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  • 1.
    Bladh, Madeleine
    et al.
    Swecast.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Dahle, Arne Kristian
    The University of Queensland.
    Shear band formation in shaped rheocast aluminium component at various plunger velocities2010In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 20, no 9, p. 1749-1755Article in journal (Refereed)
    Abstract [en]

    Significant progress has been made in recent years in understanding and modelling the rheology of semi-solid metals. These models show the effects of the microstructure in terms of size and morphology of globules on the material response. More recently it has been shown that semi-solid metals can behave as compacted granular materials such as sand. A particular signature of such deformation is that the deformation becomes concentrated into shear bands which are 10-20 grains wide. Such bands have also been observed in a range of cast products. Recently, it has been clearly shown that shear bands in high pressure die cast (HPDC) products are also the results of Reynolds dilatancy. Shear bands are also known to be a common feature in semi-solid metal products. The segregation banding in semi-solid metal (SSM) material and its dependence of plunger velocity were investigated. Shaped castings were made with the RHEOMETAL™ process with a range of different plunger velocities. The microstructural characteristics were investigated, with a particular emphasis on shear bands. It is shown that ingate velocities influence the location and characteristics of the shear bands.

  • 2.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Granath, Olof
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Effect of sodium modification on microstructure and mechanical properties of thick-walled AlSi6Cu2.5 rheocast component2010In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 20, no 9, p. 1643-1648Article in journal (Refereed)
  • 3.
    Zamani, Mohammadereza
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Iran.
    Amadeh, A.
    School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Iran.
    Lari Baghal, S. M.
    School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Iran.
    Effect of Co content on electrodeposition mechanism and mechanical properties of electrodeposited Ni-Co alloy2016In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 26, no 2, p. 484-491Article in journal (Refereed)
    Abstract [en]

    Ni-Co coatings with various cobalt contents were electrodeposited from modified Watts bath. The effect of cobalt content on electrodeposition mechanism of the coatings was studied by electro-chemical impedance spectroscopy method (EIS). Surface morphology and crystallographic structure of the coatings were investigated by means of SEM and XRD. Mechanical properties of the coatings were determined using Vickers microhardness and tensile tests. It was found that with increasing the Co2+ ions in electroplating bath, the charge transfer resistance (Rct) of Ni-Co film increased whereas the Warburg impedence decreased. This may be due to enhancement in coverage of cathode surface by Co(OH)2 and higher diffusion rate of metal ions towards cathode surface, respectively. Also, with increasing the cobalt content in the bath, cobalt content in the alloy coating increased anomalously and (111) texture consolidated gradually. With increasing the cobalt content up to 45% in alloy coating, the grain size decreased and consequently, hardness and strength of the alloy increased. Further enhancement of cobalt content up to 55% led to a little decrease in hardness and strength. The maximum ductility was observed for Ni-25%Co coating due to relatively small grain size and compact structure. © 2016 The Nonferrous Metals Society of China.

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