Mechanical Properties of Al–30Si–5Fe Alloy Using Combination of Rapid Solidification and Thixoforming Processes

Mechanical Properties of Al–30Si–5Fe Alloy Using Combination of Rapid Solidification and... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallography, Microstructure, and Analysis Springer Journals

Mechanical Properties of Al–30Si–5Fe Alloy Using Combination of Rapid Solidification and Thixoforming Processes

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC and ASM International
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology
ISSN
2192-9262
eISSN
2192-9270
D.O.I.
10.1007/s13632-017-0388-z
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Metallography, Microstructure, and AnalysisSpringer Journals

Published: Oct 30, 2017

References

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