Mg-1Gd(Nd)-0.6Zr镁合金的显微组织和力学性能

doi:10.13251/j.issn.0254-6051.2023.10.033

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 215-220.DOI: 10.13251/j.issn.0254-6051.2023.10.033

Mg-1Gd(Nd)-0.6Zr镁合金的显微组织和力学性能

张文玉^1,2, 吴远志^2,3, 叶拓², 杜伟肖⁴, 刘先兰², 赵龙飞², 吴元祯², 全阳²

1.湖南工学院创新创业教育中心, 湖南衡阳 421002;
2.湖南工学院智能制造与机械工程学院, 湖南衡阳 421002;
3.湖南工学院汽车零部件研究院, 湖南衡阳 421002;
4.北京机科国创轻量化科学研究院有限公司, 北京 100083

收稿日期:2023-04-29 修回日期:2023-07-26 出版日期:2023-10-25 发布日期:2023-12-07
通讯作者: 刘先兰,教授,博士,E-mail:407251701@qq.com
作者简介:张文玉(1967—),男,教授,硕士,主要研究方向为高性能有色金属材料、创新创业教育,E-mail: zhangwenyu905@163.com。
基金资助:
国家自然科学基金(52171115);湖南省科技创新计划(2021RC1008);湖南省自然科学基金(2023JJ50109);大学生创新创业训练计划(202311528005,202211528005,S202211528050)

Microstructure and mechanical properties of Mg-1Gd(Nd)-0.6Zr magnesium alloy

Zhang Wenyu^1,2, Wu Yuanzhi^2,3, Ye Tuo², Du Weixiao⁴, Liu Xianlan², Zhao Longfei², Wu Yuanzhen², Quan Yang²

1. Innovation and Entrepreneurship Education Center, Hunan Institute of Technology, Hengyang Hunan 421002, China;
2. School of Intelligent Manufacturing and Mechanical Engineering, Hunan Institute of Technology, Hengyang Hunan 421002, China;
3. Research Institute of Auto Parts Technology, Hunan Institute of Technology, Hengyang Hunan 421002, China;
4. Bejing National Inovation Institute of Lightweight Ltd., Beijing 100083, China

Received:2023-04-29 Revised:2023-07-26 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 采用光学显微镜、扫描电镜、能谱分析、X射线衍射和拉伸试验等方法,研究了Mg-1Gd-0.6Zr和Mg-1Nd-0.6Zr镁合金在铸态、挤压态和时效态的室温组织和力学性能。结果表明,Mg-1Gd-0.6Zr和Mg-1Nd-0.6Zr合金平均晶粒尺寸小于Mg-0.6Zr合金的晶粒尺寸,由300 μm分别细化为100 μm和80 μm左右,晶界上分别有少量的颗粒状Mg₅Gd相和不规则形状的Mg₄₁Nd₅、Mg₁₂Nd相。挤压态Mg-1Gd-0.6Zr和Mg-1Nd-0.6Zr合金出现了变形晶粒和动态再结晶晶粒构成的双峰组织,时效后双峰组织更加明显。时效态Mg-1Nd-0.6Zr合金的力学性能最好,抗拉强度为201.71 Mpa,比挤压态高3.6%,比铸态高23%,比时效态Mg-1Gd-0.6Zr合金高2%。时效态Mg-1Nd-0.6Zr合金的伸长率为29.2%,比挤压态高4.3%,比铸态高46%,比时效态Mg-1Gd-0.6Zr合金高15.4%。

关键词: Mg-1Gd-0.6Zr镁合金, Mg-1Nd-0.6Zr镁合金, 双峰组织, 力学性能

Abstract: Microstructures and mechanical properties of the as-cast, as-extruded and as-aged Mg-1Gd-0.6Zr and Mg-1Nd-0.6Zr magnesium alloys at room temperature were studied by means of optical microscopy, scanning electron microscopy, energy spectrum analysis, X-ray diffraction and tensile test. The results show that the average grain size of the Mg-1Gd-0.6Zr and Mg-1Nd-0.6Zr alloys is smaller than that of the Mg-0.6Zr alloy, which is refined from 300 μm to about 100 μm and 80 μm, respectively. Moreover, a small amount of granular phase Mg₅Gd and irregular shaped Mg₄₁Nd₅ and Mg₁₂Nd phases are distributed at grain boundaries, respectively. The extruded Mg-1Gd-0.6Zr and Mg-1Nd-0.6Zr alloys exhibit typical bimodal microstructure composed of deformed grains and dynamic recrystallized grains, and in particular, the bimodal microstructure is more obvious after aging. The mechanical properties of the as-aged Mg-1Nd-0.6Zr alloy are the best, the tensile strength is 201.71 MPa, which is 3.6% higher than that of the as-extruded alloy, 23% higher than that of the as-cast alloy and 2% higher than that of the as-aged Mg-1Gd-0.6Zr alloy. The elongation of the as-aged Mg-1Nd-0.6Zr alloy is 29.2%, which is 4.3% higher than that of the as-extruded alloy, 46% higher than that of the as-cast alloy and 15.4% higher than that of as-aged Mg-1Gd-0.6Zr alloy.

Key words: Mg-1Gd-0.6Zr magnesium alloy, Mg-1Nd-0.6Zr magnesium alloy, bimodal microstructure, mechanical properties

中图分类号:

TG146.2

张文玉, 吴远志, 叶拓, 杜伟肖, 刘先兰, 赵龙飞, 吴元祯, 全阳. Mg-1Gd(Nd)-0.6Zr镁合金的显微组织和力学性能[J]. 金属热处理, 2023, 48(10): 215-220.

Zhang Wenyu, Wu Yuanzhi, Ye Tuo, Du Weixiao, Liu Xianlan, Zhao Longfei, Wu Yuanzhen, Quan Yang. Microstructure and mechanical properties of Mg-1Gd(Nd)-0.6Zr magnesium alloy[J]. Heat Treatment of Metals, 2023, 48(10): 215-220.

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Mg-1Gd(Nd)-0.6Zr镁合金的显微组织和力学性能

Microstructure and mechanical properties of Mg-1Gd(Nd)-0.6Zr magnesium alloy

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