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09-07-2021 | Metals & corrosion

Ca-modified Al–Mg–Sc alloy with high strength at elevated temperatures due to a hierarchical microstructure

Authors: Haiquan Du, Shasha Zhang, Bingyi Zhang, Xuewei Tao, Zhengjun Yao, Nikolay Belov, Sybrand van der Zwaag, Zili Liu

Published in: Journal of Materials Science | Issue 28/2021

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Abstract

Al-Mg alloys are normally prone to lose part of their yield and tensile strength at high temperatures due to insufficient thermal stability of the microstructure. Here, we present a Ca-modified Al–Mg–Sc alloy demonstrating high strength at elevated temperatures. The microstructure contains Al₄Ca phases distributed as a network along the grain boundary and Al₃(Sc,Zr) nano-particles dispersed within the grains. The microstructure evolution and age-hardening analysis indicate that the combination of an Al₄Ca network and Sc-rich nano-particles leads to excellent thermal stability even upon aging at 300 °C. The tensile strength of the alloy for temperatures up to 250 °C is significantly improved by an aging treatment and is comparable with the commercial heat-resistant aluminum alloys, i.e., A356 and A319. At a high temperature of 300 °C, the tensile strength is superior to the above-mentioned commercial alloys, even more so when expressed as the specific strength due to the low density of Ca-modified Al–Mg–Sc alloy. The excellent high-temperature strength results from a synergistic effect of solid solution strengthening, grain boundary strengthening and nanoparticle order strengthening.

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Title: Ca-modified Al–Mg–Sc alloy with high strength at elevated temperatures due to a hierarchical microstructure
Authors: Haiquan Du
Shasha Zhang
Bingyi Zhang
Xuewei Tao
Zhengjun Yao
Nikolay Belov
Sybrand van der Zwaag
Zili Liu
Publication date: 09-07-2021
Publisher: Springer US
Published in: Journal of Materials Science / Issue 28/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-021-06310-5

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