不同处理态Al-Mg-Si铝合金的组织性能

doi:10.13251/j.issn.0254-6051.2020.02.010

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 51-55.DOI: 10.13251/j.issn.0254-6051.2020.02.010

不同处理态Al-Mg-Si铝合金的组织性能

张贵钊¹, 姜锋^1,2,3, 周巍³, 王琮凯¹, 叶鹏程¹

1. 中南大学材料科学与工程学院, 湖南长沙 410083;
2. 轻质高强结构材料重点实验室, 湖南长沙 410083;
3. 中南大学轻合金研究院, 湖南长沙 410083

收稿日期:2019-08-26 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 姜锋,教授,博士,联系电话:13787009528,E-mail:jfeng@csu.edu.cn
作者简介:张贵钊(1993—),男,硕士研究生,主要研究方向为6×××系铝合金的切削性能,E-mail:691697986@qq.com。
基金资助:
广东省科研计划重大项目(2016B090931004)

Microstructure and properties of Al-Mg-Si aluminum alloy with different treatments

Zhang Guizhao¹, Jiang Feng^1,2,3, Zhou Wei³, Wang Congkai¹, Ye Pengcheng¹

1. School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China;
2. Science and Technology on High Strength Structural Materials Laboratory, Changsha Hunan 410083, China;
3. Light Alloy Research Institute, Central South University, Changsha Hunan 410083, China

Received:2019-08-26 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

采用扫描电镜、透射电镜、能谱分析和拉伸测试等手段,研究了热处理对Y、Zr微合金化Al-Mg-Si铝合金显微组织和力学性能的影响。结果表明:添加Y、Zr有助于细化合金铸态晶粒,合金铸态组织在晶界处有明显的偏析,经535 ℃×14 h均匀化处理后偏析现象得到改善。合金经热挤压后,沿挤压方向分布着大量的第二相,随着固溶温度的增加,第二相逐渐溶解在铝基体中。时效处理后,合金中弥散分布着大量的β″相以及其他细小的析出相,起到第二相强化的作用。合金经530 ℃×2 h固溶+180 ℃×8 h时效热处理后的力学性能最佳,抗拉强度达408 MPa,伸长率为14.8%。

关键词: Al-Mg-Si铝合金, 显微组织, 力学性能, 均匀化, 固溶处理, 时效处理

Abstract:

Effect of heat treatment on the microstructure and mechanical properties of Al-Mg-Si aluminum alloy microalloying with Y and Zr was investigated by means of scanning electron microscopy, transmission electron microscopy, energy spectrum analysis and tensile test. The results show that the addition of Y and Zr can help to refine the grains of as-cast the alloy. The microstructure of the as-cast alloy has obvious segregation at the grain boundary. The segregation is improved after homogenization treatment at 535 ℃ for 14 h. There exist lots of second phases along the extrusion direction after hot extrusion. Increasing solution temperature, the second phases are dissolved into the aluminum matrix gradually. After aging treatment, a multitude of β″ phases and other fine precipitates are dispersed in the alloy and have a precipitation strengthening effect. The alloy has the best mechanical properties after solution treatment at 530 ℃ for 2 h and aging treatment at 180 ℃ for 8 h, by which the tensile strength is 408 MPa and the elongation is 14.8%.

Key words: Al-Mg-Si aluminum alloy, microstructure, mechanical properties, homogenization, solution treatment, aging treatment

中图分类号:

TG146.2

张贵钊, 姜锋, 周巍, 王琮凯, 叶鹏程. 不同处理态Al-Mg-Si铝合金的组织性能[J]. 金属热处理, 2020, 45(2): 51-55.

Zhang Guizhao, Jiang Feng, Zhou Wei, Wang Congkai, Ye Pengcheng. Microstructure and properties of Al-Mg-Si aluminum alloy with different treatments[J]. HTM, 2020, 45(2): 51-55.

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不同处理态Al-Mg-Si铝合金的组织性能

Microstructure and properties of Al-Mg-Si aluminum alloy with different treatments

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