不同热处理状态Al-Mg-Si合金的热压缩力学行为及微观组织

doi:10.13251/j.issn.0254-6051.2021.02.030

金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 168-172.DOI: 10.13251/j.issn.0254-6051.2021.02.030

不同热处理状态Al-Mg-Si合金的热压缩力学行为及微观组织

刘伟^1,2, 刘巍², 邹文杰², 吴远志^1,2, 邓彬^1,2, 刘安民^1,2, 叶拓^1,2

1.湖南工学院汽车零部件技术研究院, 湖南衡阳 421002;
2.湖南工学院机械工程学院, 湖南衡阳 421002

收稿日期:2020-07-15 出版日期:2021-02-25 发布日期:2021-05-08
通讯作者: 叶拓,副教授,博士,E-mail:hnuyetuo@163.com
作者简介:刘伟(1988—),男,讲师,硕士,主要研究方向为铝合金等轻金属材料高低温变形行为,E-mail:hitliuwei1105@163.com。
基金资助:
全国大学生创新创业训练平台项目(S202011528013);湖南省自然科学基金(2019JJ50110);湖南省教育厅科学研究项目(20B116);衡阳市科技计划(2020jh012668,2019yj011174);湖南工学院大学生创新创业训练计划(CX2020047)

Hot compression mechanical behavior and microstructure of Al-Mg-Si alloy with different heat treatment

Liu Wei^1,2, Liu Wei², Zou Wenjie², Wu Yuanzhi^1,2, Deng Bin^1,2, Liu Anmin^1,2, Ye Tuo^1,2

1. Research Institute of Automobile Parts Technology, Hunan Institute of Technology, Hengyang Hunan 421002, China;
2. School of Mechanical and Engineering, Hunan Institute of Technology, Hengyang Hunan 421002, China

Received:2020-07-15 Online:2021-02-25 Published:2021-05-08

摘要/Abstract

摘要： 利用Gleeble-3500热模拟试验机对不同热处理状态的Al-Mg-Si合金进行了高温压缩试验,研究了变形温度为100~400 ℃和应变速率为0.01 s^-1条件下固溶态和时效态合金的热压缩流变行为。结果表明:合金在压缩变形过程中主要经历了应变硬化和稳态变形两个阶段。流变应力随变形温度的升高而下降,同一变形温度下,时效态合金的流变应力高于固溶态合金的流变应力,随着变形温度的升高,两种状态合金的流变应力差值越来越小。在热变形过程中,合金内部产生了大量的位错组织,时效态合金中由于有弥散分布的析出相钉扎位错,其位错分布更均匀,因而变形抗力更大,随着变形温度升高,位错密度下降,合金在高温条件下软化的主要机制为动态回复。

关键词: Al-Mg-Si合金, 固溶时效, 热压缩, 力学性能, 微观组织

Abstract: High temperature compression test of the Al-Mg-Si alloy with different heat treatment state was carried out by Gleeble-3500 thermal simulation test machine. The hot deformation behavior of the solid solution treated and aged alloy was studied under the condition of deformation temperature of 100-400 ℃ with strain rate of 0.01 s^-1. The results show that the alloy mainly undergoes two stages of strain hardening stage and steady-state deformation stage. The flow stress decreases with the increase of compression temperature, and at the same deformation temperature, the flow stress of aged alloy is higher than that of solid solution treated alloy. With the increase of deformation temperature, the flow stress difference between the solid solution treated and aged alloy becomes smaller and smaller. During the process of deformation, a large number of dislocation structures are produced in the alloy. And because the dispersedly distributed precipitated phase pins dislocation, the dislocation distribution of the aged alloy is more uniform, and the deformation resistance is larger. With the increase of deformation temperature, the dislocation density decreases, and the main mechanism of softening is dynamic recovery.

Key words: Al-Mg-Si alloy, solid solution and aging, hot compression, mechanical properties, microstructure

中图分类号:

TG146.2

刘伟, 刘巍, 邹文杰, 吴远志, 邓彬, 刘安民, 叶拓. 不同热处理状态Al-Mg-Si合金的热压缩力学行为及微观组织[J]. 金属热处理, 2021, 46(2): 168-172.

Liu Wei, Liu Wei, Zou Wenjie, Wu Yuanzhi, Deng Bin, Liu Anmin, Ye Tuo. Hot compression mechanical behavior and microstructure of Al-Mg-Si alloy with different heat treatment[J]. Heat Treatment of Metals, 2021, 46(2): 168-172.

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不同热处理状态Al-Mg-Si合金的热压缩力学行为及微观组织

Hot compression mechanical behavior and microstructure of Al-Mg-Si alloy with different heat treatment

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