RRA过程中预时效时间对7A85铝合金组织性能的影响

doi:10.13251/j.issn.0254-6051.2022.03.008

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 44-47.DOI: 10.13251/j.issn.0254-6051.2022.03.008

RRA过程中预时效时间对7A85铝合金组织性能的影响

杨春苗¹, 王珊¹, 王淑慧^1,2, 李延珍³, 刘文文^1,2

1.烟台南山学院工学院, 山东烟台 265713;
2.烟台南山学院轻合金加工成形实验室, 山东烟台 265700;
3.航鑫材料科技有限公司, 山东烟台 265700

收稿日期:2021-10-24 修回日期:2021-01-04 出版日期:2022-03-25 发布日期:2022-04-22
通讯作者: 刘文文,讲师,硕士,E-mail:liuwenwen@nanshan.edu.cn
作者简介:杨春苗(1982—),女,讲师,硕士,主要研究方向为金属材料的性能优化,E-mail: yangchunmiao@nanshan.edu.cn。
基金资助:
山东省高等学校青创科技计划(2019KJA019)

Influence of pre-aging time on microstructure and properties of 7A85 aluminum alloy during RRA process

Yang Chunmiao¹, Wang Shan¹, Wang Shuhui^1,2, Li Yanzhen³, Liu Wenwen^1,2

1. College of Engineering, Yantai Nanshan University, Yantai Shandong 265713, China;
2. Light Alloy Processing Laboratory, Yantai Nanshan University, Yantai Shandong 265700, China;
3. Hangxin Material Testing Technology Co., Ltd., Yantai Shandong 265700, China

Received:2021-10-24 Revised:2021-01-04 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 系统研究了RRA处理过程预时效时间对7A85铝合金微观组织演变和性能的影响。利用Jmat-Pro软件计算了相变规律和TTT图,测试了硬度和拉伸性能指标,利用TEM表征了微观组织。结果表明,热力学平衡状态下,410 ℃开始析出MgZn₂相,体积分数达到9.5%左右;等温过程最先析出GP区,析出温度为室温~175 ℃,鼻尖温度在150 ℃左右;随着预时效时间的延长,硬度先升高后降低,20 h时达到峰值硬度192 HV;RRA处理过程,预时效时间为12 h时,屈服强度和抗拉强度达到峰值,分别为625 MPa和675 MPa;120 ℃保温20 h峰值时效状态下,η′-MgZn析出相尺寸在5~10 nm;预时效时间为12 h时,RRA处理后晶界处的Al-Zn-Mg-Cu四元相粒子呈不连续分布,尺寸在50~125 nm范围。

关键词: 7A85铝合金, 预时效处理, RRA处理, 微观组织, 硬度

Abstract: Influence of pre-aging time on microstructure and properties of the 7A85 aluminum alloy during RRA process was investigated. The thermodynamic equilibrium phase transformation and TTT curves were calculated by Jmat-Pro. The hardness and tensile properties were tested and microstructure was characterized by means of TEM. The results indicate that MgZn₂ phase begins to precipitate at 410 ℃ under thermodynamic equilibrium, volume fraction of which reaches about 9.5%. The GP zone is precipitated first during the isothermal process in the temperature range of room temperature to 175 ℃, and the nose tip temperature is about 150 ℃. With the extension of pre-aging time, the hardness first increases and then decreases, and reaches a peak hardness of 192 HV after aging for 20 h. The yield strength and tensile strength reach the peak value of 625 MPa and 675 MPa, respectively, when the pre-aging time is 20 h during the RRA process. During the heat preservation process at 120 ℃, under the peak aging state of 20 h, the size of the η′-MgZn precipitated phase is 5-10 nm. When the pre-aging time is 12 h, the Al-Zn-Mg-Cu quaternary phase particles with the size of 50-125 nm at the grain boundaries are discontinuously distributed after RRA treatment.

Key words: 7A85 aluminum alloy, pre-aging treatment, RRA treatment, microstructure, hardness

中图分类号:

TG156.1

杨春苗, 王珊, 王淑慧, 李延珍, 刘文文. RRA过程中预时效时间对7A85铝合金组织性能的影响[J]. 金属热处理, 2022, 47(3): 44-47.

Yang Chunmiao, Wang Shan, Wang Shuhui, Li Yanzhen, Liu Wenwen. Influence of pre-aging time on microstructure and properties of 7A85 aluminum alloy during RRA process[J]. Heat Treatment of Metals, 2022, 47(3): 44-47.

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RRA过程中预时效时间对7A85铝合金组织性能的影响

Influence of pre-aging time on microstructure and properties of 7A85 aluminum alloy during RRA process

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