Mg-4.3Li-1.08Y-5.83Zn合金的微观组织与塑性不稳定性研究

doi:10.3969/j.issn.1000-1093.2017.03.016

兵工学报 ›› 2017, Vol. 38 ›› Issue (3): 534-539.doi: 10.3969/j.issn.1000-1093.2017.03.016

Mg-4.3Li-1.08Y-5.83Zn合金的微观组织与塑性不稳定性研究

沙桂英¹，尹淼¹，韩恩厚²，许道奎²，徐永波²，于爽¹

(1.沈阳航空航天大学材料科学与工程学院，辽宁沈阳 110136; 2.中国科学院金属研究所材料环境腐蚀研究中心，辽宁沈阳 110016)

收稿日期:2016-05-05 修回日期:2016-05-05 上线日期:2017-04-24
作者简介:沙桂英（1963—），女，教授，硕士生导师。E-mail:guiysha@sina.com
基金资助:
国家自然科学基金项目（51271183、51301172）；辽宁省自然科学基金项目（2013024007）

Microstructure and Plastic Instability of Mg-4.3Li-1.08Y-5.83Zn Alloy

SHA Gui-ying¹， YIN Miao¹， HAN En-hou ²， XU Dao-kui²， XU Yong-bo²， YU Shuang¹

（1.School of Materials Science and Engineering，Shenyang Aerospace University，Shenyang 110136， Liaoning，China；2.Environmental Corrosion Research Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016， Liaoning，China）

Received:2016-05-05 Revised:2016-05-05 Online:2017-04-24

摘要/Abstract

摘要： 采用常压铸造及热挤压方法制备Mg-4.3Li-1.08Y-5.83Zn变形合金，通过光学显微镜、扫面电子显微镜、能谱和X射线衍射分析以及拉伸实验，研究合金的微观组织和变形行为及其力学性能变化。研究结果表明：Mg-4.3Li-1.08Y-5.83Zn合金的微观组织中形成了I-Mg₃YZn₆准晶相和W-Mg₃Y₂Zn₃及Mg_0.97Zn_0.03第2相，从而使合金的屈服强度和抗拉强度大幅度提高；在1×10^-5~1×10^-2 s^-1应变率范围内，该合金产生了明显的塑性不稳定行为，随着应变率提高，动态应变时效机制主导的塑性不稳定性是使合金的屈服强度和抗拉强度表现为负的应变率敏感性的根本原因。

关键词: 金属材料, Mg-Li-Y-Zn合金, 准晶, 应变率, 塑性不稳定性

Abstract: Mg-4.3Li-1.08Y-5.83Zn deforming alloy is prepared using conventional casting and hot extrusion processing. The microstructure, deformation behavior and mechanical properties of the alloy are investigated by optical microscope, scanning electron microscope, energy density spectrum and X-ray diffraction analyses, and tensile tests. The results show that the quasi-crystalline phase I-Mg₃YZn₆, and the secondary phase W-Mg₃Y₂Zn₃ and Mg_0.97Zn_0.03 are generated in the microstructure of Mg-4.3Li-1.08Y-5.83Zn alloy, thus enhancing the yield strength and ultimate tensile strength significantly. The tensile tests at different strain rates show that the plastic instability occurs in the strain rate range from 1×10^-5 s^-1 to 1×10^-2 s^-1 and the yield and ultimate strengths of the alloy exhibit negative strain rate sensitivity with the increase in strain rate. A reasonable mechanism for this is attributed to the dynamic strain aging (DSA) occurring during tensile deformation. Key

Key words: metallicmaterial, Mg-Li-Y-Znalloy, quasi-crystal, strainrate, plasticinstability

中图分类号:

TG146.22

沙桂英，尹淼，韩恩厚，许道奎，徐永波，于爽. Mg-4.3Li-1.08Y-5.83Zn合金的微观组织与塑性不稳定性研究[J]. 兵工学报, 2017, 38(3): 534-539.

SHA Gui-ying， YIN Miao， HAN En-hou ， XU Dao-kui， XU Yong-bo， YU Shuang. Microstructure and Plastic Instability of Mg-4.3Li-1.08Y-5.83Zn Alloy[J]. Acta Armamentarii, 2017, 38(3): 534-539.

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Mg-4.3Li-1.08Y-5.83Zn合金的微观组织与塑性不稳定性研究

Microstructure and Plastic Instability of Mg-4.3Li-1.08Y-5.83Zn Alloy

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