双级固溶工艺对7050铝合金组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.03.020

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 102-106.DOI: 10.13251/j.issn.0254-6051.2022.03.020

双级固溶工艺对7050铝合金组织与力学性能的影响

姜中涛¹, 汪鑫², 周志明², 林海涛³, 杨绪盛¹, 代芳芳³

1.重庆文理学院新材料技术研究院, 重庆 402160;
2.重庆理工大学材料科学与工程学院, 重庆 400054;
3.西南铝业(集团)有限责任公司, 重庆 401326

收稿日期:2021-11-11 修回日期:2022-01-13 出版日期:2022-03-25 发布日期:2022-04-22
作者简介:姜中涛(1984—),男,副教授,博士,主要研究方向为轻合金材料设计与组织性能,E-mail:jiangtao6364@163.com
基金资助:
重庆市技术创新与应用发展重点专项(CSTC2019jscx-mbdxX0025)

Effect of two-step solution process on microstructure and mechanical properties of 7050 aluminum alloy

Jiang Zhongtao¹, Wang Xin², Zhou Zhiming², Lin Haitao³, Yang Xusheng¹, Dai Fangfang³

1. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China;
2. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
3. Southwest Aluminum (Group) Co., Ltd., Chongqing 401326, China

Received:2021-11-11 Revised:2022-01-13 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 采用SEM分析、导电率测试、室温拉伸性能测试等方法,研究了双级固溶工艺对7050铝合金组织演变,以及对双级时效后析出相特征与力学性能的影响。结果表明,与单级固溶处理相比,双级固溶可使难溶的Al₂CuMg相完全固溶,显著增加晶内时效析出相的数量,晶界析出相断续分布。双级固溶处理显著提高了7050铝合金的拉伸强度和导电率,同时保持较好的伸长率,抗拉强度达到611.9 MPa,屈服强度达到587.5 MPa,导电率为42.43%IACS,而伸长率为13.5%。

关键词: 7050铝合金, 强化固溶, 双级时效, 组织, 力学性能

Abstract: Effect of two-step solution process on microstructure evolution of the 7050 aluminum alloy and precipitate characteristics and mechanical properties after two-step aging was tudied by means of SEM analysis, electrical conductivity testing and room temperature tensile performance testing. The results show that compared with the single stage solution, two-step solution can completely dissolve the insoluble Al₂CuMg phase, significantly increase the number of aging precipitates within grains, and the precipitates on the grain boundary are distributed intermittently. The two-step solution treatment significantly increases tensile strength and conductivity of the 7050 aluminum alloy while maintaining better elongation, with 611.9 MPa of the tensile strength, 587.5 MPa of the yield strength, 42.43%IACS of the electrical conductivity, and 13.5% of the elongation.

Key words: 7050 aluminum alloy, enhanced solution, two-step aging, microstructure, mechanical properties

中图分类号:

TG113.1

姜中涛, 汪鑫, 周志明, 林海涛, 杨绪盛, 代芳芳. 双级固溶工艺对7050铝合金组织与力学性能的影响[J]. 金属热处理, 2022, 47(3): 102-106.

Jiang Zhongtao, Wang Xin, Zhou Zhiming, Lin Haitao, Yang Xusheng, Dai Fangfang. Effect of two-step solution process on microstructure and mechanical properties of 7050 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(3): 102-106.

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双级固溶工艺对7050铝合金组织与力学性能的影响

Effect of two-step solution process on microstructure and mechanical properties of 7050 aluminum alloy

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