热处理对Mg-6Sn-3Zn-xAl合金微观组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.11.039

金属热处理 ›› 2024, Vol. 49 ›› Issue (11): 256-261.DOI: 10.13251/j.issn.0254-6051.2024.11.039

热处理对Mg-6Sn-3Zn-xAl合金微观组织和力学性能的影响

杜佳贝, 张扬, 卢雅琳

江苏理工学院材料工程学院,江苏常州 213001

收稿日期:2024-05-27 修回日期:2024-09-19 出版日期:2024-11-25 发布日期:2025-01-09
通讯作者: 张扬,副教授,博士,E-mail:zhangyang@jsut.edu.cn
作者简介:杜佳贝(1999—),女,硕士研究生,主要研究方向为镁合金制备及成形工艺,E-mail:15637923187@163.com。
基金资助:
中国博士后科学基金面上项目(2019M650096);江苏省高等学校基础科学(自然科学)重大项目(21KJA430009);常州市科技支撑计划(社会发展)(CE20235041);江苏省研究生高校创新计划(XSJCX22-02)

Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl alloys

Du Jiabei, Zhang Yang, Lu Yalin

School of Materials Engineering, Jiangsu University of Technology, Changzhou Jiangsu 213001, China

Received:2024-05-27 Revised:2024-09-19 Online:2024-11-25 Published:2025-01-09

摘要/Abstract

摘要： 利用XRD、OM、SEM、硬度测试和拉伸试验等方法,研究了热处理对不同Al含量Mg-6Sn-3Zn-xAl(x=0、1、2、3)合金微观组织和力学性能的影响规律。结果表明,铸态Mg-6Sn-3Zn合金由α-Mg等轴枝晶和Mg₂Sn相组成,Al元素的加入使得铸态合金的晶粒细化,同时在合金中形成了Mg_x(ZnAl)_1-x准晶相。经320 ℃×3 h＋430 ℃×24 h固溶处理后,Mg-6Sn-3Zn-xAl合金中的Mg_x(ZnAl)_1-x准晶相完全溶解,Mg₂Sn相大部分溶解但有少量残留。时效硬化曲线表明,在200 ℃时效过程中,Mg-6Sn-3Zn-xAl合金均在216 h达到峰时效,峰时效合金中析出大量弥散分布的Mg₂Sn相。Al元素的加入带来的一定的强化作用,而固溶和时效处理均在一定程度上提升了合金的力学性能。合金力学性能的改善分别来自于细晶强化、固溶强化和沉淀强化的贡献。

关键词: Mg-6Sn-3Zn-xAl合金, 热处理, 微观组织, 力学性能

Abstract: Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl (x=0, 1, 2, 3) alloys with different Al contents was studied by using XRD, OM, SEM, hardness test and tensile test. The results indicate that the as-cast Mg-6Sn-3Zn alloy is composed of α-Mg equiaxed dendrites and Mg₂Sn phase. The addition of Al element causes grain refinement of the as-cast alloy, and the Mg_x(ZnAl)_1-x quasicrystal phase is formed in the alloy. After 320 ℃×3 h+430 ℃×24 h solution treatment, the Mg_x(ZnAl)_1-x quasicrystal phase in the Mg-6Sn-3Zn-xAl alloy is completely dissolved, while the Mg₂Sn phase is mostly dissolved but has a small amount of residue. The aging hardening curve shows that during the aging process at 200 ℃, the Mg-6Sn-3Zn-xAl alloys all reach peak when aged for 216 h, and a large number of dispersed Mg₂Sn phases are precipitated in the peak aged alloy. The addition of Al element brings a certain strengthening effect, and both solution treatment and aging treatment improve the mechanical properties of the alloy to a certain extent. The improvement of mechanical properties of the alloy comes from the contribution of refined crystalline strengthening, solution strengthening and precipitation strengthening, respectively.

Key words: Mg-6Sn-3Zn-xAl alloy, heat treatment, microstructure, mechanical properties

中图分类号:

TG146.22

杜佳贝, 张扬, 卢雅琳. 热处理对Mg-6Sn-3Zn-xAl合金微观组织和力学性能的影响[J]. 金属热处理, 2024, 49(11): 256-261.

Du Jiabei, Zhang Yang, Lu Yalin. Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl alloys[J]. Heat Treatment of Metals, 2024, 49(11): 256-261.

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热处理对Mg-6Sn-3Zn-xAl合金微观组织和力学性能的影响

Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl alloys

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