Mg-Zn-Zr合金高应变速率多向锻造组织演变及力学性能<sup>*</sup>

doi:10.11901/1005.3093.2013.315

材料研究学报

2014, Vol. 28

Issue (2): 144-152 DOI: 10.11901/1005.3093.2013.315

本期目录 | 过刊浏览

Mg-Zn-Zr合金高应变速率多向锻造组织演变及力学性能^*

吴远志^1,³(

),严红革²,朱素琴²,陈吉华²,刘安民^1,³,刘先兰¹

1. 湖南工学院机械工程学院衡阳 421002
2. 湖南大学材料科学与工程学院长沙 410082
3. 湖南工学院先进制造技术研究所衡阳 421002

Microstructure Evolution and Mechanical Properties of Mg-Zn-Zr Alloys During High Strain Rate Triaxial-Forging

Yuanzhi WU^1,^3,^**(

),Hongge YAN²,Suqin ZHU²,Jihua CHEN²,Anmin LIU^1,³,Xianlan LIU¹

1. Department of Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002
2. School of Materials Science and Engineering, Hunan University, Changsha 410082
3. Institute of Advance Manufacturing Technology, Hunan Institute of Technology, Hengyang 421002

引用本文:

吴远志,严红革,朱素琴,陈吉华,刘安民,刘先兰. Mg-Zn-Zr合金高应变速率多向锻造组织演变及力学性能^*[J]. 材料研究学报, 2014, 28(2): 144-152.
Yuanzhi WU, Hongge YAN, Suqin ZHU, Jihua CHEN, Anmin LIU, Xianlan LIU. Microstructure Evolution and Mechanical Properties of Mg-Zn-Zr Alloys During High Strain Rate Triaxial-Forging[J]. Chinese Journal of Materials Research, 2014, 28(2): 144-152.

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摘要:

对Mg-Zn-Zr合金进行高应变速率多向锻造变形, 研究了其组织演变和力学性能。结果表明, 高应变速率多向锻造工艺能强烈细化合金的晶粒组织, 形成由蜂窝状粗大再结晶组织和岛状细小再结晶组织构成的新颖组织, 初始晶界附近和初始晶粒内部的再结晶机制分别是旋转动态再结晶和孪生诱发动态再结晶。由于高应变速率多向锻造工艺具有强烈的晶粒细化能力并能有效避免强烈的基面织构, 可大幅提高合金的综合力学性能。累积应变∑Δε=2.64时, ZK21和ZK60抗拉强度、屈服强度和延伸率分别为341.6 MPa、270.7 MPa、25.1%和330.2 MPa、232.3 MPa、24.8%。

关键词 ：金属材料, 镁合金, 高应变速率多向锻造, 显微组织, 力学性能

Abstract：

High strain rate triaxial-forging (HSRTF) was successfully conducted on three Mg–Zn–Zr alloys by using a pneumatic power hammer. The microstructure evolution and mechanical properties of the forged alloys were investigated. The results show that HSRTF significantly refined the grains due to dynamic recrystallization (DRX). A novel microstructure was obtained, which was mixed by honeycombe-like coarse DRX grains and island-like ultrafine DRX grains. The two features of the mixed microstructure were caused by different DRX mechanisms, i.e., rotation DRX at the initial grain boundaries and twin-induced DRX in the interior of the initial grains. The mechanical properties were dramatically improved, resulting from the severe grain refinement and weakening of the basal texture due to HSRTF.For ZK21 and ZK60 alloys, after HSRTF with an accumulative strain ∑Δε=2.64, excellent tensile properties were achieved with an ultimate tensile strength, yield strength and elongation of 341.6 MPa, 270.7 MPa, 25.1% and 330.2 MPa, 232.3 MPa, 24.8%, respectively.

Key words： metallic materials magnesium alloys high strain rate triaxial-forging microstructure mechanical properties

收稿日期: 2013-05-14

基金资助:* 国家自然科学基金51274092, 湖南省自然科学基金14JJ6047 和教育部博士点基金20120161110040 资助项目。

作者简介: 本文联系人: 吴远志

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.315 或 https://www.cjmr.org/CN/Y2014/V28/I2/144

表1 Mg-Zn-Zr合金名义成分(质量分数)及初始状态

图1 高应变速率多向锻造及拉伸试样取样示意图

图2 ZK10合金高应变速率多向锻造组织演变

图3 不同累积应变ZK10合金TEM像

图4 ZK21合金高应变速率多向锻造组织演变

图5 不同累积应变ZK21合金TEM像

图6 ZK60合金高应变速率多向锻造组织演变

图7 不同累积应变ZK60合金TEM像

图8 Mg-Zn-Zr合金高应变速率多向锻造组织演变模型

图9 高应变速率多向锻造Mg-Zn-Zr合金室温拉伸曲线

表2 高应变速率多向锻造Mg-Zn-Zr合金不同累积应变时的室温力学性能

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