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Sjölander, Emma
Publikationer (10 of 15) Visa alla publikationer
Payandeh, M., Sjölander, E., Jarfors, A. E. . & Wessen, M. (2015). Mechanical And Thermal Properties Of Rheocast Telecom Component Using Low Silicon Aluminium Alloy In As-Cast And Heat-Treated Conditions. In: Margaret Hyland (Ed.), Light Metals 2015: . Paper presented at TMS 2015 144th Annual Meeting & Exhibition. Hoboken, NJ: John Wiley & Sons
Öppna denna publikation i ny flik eller fönster >>Mechanical And Thermal Properties Of Rheocast Telecom Component Using Low Silicon Aluminium Alloy In As-Cast And Heat-Treated Conditions
2015 (Engelska)Ingår i: Light Metals 2015 / [ed] Margaret Hyland, Hoboken, NJ: John Wiley & Sons, 2015Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The growing demand for increasingly more cost and energy effective electronics components is a challenge for the manufacturing industry. To achieve higher thermal conductivity in telecom components, an aluminum alloy with a composition of Al-2Si-0.8Cu-0.8Fe-0.3Mn was created for rheocasting. Yield strength and thermal conductivity of the material were investigated in the as cast, T5 and T6 heat-treated conditions. The results showed that in the as-cast condition thermal conductivity of 168 W/mK and yield strength of 67 MPa was achieved at room temperature. A T5 treatment at 200°C and 250°C increased thermal conductivity to 174 W/mK and 182 W/mK, respectively, while only a slight increase in yield strength was observed. Moreover, a T6 treatment resulted in similar thermal conductivity as the T5 treatment at 250°C with no significant improvement in yield strength. Therefore, the T5 treatment at 250°C was suggested as an optimum condition for the current alloy composition.

Ort, förlag, år, upplaga, sidor
Hoboken, NJ: John Wiley & Sons, 2015
Nyckelord
SSM HPDC, Thin-wall component, RheoMetal process, Thermal conductivity, Heat treating process
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:hj:diva-24859 (URN)10.1002/9781119093435.ch37 (DOI)9781119082446 (ISBN)9781119093435 (ISBN)
Konferens
TMS 2015 144th Annual Meeting & Exhibition
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2014-10-08 Skapad: 2014-10-08 Senast uppdaterad: 2016-08-22Bibliografiskt granskad
Sjölander, E., Payandeh, M., Jarfors, A. E. & Wessén, M. (2015). Thermal conductivity of liquid cast and rheocast telecom component using Al-6Si-2Cu-Zn (Stenal Rheo 1) in as-cast and heat treated condition. Jönköping: Jönköping University, School of Engineering
Öppna denna publikation i ny flik eller fönster >>Thermal conductivity of liquid cast and rheocast telecom component using Al-6Si-2Cu-Zn (Stenal Rheo 1) in as-cast and heat treated condition
2015 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

The thermal conductivity of a rheocast telecom component produced using Al-6Si-2Cu-Zn alloy (Stenal Rheo 1) was investigated in the as-cast, T5 and T6 conditions. Conventionally liquid cast samples were produced in a permanent mold and used as a reference material. In the rheocast component in as-cast condition, a thermal conductivity of 153 W/mK at room temperature were measured. A T5 treatment at 250 or 300°C increased thermal conductivity to 174 W/mK. A T6 treatment resulted in further increase in thermal conductivity to 182 W/mK. The liquid cast alloy exhibited a lower thermal conductivity and a higher hardness for all conditions compared to the as-rheocast component.The microstructure of rheocast component showed material consisted of relatively large α1-Al particles formed during the slurry fabrication process and fine α2-Al particles formed in the die cavity. The macrosegregation in the form of the different ration of the primary α1-Al particles to secondary α2-Al particles in different positions of the rheocast component was observed. The relation between microstructural characteristics and thermal diffusivity was investigated by determining the local thermal conductivity in the rheocast component and ration of α1-Al particles to α2-Al particles. The results revealed that samples from the regions of the component with a high amount of α1-Al particles had a higher thermal conductivity. WDS measurement results pointed to that Si and Cu concentration in the α1-Al particles contained lower concentrations value compare to the α2-Al particles and therefore α1-Al particles has higher value for thermal conductivity.Silicon precipitation was confirmed using calorimetry and dilatometry to take place between 200 and 250°C. A linear relation between the fraction of Si precipitates formed and the increase in thermal diffusivity was obtained. Silicon in solid solution is shown to have a strong influence (negative) on thermal conductivity. When the silicon is precipitated by heat treatment the thermal conductivity increases. For an optimal combination of thermal and mechanical properties it is therefore important to use an ageing temperature above the temperature for Si precipitation.

Ort, förlag, år, upplaga, sidor
Jönköping: Jönköping University, School of Engineering, 2015. s. [19]
Serie
JTH research report, ISSN 1404-0018 ; 2015-01
Nyckelord
Thermal conductivity, Microstructure characteristics, Stenal Rheo1 alloy, Rheo-casting, High pressure die-casting
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:hj:diva-26296 (URN)
Forskningsfinansiär
KK-stiftelsen, 20100203
Tillgänglig från: 2015-03-30 Skapad: 2015-03-30 Senast uppdaterad: 2016-08-12Bibliografiskt granskad
Sjölander, E. & Seifeddine, S. (2014). Optimization of solution treatment of cast Al-7Si-0.3Mg and Al-8Si-3Cu-0.5Mg alloys. Metallurgical and Materials Transactions. A, 45(4), 1916-1927
Öppna denna publikation i ny flik eller fönster >>Optimization of solution treatment of cast Al-7Si-0.3Mg and Al-8Si-3Cu-0.5Mg alloys
2014 (Engelska)Ingår i: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 45, nr 4, s. 1916-1927Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The influence of solidification rate on the solution-treatment response has been investigated for an Al-7Si-0.3Mg alloy and an Al-8Si-3Cu-0.5Mg alloy. The concentrations of Mg, Cu, and Si in the matrix after different solution-treatment times were measured using a wavelength dispersive spectrometer. All Mg dissolves into the matrix for the Al-Si-Mg alloy when solution treated at 803 K (530 C) because the π-Fe phase is unstable and transforms into short β-Fe plates which release Mg. The Q-Al5Mg8Cu2Si6 phase do not dissolve completely at 768 K (495 C) in the Al-Si-Cu-Mg alloy and the concentration in the matrix reached 0.22 to 0.25 wt pct Mg. The distance between π-Fe phases and Al2Cu phases was found to determine the solution-treatment time needed for dissolution and homogenization for the Al-Si-Mg alloy and Al-Si-Cu-Mg alloy, respectively. From the distance between the phases, a dimensionless diffusion time was calculated which can be used to estimate the solution-treatment times needed for different coarsenesses of the microstructure. A model was developed to describe the dissolution and homogenization processes.

Nyckelord
Dissolution, Homogenisation, Cast aluminium, WDS
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-16311 (URN)10.1007/s11661-013-2141-9 (DOI)000333525200030 ()2-s2.0-84898857263 (Scopus ID)
Tillgänglig från: 2011-10-10 Skapad: 2011-10-10 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Sjölander, E. & Seifeddine, S. (2013). Influence of alloy composition, solidification rate and artificial aging on plastic deformation behaviour of Al-Si-Cu-Mg casting alloys. International Journal of Cast Metals Research, 26(1), 28-36
Öppna denna publikation i ny flik eller fönster >>Influence of alloy composition, solidification rate and artificial aging on plastic deformation behaviour of Al-Si-Cu-Mg casting alloys
2013 (Engelska)Ingår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 26, nr 1, s. 28-36Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The plastic deformation behaviour of three Al–Si casting alloys was investigated using the Kocks–Mecking strain hardening theory. Three coarsenesses of the microstructure, two aging temperatures and a number of aging times were used. For Al–Si–Mg and Al–Si–Cu–Mg alloys,the dislocation storage rate decreases while the dislocation recovery rate increases with agingtime during underaging, whereas the concentration of alloying elements in solid solution decreases. The storage rate reaches a minimum at the peak aged condition and increases at overaging. The storage and recovery rates of the Al–Si–Cu alloy increase with aging time in the underaged condition and start to decrease during overaging, which indicates that a mixture of shearable and non-shearable precipitates are present during underaging, whereas all precipitates become non-shearable on overaging.

Ort, förlag, år, upplaga, sidor
Maney Publishing, 2013
Nyckelord
Tensile testing, aluminium alloys, casting, heat treatment, strain hardening.
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-16310 (URN)10.1179/1743133612Y.0000000025 (DOI)000313743800004 ()2-s2.0-84872713837 (Scopus ID)
Tillgänglig från: 2011-10-10 Skapad: 2011-10-10 Senast uppdaterad: 2018-10-15Bibliografiskt granskad
Seifeddine, S., Sjölander, E. & Bogdanoff, T. (2013). On the role of copper and cooling rates on the microstructure, defect formations and mechanical properties of Al-Si-Mg alloys. Materials Sciences and Applications, 4(3), 171-178
Öppna denna publikation i ny flik eller fönster >>On the role of copper and cooling rates on the microstructure, defect formations and mechanical properties of Al-Si-Mg alloys
2013 (Engelska)Ingår i: Materials Sciences and Applications, ISSN 2153-117X, E-ISSN 2153-1188, Vol. 4, nr 3, s. 171-178Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper aims to assess the role of Cu on Al-Si-Mg alloys, in a range of 0 - 5 wt%, qualitatively on microstructure, defect formation, in terms of porosity, and strength in the as-cast conditions. The ternary system of Al-Si-Mg, using the A356 alloy as a base material, were cast using the gradient solidification technique; applying three different solidification rates to produce directional solidified samples with a variety of microstructure coarsenesses. Microstructural observations reveal that as the Cu levels in the alloys are increased, the amounts of intermetallic compounds as well as the Cu concentration in the α-Al matrix are increased. Furthermore, the level of porosity is unaffected and the tensile strength is improved at the expense of ductility.

Ort, förlag, år, upplaga, sidor
Scientific Research Publishing, 2013
Nyckelord
Aluminium-Silicon Alloys, Microstructure, Mechanical Properties, Gradient Solidification
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-20207 (URN)10.4236/msa.2013.43020 (DOI)
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2013-01-09 Skapad: 2013-01-09 Senast uppdaterad: 2018-09-13Bibliografiskt granskad
Sjölander, E. & Seifeddine, S. (2012). Influence of natural ageing on the artificial ageing response of Al-Si casting alloys. In: Conference on High Tech Die Casting: Innovation, Perspectives & Challenges in Pressure Die Casting of Light Alloys. Paper presented at 5th High Tech Die Casting 2012.
Öppna denna publikation i ny flik eller fönster >>Influence of natural ageing on the artificial ageing response of Al-Si casting alloys
2012 (Engelska)Ingår i: Conference on High Tech Die Casting: Innovation, Perspectives & Challenges in Pressure Die Casting of Light Alloys, 2012Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:hj:diva-18973 (URN)
Konferens
5th High Tech Die Casting 2012
Tillgänglig från: 2012-07-04 Skapad: 2012-07-04 Senast uppdaterad: 2015-10-02Bibliografiskt granskad
Schneider, M., Schaefer, W., Sjölander, E., Seifeddine, S. & Svensson, I. L. (2012). Simulation of Microstructure and Mechanical Properties of Aluminum Components during Casting and Heat Treatment. Paper presented at Modeling of Casting, Welding and Advanced Solidification Processes.
Öppna denna publikation i ny flik eller fönster >>Simulation of Microstructure and Mechanical Properties of Aluminum Components during Casting and Heat Treatment
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2012 (Engelska)Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-18970 (URN)
Konferens
Modeling of Casting, Welding and Advanced Solidification Processes
Tillgänglig från: 2012-07-04 Skapad: 2012-07-04 Senast uppdaterad: 2017-08-14Bibliografiskt granskad
Sjölander, E. & Seifeddine, S. (2012). The influence of natural ageing on the artificial ageing response of Al-Si-Cu-Mg casting alloys. La Metallurgia Italiana, 11-12, 39-43
Öppna denna publikation i ny flik eller fönster >>The influence of natural ageing on the artificial ageing response of Al-Si-Cu-Mg casting alloys
2012 (Engelska)Ingår i: La Metallurgia Italiana, ISSN 0026-0843, Vol. 11-12, s. 39-43Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The T6 heat treatment is commonly used to increase the strength of gravity cast Al-Si components containing Cu and/or Mg. The artificial ageing response is known to be affected by the thermal history, such as solution treatment, quench rate, natural ageing and heating rate to the artificial ageing temperature. The influence of natural ageing on the artificial ageing response was investigated for three alloys; Al-8Si-0.4Mg, Al-7Si-3Cu and Al-8Si-3Cu-0.4Mg. Natural ageing had a strong influence on the ageing response of the Al-Si-Mg alloy in the underaged condition and the strength increase was strongly reduced. Despite this, the time to peak yield strength as well as its magnitude were not strongly affected by natural ageing. No clear influence of natural ageing was observed for the Al-Si-Cu alloy. For the Al-Si-Cu-Mg alloy the ageing response seems to depend on the natural ageing time. Natural ageing of 3 weeks shifted the peak yield strength to shorter ageing times and its magnitude was decreased a little compared to direct ageing after quench. Natural ageing of 1 day gave the least beneficial properties after artificial ageing.

Ort, förlag, år, upplaga, sidor
Milano: Associazione Italiana di Metallurgia, 2012
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-20261 (URN)000313596700005 ()2-s2.0-84874144321 (Scopus ID)
Tillgänglig från: 2013-01-17 Skapad: 2013-01-17 Senast uppdaterad: 2018-10-15Bibliografiskt granskad
Sjölander, E. & Seifeddine, S. (2011). Artificial ageing of Al–Si–Cu–Mg casting alloys. Materials Science & Engineering: A, 528(24), 7402-7409
Öppna denna publikation i ny flik eller fönster >>Artificial ageing of Al–Si–Cu–Mg casting alloys
2011 (Engelska)Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 528, nr 24, s. 7402-7409Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The T6 heat treatment is commonly used for gravity cast Al-Si-Cu-Mg alloys. The influence of the alloying elements Cu and Mg and the artificial ageing temperature on the age hardening response were investigated. Artificial ageing was conducted at 170°C and 210°C for various times for three alloys, Al-7Si-0.3Mg, Al-8Si-3Cu and Al-8Si-3Cu-0.5Mg, cast with three different solidification rates (secondary dendrite arm spacing of about 10, 25 and 50μm). The coarseness of the microstructure has a small influence on the yield strength, as long as the solution treatment is adjusted to obtain complete dissolution and homogenisation. The peak yield strength of the Al-Si-Mg alloy is not as sensitive to the ageing temperature as the Al-Si-Cu and Al-Si-Cu-Mg alloys are. The ageing response of the Al-Si-Cu alloy is low and very slow. When 0.5 wt% Mg is added the ageing response increases drastically and a peak yield strength of 380 MPa is obtained after 20 h of ageing at 170°C for the finest microstructure, but the elongation to fracture is decreased to 3%. The elongation to fracture decreases with ageing time in the underaged condition as the yield strength increases for all three alloys. A recovery in elongation to fracture of the Al-Si-Cu-Mg alloy on overageing is obtained for the finest microstructure, while the elongation remains low for the coarser microstructures. The quality index, Q= YS +Kε, can be used to compare the quality of different Al-Si-Mg alloys. This is not true for Al-Si-Cu-Mg alloys, as K depends on the alloy composition. Overageing of the Al-Si-Mg alloy results in a decrease in quality compared to the underaged condition

Ort, förlag, år, upplaga, sidor
Elsevier, 2011
Nyckelord
Age hardening; Aluminium alloys; Casting; Mechanical characterization
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-16250 (URN)10.1016/j.msea.2011.06.036 (DOI)
Tillgänglig från: 2011-10-05 Skapad: 2011-10-05 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Sjölander, E. & Seifeddine, S. (2011). Evaluating the plastic deformation of Al-Si-Cu-Mg casting alloys using the Hollomon and Ludwigson equations. International Journal of Cast Metals Research
Öppna denna publikation i ny flik eller fönster >>Evaluating the plastic deformation of Al-Si-Cu-Mg casting alloys using the Hollomon and Ludwigson equations
2011 (Engelska)Ingår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336Artikel i tidskrift (Övrigt vetenskapligt) Submitted
Abstract [en]

The plastic part of true stress – true strain curves of three Al-Si casting alloys was evaluated using the Hollomon and Ludwigson equations. Three coarsenesses of the microstructure, two ageing temperatures and a number of ageing times were used. The Hollomon equation was able to describe the true stress – true strain curves for microstructures containing shearable precipitates, while the Ludwigson equation was needed for microstructures containing a supersaturated solid solution. A two bump shape appeared on the double logarithmic plot for the Al-Si-Cu alloy and the overaged Al-Si-Cu-Mg alloy. These curves could not be well described by the Hollomon or the Ludwigson equations.

Ort, förlag, år, upplaga, sidor
Maney Publishing, 2011
Nyckelord
Cast aluminium alloys; Plastic deformation; Artificial ageing; Hollomon; Ludwigson
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hj:diva-16309 (URN)
Tillgänglig från: 2011-10-10 Skapad: 2011-10-10 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
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