Plastic deformation mechanism of Mg-Gd-Y-(Sm)-Zr alloys at room and cryogenic temperature

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-09-11 DOI:10.1007/s12598-024-02987-0

Yan-Bo Pei, En-Bo Wei, Meng-Jia Yao, Meng-Hua Yu, Mao-Sheng Zhao, Bu-Gang Teng

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Abstract

In this study, Mg-Gd-Y-(Sm)-Zr (GW-(Sm)) alloys were subjected to compression tests at both 293 and 77 K. The effect of Sm addition on the plastic deformation mechanism of Mg-Gd-Y-Zr (GW) alloy was investigated, and a detailed analysis was conducted on the relationships between mechanical responses and the microstructure of the alloys. The findings suggest that dislocation slip plays a predominant role in the plastic deformation of GW-(Sm) alloys. The addition of Sm reduces the stacking fault energy (SFE) of the alloy, which promotes < c + a > slip and inhibits twinning. Meanwhile, Sm plays a role in solution strengthening, causing an elevation in the flow stress of the alloy. At cryogenic temperature (CT), the critical resolved shear stress (CRSS) of dislocation slip is increased, so the dislocation motion requires greater external force. In addition, the extensive crossed twins exhibited in the microstructure, which shorten the dislocation slip path and enhance the grain boundary strengthening. This research contributes to the advancement of plastic deformation theories for magnesium-rare earth (Mg-RE) alloys.

Graphical abstract

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室温和低温下 Mg-Gd-Y-(Sm)-Zr 合金的塑性变形机理

摘要本研究对 Mg-Gd-Y-(Sm)-Zr (GW-(Sm)) 合金在 293 和 77 K 条件下进行了压缩试验，研究了添加 Sm 对 Mg-Gd-Y-Zr (GW) 合金塑性变形机制的影响，并详细分析了合金的力学响应与微观结构之间的关系。研究结果表明，位错滑移在 GW-（Sm）合金的塑性变形中起着主导作用。Sm的加入降低了合金的堆叠断层能（SFE），从而促进了< c + a >滑移并抑制了孪晶。同时，Sm 在溶液强化中发挥作用，导致合金的流动应力升高。在低温（CT）条件下，位错滑移的临界分辨剪切应力（CRSS）增加，因此位错运动需要更大的外力。此外，微观结构中出现的大量交叉孪晶缩短了位错滑移路径，增强了晶界强化。该研究有助于推动镁稀土（Mg-RE）合金塑性变形理论的发展。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.