Phase evolution and strengthening mechanisms in a cast magnesium-zinc-yttrium-zirconium alloy following different heat treatments

Shang Li; Xuanpu Dong; Shuren Guo; Rong Ma; Dong Xiang; Shulin Lü; Xinwang Liu; Huatang Cao

Journal of Materials Research and Technology (Jan 2023)

Phase evolution and strengthening mechanisms in a cast magnesium-zinc-yttrium-zirconium alloy following different heat treatments

Shang Li,
Xuanpu Dong,
Shuren Guo,
Rong Ma,
Dong Xiang,
Shulin Lü,
Xinwang Liu,
Huatang Cao

Affiliations

Shang Li: State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Xuanpu Dong: Corresponding author.; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Shuren Guo: State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Rong Ma: State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Dong Xiang: State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Shulin Lü: State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Xinwang Liu: State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Huatang Cao: Corresponding author.; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

Journal volume & issue: Vol. 22
pp. 3270 – 3279

Abstract

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The phase transformation sequences of a quasicrystal-reinforced magnesium-zinc-yttrium-zirconium (Mg–Zn–Y–Zr, labeled as ZWK3) alloy after annealing, T4, and T6 heat treatments, respectively, were determined by using electron microscopes. Nanoscale Mg7Zn3 phase and I–Mg3YZn6 strengthening particles are the two primary precipitates in the annealed ZWK3 alloy. Substantial nanoscale I-phase particles formed during solidification remained stable during the T4 treatment indicating their high stability at elevated temperatures, while a large number of nanoscale MgZn2 precipitates appeared during the following T6 treatment. There is a clear orientation relationship between the precipitates and the matrix; consequently, these precipitates are supposed to improve the strength of the heat-treated ZWK3 alloys significantly. T6 heat-treated ZWK3 alloy appears to contain thin and slender-like twins and long period stacking ordered (LPSO) structure. T4 and T6 heat treatment enhance the tensile strength of ZWK3 alloy, though with a minor reduction in elongation compared to the as-cast one.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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