预变形对Al-Zn-Mg铝合金组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.03.015

金属热处理 ›› 2021, Vol. 46 ›› Issue (3): 76-79.DOI: 10.13251/j.issn.0254-6051.2021.03.015

预变形对Al-Zn-Mg铝合金组织及力学性能的影响

田敬成¹, 仲维锋¹, 乔玉新¹, 孙艳波^1,2

1.烟台南山学院工学院, 山东烟台 265713;
2.山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心, 山东烟台 265700

收稿日期:2020-11-02 出版日期:2021-03-25 发布日期:2021-05-08
作者简介:田敬成(1978—),男,副教授,硕士,主要研究方向为材料的组织与性能,E-mail:tengdb123@163.com
基金资助:
山东省重点研发计划(2019GGX102025);山东省高等学校青创科技计划(2019KJA019)

Influence of pre-deformation on microstructure and mechanical properties of Al-Zn-Mg aluminum alloy

Tian Jingcheng¹, Zhong Weifeng¹, Qiao Yuxin¹, Sun Yanbo^1,2

1. College of Engineering, Yantai Nanshan University, Yantai Shandong 265713, China;
2. National Engineering Research Center for Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co., Ltd., Yantai Shandong 265700, China

Received:2020-11-02 Online:2021-03-25 Published:2021-05-08

摘要/Abstract

摘要： 系统研究了预变形温度对Al-Zn-Mg铝合金微观组织结构及力学性能的影响。运用光学显微镜和透射电镜观察了微观组织,扫描电镜表征了拉伸断口形貌,X射线衍射仪测试了宏观织构构成,万能拉伸试验机测试了力学性能。结果表明,在400 ℃的热轧温度下,力学性能指标最佳,屈服强度和抗拉强度分别达到325 MPa和455 MPa,伸长率达到14%。不同热轧温度下的拉伸试样断口均呈现为韧性断裂,断口处均存在数量和尺寸不一的韧窝。400 ℃热轧变形温度下,晶粒内部的位错缠结消失,形成了晶界附近规则排列的位错墙;450 ℃时,晶内的位错消失,主要为再结晶晶粒。在350 ℃和400 ℃热轧变形温度下,织构中存在明显的剪切织构,包括旋转立方织构{001}<110>和黄铜R织构{111}<112>和{111}<110>。450 ℃热轧变形温度下,出现明显的再结晶织构Cube_ND {001}<310>。

关键词: Al-Zn-Mg铝合金, 预变形, 织构, 微观组织, 力学性能

Abstract: Influence of pre-deformation temperature on microstructure and mechanical properties of Al-Zn-Mg aluminum alloy was investigated. The microstructure was characterized by using OM and TEM. The fracture morphology was investigated by using SEM. The texture was tested by using XRD tester. The mechanical properties were tested by using tensile testing machine. The results indicate that the optimum mechanical properties are achieved after hot deformation under 400 ℃, the yield strength and tensile strength respectively reaches 325 MPa and 455 MPa, while the elongation after fracture reaches 14%. The fracture morphology shows ductile fracture characteristics, and there are dimples with different numbers and sizes at the fracture surface. The dislocation entanglement inside the grains disappears and the dislocation wall is formed after deformation under 400 ℃. The dislocations inside the grains disappear and the recrystallization grains are formed under 450 ℃. The texture is composed of shear texture under 350 ℃ and 400 ℃, including rotation cube texture{001}<110> and brass R texture{111}<112> and {111}<110>. Obvious recrystallization texture Cube_ND {001}<310> is appeared after deformation under 450 ℃.

Key words: Al-Zn-Mg aluminum alloy, pre-deformation, texture, microstructure, mechanical properties

中图分类号:

TG111.7

田敬成, 仲维锋, 乔玉新, 孙艳波. 预变形对Al-Zn-Mg铝合金组织及力学性能的影响[J]. 金属热处理, 2021, 46(3): 76-79.

Tian Jingcheng, Zhong Weifeng, Qiao Yuxin, Sun Yanbo. Influence of pre-deformation on microstructure and mechanical properties of Al-Zn-Mg aluminum alloy[J]. Heat Treatment of Metals, 2021, 46(3): 76-79.

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预变形对Al-Zn-Mg铝合金组织及力学性能的影响

Influence of pre-deformation on microstructure and mechanical properties of Al-Zn-Mg aluminum alloy

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