i Örebro den 13-14 mars 2002, 2002Conference paper (Other academic)
  • 13140.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Individuell plan: en företeelse med olika innebörder2002Report (Other academic)
  • 13141.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Research Platform of Social Work.
    Individuell plan/planering: ett instrument för frigörelse eller kontroll2000Conference paper (Other academic)
  • 13142.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Influence in everyday life - an important aspect of quality of life. 1994. New DelhiIn: A community for All - Families on the MarchConference paper (Refereed)
  • 13143.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Influence on Every day life for mentally retarded persons. 1992. BrisbaneIn: Sharing a Vision of the FutureConference paper (Refereed)
  • 13144.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Inflytande - illusion eller verklighet? Inflytande i praktiken. 1995 Helsingfors och Vasa.Conference paper (Other academic)
  • 13145.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Inflytande en aspekt av livskvalitet? 1995. Lidingö1995Other (Other (popular science, discussion, etc.))
  • 13146.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Inflytande genom individuell plan: verklighet eller önskedröm? 1998. UppsalaConference paper (Other academic)
  • 13147.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Inflytande i vardagslivet. 1993. NorrtäljeConference paper (Other academic)
  • 13148.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work.
    Inflytande i vardagslivet för utvecklingsstörda människor - illusion eller verklighet? 1993 VilhelminaConference paper (Other academic)
  • 13149.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. HHJ. CHILD.
    Inflytande i vardagslivet: närstudie av tre utvecklingsstörda personers inflytande i sitt vardagsliv1993Licentiate thesis, monograph (Other scientific)
  • 13150.
    Jarhag, Sven
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. CHILD.
    Inflytande i vardagslivet: närstudie av tre utvecklingsstörda personers inflytande i sitt vardagsliv1993Report (Other academic)
260261262263264265266 13101 - 13150 of 29187
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