Mg含量对2A14铝合金组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.04.014

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 86-92.DOI: 10.13251/j.issn.0254-6051.2022.04.014

Mg含量对2A14铝合金组织和力学性能的影响

陈思君^1,2, 陈送义^1,2, 陈庚^1,2, 袁丁玲^1,2, 陈康华^1,2,3

1.中南大学轻合金研究院, 湖南长沙 410083;
2.中南大学有色金属先进结构材料与制造协同创新中心, 湖南长沙 410083;
3.中南大学轻质高强结构材料重点实验室, 湖南长沙 410083

收稿日期:2021-12-24 修回日期:2022-01-27 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 陈康华,教授,博士生导师,E-mail:chenkanghua@csu.edu.cn
作者简介:陈思君(1996—),男,硕士研究生,主要研究方向为2A14铝合金的组织和性能,E-mail:1228807527@qq.com。
基金资助:
国家重点研发计划(2016YFB0300801);国防科技重点实验室稳定支持项目(20190104)

Effect of Mg content on microstructure and mechanical properties of 2A14 aluminum alloy

Chen Sijun ^1,2, Chen Songyi^1,2, Chen Geng^1,2, Yuan Dingling^1,2, Chen Kanghua^1,2,3

1. Light Alloy Research Institute, Central South University, Changsha Hunan 410083, China;
2. Collaborative Innovation Center of Advanced Nonferrous Structural Materials and Manufacturing, Central South University, Changsha Hunan 410083, China;
3. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha Hunan 410083, China

Received:2021-12-24 Revised:2022-01-27 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 借助光学显微镜(OM)、扫描电镜(SEM)、维氏硬度计、拉伸和冲击试验机等测试设备研究了不同Mg含量对2A14铝合金显微组织和力学性能的影响。结果表明,随着Mg含量的增加,时效态合金基体中剩余结晶相明显增多,强度先增加后降低,而强度最高时冲击性能略有降低。Mg含量的增加会促进Cu-Mg团簇的形成,为后续θ′和Q′相提供形核位点,使其数量显著增加,强度随之提高,但过多的Mg会使基体中剩余结晶相(Al₂Cu、AlCuMgSi、AlSiMnFe等)显著增加,造成应力集中,降低冲击性能和拉伸性能。

关键词: Mg含量, 剩余结晶相, 时效析出相, 拉伸性能, 冲击性能

Abstract: Effect of different Mg contents on microstructure and mechanical properties of 2A14 aluminum alloy were studied by means of optical microscope (OM), scanning electron microscopy (SEM), hardness tester, tensile tester and impact tester. The results show that with the increase of Mg content, the residual crystalline phase in the aged alloy increases obviously, the strength increases first and then decreases, and the impact property decreases slightly when the strength is the highest. The increase of Mg content promotes the formation of Cu-Mg clusters, which provides nucleation sites for subsequent θ′ and Q′ phases, so that the number of θ′ and Q′ increases significantly and the strength increases accordingly. However, excessive Mg content significantly increases the residual crystalline phases (Al₂Cu, AlCuMgSi, AlSiMnFe, etc), resulting in stress concentration, which reduces impact property and tensile properties.

Key words: Mg content, residual crystalline phase, aging precipitates, tensile properties, impact property

中图分类号:

TG146

陈思君, 陈送义, 陈庚, 袁丁玲, 陈康华. Mg含量对2A14铝合金组织和力学性能的影响[J]. 金属热处理, 2022, 47(4): 86-92.

Chen Sijun , Chen Songyi, Chen Geng, Yuan Dingling, Chen Kanghua. Effect of Mg content on microstructure and mechanical properties of 2A14 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(4): 86-92.

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Mg含量对2A14铝合金组织和力学性能的影响

Effect of Mg content on microstructure and mechanical properties of 2A14 aluminum alloy

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