High-strain-rate superplasticity and microstructural evolution in ECAP-processed Mg-6.5Y-1.2Er-1.6Zn-0.5Ag alloy

被引：11
作者：
Wu, Haoran [1 ]
Jiang, Jinghua [1 ,2 ]
Yang, Zhenquan [1 ]
Li, Mengjia [3 ]
Yuan, Yuxuan [1 ]
Ma, Aibin [1 ,2 ]
机构：
[1] Hohai Univ, Coll Mech & Mat, Nanjing 210000, Peoples R China
[2] Hohai Univ, Suqian Inst, Suqian 223800, Peoples R China
[3] Zhengzhou Univ, Ctr Adv Anal & Gene Sequencing, Zhengzhou 450003, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2023年 / 23卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloy; Superplasticity; Long-period stacking ordered phase; Equal-channel angular pressing; Texture; Grain boundary sliding; Y-ZR ALLOY; MECHANICAL-PROPERTIES; MG; TEXTURE; DUCTILITY; STRENGTH; BEHAVIOR;
D O I：
10.1016/j.jmrt.2023.02.092
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A warm equal-channel angular pressing (ECAP) procedure was applied to a new Mg-6.5Y-1.2Er-1.6Zn (WEZ612)-0.5Ag alloy with a long-period stacking ordered (LPSO) phase. The microstructure, superplasticity, and deformation mechanism of the WEZ612-0.5Ag alloy were then systematically investigated. Three different precipitation phases formed in the alloy with trace Ag addition, namely LPSO, g, and nanoprecipitate phases. A remarkable elongation of 726% was attained at 623 K and a strain rate of 0.01 s-1. The strain rate sensitivity index (m) and activation energy (Q) under these deformation conditions were 0.461 and 133.08 kJ mol-1, respectively. These m and Q values confirm that the primary deformation mechanism of the WEZ612-0.5Ag alloy at 623 K was grain boundary sliding assisted by lattice diffusion. The highly stable LPSO phases, g precipitates, and nano -precipitates synergistically improved the superplasticity of the alloy by retarding crack propagation and grain growth and by promoting the basal plane slip. (c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码：4790 / 4801
页数：12
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