预孪生纯镁及AZ80镁合金退火过程力学性能演变及其机制

doi:10.13251/j.issn.0254-6051.2022.05.010

金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 65-70.DOI: 10.13251/j.issn.0254-6051.2022.05.010

预孪生纯镁及AZ80镁合金退火过程力学性能演变及其机制

何杰军¹, 吴鲁淑²

1.贵州理工学院材料与能源工程学院, 贵州贵阳 550003;
2.贵州理工学院机械工程学院, 贵州贵阳 550003

收稿日期:2021-12-27 修回日期:2022-03-10 出版日期:2022-05-25 发布日期:2022-06-16
作者简介:何杰军(1982—),男,副教授,博士,主要研究方向为材料的塑性变形及加工,E-mail: hejiejungz@126.com
基金资助:
国家自然科学基金(51501045);贵州省科学技术基金([2019]1141)

Evolution of mechanical properties and its mechanisms of pre-twinned pure magnesium and AZ80 magnesium alloy during annealing

He Jiejun¹, Wu Lushu²

1. School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang Guizhou 550003, China;
2. School of Mechanical Engineering, Guizhou Institute of Technology, Guiyang Guizhou 550003, China

Received:2021-12-27 Revised:2022-03-10 Online:2022-05-25 Published:2022-06-16

摘要/Abstract

摘要： 对同一加工工艺得到的挤压态纯镁和AZ80镁合金分别进行6%预压缩,之后对无预压缩和预压缩试样在180 ℃退火20 h,采用光学显微镜、扫描电镜和透射电镜及压缩试验机等对其组织和强度进行了观察和测定,以研究预孪生纯镁及AZ80镁合金退火过程的性能演变及其机制。结果表明:6%预压缩纯镁经180 ℃退火20 h后,屈服强度较未退火试样降低,不存在退火硬化效应。无预压缩AZ80镁合金直接退火处理后,屈服强度与退火处理前几乎不变;而6%预压缩AZ80镁合金经180 ℃退火20 h后,因组织中有较多的白色第二相颗粒在孪晶和孪晶界析出,阻碍位错的运动和孪晶扩展,屈服强度较退火前提高了20 MPa,出现了明显的退火强化效应。

关键词: 纯镁, AZ80镁合金, 退火强化, 第二相粒子

Abstract: Extruded pure magnesium and AZ80 magnesium alloy prepared by the same process were pre-compressed by 6% respectively, then the specimens with and without pre-compressing were annealed at 180 ℃ for 20 h. The microstructure and mechanical properties were characterized by using optical microscope, scanning electron microscope, transmission electron microscope and compressive test machin, by which the evolution of mechanical properties during annealing and its mechanisms were investigated for the pre-twinned pure magnesium and AZ80 alloy. The results show that the yield strength of the 6% pre-compressed pure magnesium annealed at 180 ℃ for 20 h is lower than that of the unannealed, which indicates that no annealing hardening occurs in the pure magnesium. The yield strength of the AZ80 alloy without pre-compressing annealed at 180 ℃ for 20 h is nearly equal to that of the AZ80 alloy before annealing. However, the yield strength of the 6% pre-compressed AZ80 alloy annealed at 180 ℃ for 20 h is 20 MPa higher than that before annealing, which is resulted from a great deal of white second-phase particles precipitated in the twins and at the twin boundary that prevent dislocation gliding and twin expanding. Thus, the 6% pre-compressed AZ80 alloy has obvious annealing strengthening effect.

Key words: pure magnesium, AZ80 magnesium alloy, annealing strengthening, second-phase particles

中图分类号:

TG146.2

何杰军, 吴鲁淑. 预孪生纯镁及AZ80镁合金退火过程力学性能演变及其机制[J]. 金属热处理, 2022, 47(5): 65-70.

He Jiejun, Wu Lushu. Evolution of mechanical properties and its mechanisms of pre-twinned pure magnesium and AZ80 magnesium alloy during annealing[J]. Heat Treatment of Metals, 2022, 47(5): 65-70.

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预孪生纯镁及AZ80镁合金退火过程力学性能演变及其机制

Evolution of mechanical properties and its mechanisms of pre-twinned pure magnesium and AZ80 magnesium alloy during annealing

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