Microstructure evolution and mechanical properties of the Mg-9.5Gd-4Y-2Zn-0.5Zr alloy wire during the multi-pass drawing

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-08-06 DOI:10.1016/j.jallcom.2025.182845

Wenzhuo Xie, Minmin Fu, Hai Su, Songhui Wang, Wenke Wang, Wenzhen Chen, Wenxue Zhang, Wencong Zhang

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引用次数: 0

Abstract

This work focuses on the microstructure evolution and mechanical properties of the Mg-9.5Gd-4Y-2Zn-0.5Zr alloy wire during the multi-pass drawing at 300℃. Results showed that the deformed grains were elongated and concurrently some clusters of ultra-fine dynamically recrystallized (DRXed) grains appeared owing to the combined effects of the low temperature and cumulative strain. These ultra-fine DRXed grain boundaries combined with some subgrain boundaries in deformed grains provided abundant precipitation sites, promoting dynamic precipitation of Mg₅RE phases under sufficient cumulative strain. Such severe strain also made the LPSO phases fracture along DD (drawing direction) and contract along TD (transverse direction). In addition, the activation of basal slip rotated the basal plane to the DD, and under the extra axisymmetric strain effect, the basal plane spread along the TD. Subsequently, the prismatic slips were forced to be activated and rotated the <10-10> crystal direction to DD, eventually developing one <10-10>//DD texture. This variation in texture enhanced the grain boundary hardening effect. According to the quantitative analysis of the hardening mechanism, the combined effect of the grain boundary hardening and dynamically precipitated Mg₅RE phases mainly increased the Vickers hardness with the strain cumulating, which resulted in the hardness increasing to 132HV from 113HV when the wire diameter reduced to 2.5 mm during the multi-pass drawing.

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Mg-9.5Gd-4Y-2Zn-0.5Zr合金丝在多道次拉丝过程中的组织演变及力学性能

研究了Mg-9.5Gd-4Y-2Zn-0.5Zr合金丝在300℃多道次拉丝过程中的组织演变和力学性能。结果表明：在低温和累积应变的共同作用下，变形晶粒被拉长，同时出现超细动态再结晶（DRXed）晶粒团簇；这些超细DRXed晶界与变形晶粒中的亚晶界结合，提供了丰富的析出位点，在足够的累积应变下促进Mg5RE相的动态析出。如此大的应变也使得LPSO相沿DD（拉伸方向）断裂，沿TD（横向）收缩。此外，基底滑移的激活使基底面向基底方向旋转，在额外轴对称应变作用下，基底面沿基底向基底方向扩展。随后，强制激活棱柱卡瓦并旋转<；10-10>；晶向DD方向转变，最终形成一种<；10-10>；//DD织构。这种织构变化增强了晶界硬化效果。根据硬化机理的定量分析，晶界硬化与动态析出Mg5RE相的共同作用主要是随着应变的积累，使合金的维氏硬度提高，在多道次拉丝过程中，当线材直径减小到2.5 mm时，合金的硬度从113HV提高到132HV。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.