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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 12/2018

31-10-2018

A Low-Cost Lightweight Entropic Alloy with High Strength

Authors: Lei Shao, Tao Zhang, Lugee Li, Yuhong Zhao, Jinfeng Huang, Peter K. Liaw, Yong Zhang

Published in: Journal of Materials Engineering and Performance | Issue 12/2018

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Abstract

In this study, a series of lightweight Al–Mg system entropic alloys containing Zn, Cu, and Si were designed based on the order/disorder or entropy, and eutectic concepts. The alloys of Al58.5Mg31.5Zn4.5Cu4.5Si1; Al63Mg27Zn4.5Cu4.5Si1; Al66.7Mg23.3Zn4.5Cu4.5Si1; Al80Mg14Zn2.7Cu2.7Si0.6; Al85Mg10.5Zn2.025Cu2.025Si0.45; and Al90Mg7Zn1.35Cu1.35Si0.3 were prepared by induction melting under a high-purity argon atmosphere and then casted into stainless steel molds. The microstructures which were tested in the as-cast state exhibited multiphases and contained apparent volume fractions of intermetallic compounds and solid solutions. Then, the compressive mechanical properties of the alloys were measured, and high fracture strengths of 577, 677, 590, 498, 814, and 794 MPa, respectively, were determined. Strong hardening phenomena were observed in the Al80Mg14Zn2.7Cu2.7Si0.6, Al85Mg10.5Zn2.025Cu2.025Si0.45, and Al90Mg7Zn1.35Cu1.35Si0.3 alloys at room temperature, with amazing plasticity percentages of 13.8, 24.8, and 32.7%, respectively. The property differences in the lightweight alloys were analyzed using the following parameters: the critical values of the enthalpy of mixing; atomic size differences; ratio of entropy to enthalpy; valence electron concentration (VEC); and Pauling electronegativity difference. Finally, three of the aforementioned parameters (atomic size difference, enthalpy of mixing, and Pauling electronegativity difference) were regarded in this study as the crucial rules for the lightweight multicomponent alloys.
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Metadata
Title
A Low-Cost Lightweight Entropic Alloy with High Strength
Authors
Lei Shao
Tao Zhang
Lugee Li
Yuhong Zhao
Jinfeng Huang
Peter K. Liaw
Yong Zhang
Publication date
31-10-2018
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 12/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3720-0

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