复合添加Cr、Mn、Zr对Al-Zn-Mg合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2020.04.006

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 29-33.DOI: 10.13251/j.issn.0254-6051.2020.04.006

复合添加Cr、Mn、Zr对Al-Zn-Mg合金组织和性能的影响

邓科^1,2, 孙大翔^1,2,3, 唐维学², 万里³, 蔡知之³, 周思根³

1. 中南大学材料科学与工程学院, 湖南长沙 410083;
2. 广东省工业分析检测中心, 广东广州 510650;
3. 广东凤铝铝业有限公司, 广东佛山 528133

收稿日期:2019-09-22 出版日期:2020-04-25 发布日期:2020-05-08
通讯作者: 孙大翔,博士后,E-mail:18802081724@163.com
作者简介:邓科(1994—),男,硕士研究生,主要从事Al-Zn-Mg合金微合金化及挤压工艺研究,E-mail:981944896@qq.com
基金资助:
广东省自然科学基金(2018A030310417);广东省科学院发展专项资金(2018GDASCX-0114)

Effects of Zr, Mn and Cr addition on microstructure and properties of Al-Zn-Mg alloy

Deng Ke^1,2, Sun Daxiang^1,2,3, Tang Weixue², Wan Li³, Cai Zhizhi³, Zhou Sigen³

1. School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China;
2. Guangdong Industry Analysis and Testing Center, Guangzhou Guangdong 510650, China;
3. Guangdong Fenglu Alumina Company Ltd., Foshan Guangdong 528133, China

Received:2019-09-22 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜、透射电镜观察以及拉伸试验等手段,研究Cr、Mn、Zr微合金元素对Al-Zn-Mg合金组织和性能的影响。结果表明:复合添加Zr、Mn、Cr在基体上析出大量不规则的、直径为10~20 nm与基体共格的(Al,Cr)₃Zr粒子。(Al,Cr)₃Zr粒子弥散相能强烈钉扎位错、阻碍位错和亚晶界迁移,显著抑制再结晶和晶粒长大。复合添加Zr、Mn、Cr的Al-Zn-Mg合金的抗拉强度和规定塑性延伸强度分别提高34 MPa、19 MPa,具有较好的加工性能和力学性能。

关键词: Al-Zn-Mg合金, 微量元素, 微观组织, 细化晶粒, 力学性能

Abstract: Effects of Zr, Mn and Cr additions on microstructure and properties of Al-Zn-Mg alloy were investigated by means of optical microscopy, scanning electron microscopy, transmission electron microscopy and tensile test. The results show that the combined addition of Zr, Mn and Cr in the Al-Zn-Mg alloys leads to precipitates of a large number of (Al,Cr)₃Zr particles with 10-20 nm size, which coherent with the matrix. These irregularity dispersoids can strongly pin the dislocation, and hinder the dislocation movement and subgrain boundary migration and significantly inhibit grain recrystallization and growth of subgrain. The tensile strength and yield strength of Al-Zn-Mg alloy added with Zr, Mn and Cr are increased by 34 MPa and 19 MPa, respectively, which has better processability and mechanical properties.

Key words: Al-Zn-Mg alloy, trace element, microstructure, grain refinement, mechanical properties

中图分类号:

TG146.2⁺1

邓科, 孙大翔, 唐维学, 万里, 蔡知之, 周思根. 复合添加Cr、Mn、Zr对Al-Zn-Mg合金组织和性能的影响[J]. 金属热处理, 2020, 45(4): 29-33.

Deng Ke, Sun Daxiang, Tang Weixue, Wan Li, Cai Zhizhi, Zhou Sigen. Effects of Zr, Mn and Cr addition on microstructure and properties of Al-Zn-Mg alloy[J]. Heat Treatment of Metals, 2020, 45(4): 29-33.

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复合添加Cr、Mn、Zr对Al-Zn-Mg合金组织和性能的影响

Effects of Zr, Mn and Cr addition on microstructure and properties of Al-Zn-Mg alloy

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