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Mechanical properties of Al–30Si–5Fe alloy using combination of rapid solidification and thixoforming processes

Shafizadeh, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s13632-017-0388-z
  3. Abstract:
  4. In this study, a combination of rapid solidification (melt-spinning) and semisolid forming (thixoforming) processes was used to refine the coarse microstructure of “as-cast” Al–30Si–5Fe alloy and improve its mechanical properties. Al–30Si–5Fe ribbons produced by the melt-spinning process were pulverized and subsequently consolidated at 300 °C in an argon atmosphere. Prepared specimens were thixoformed at temperatures ranging from 580 to 700 °C for various holding times. Some cast samples were also directly thixoformed as reference. In all thixoformed samples, microstructures were modified and needle-like intermetallic compounds as well as silicon particles in the as-cast part were changed into rounded corners or polygonal shapes with uniform distribution. Macro-hardness of up to 165 HV10 (which is almost twice as much as-cast sample) was obtained from a meltspun sample held for 5 min at 700 °C and then thixoformed. Compression strength and malleability increased 31 and 57%, respectively, and a 33% reduction in wear coefficient was obtained in this sample compared to the as-cast alloy. © 2017, Springer Science+Business Media, LLC and ASM International
  5. Keywords:
  6. Al–Si alloys ; Wear ; Intermetallics ; Mechanical properties ; Melt spinning ; Microstructure ; Rapid solidification ; Silicon alloys ; Silicon compounds ; Solidification ; Wear of materials ; Coarse microstructure ; Compression strength ; Melt spinning process ; Semi-solid forming ; Si alloys ; Thixo-forming ; Thixoforming process ; Uniform distribution ; Aluminum
  7. Source: Metallography, Microstructure, and Analysis ; Volume 6, Issue 6 , 2017 , Pages 502-511 ; 21929262 (ISSN)
  8. URL: https://link.springer.com/article/10.1007/s13632-017-0388-z