预时效处理对 Al-Zn-Mg-Cu 合金硬化响应及微观组织的影响

doi:10.13251/j.issn.0254-6051.2020.07.019

金属热处理 ›› 2020, Vol. 45 ›› Issue (7): 90-93.DOI: 10.13251/j.issn.0254-6051.2020.07.019

预时效处理对 Al-Zn-Mg-Cu 合金硬化响应及微观组织的影响

魏茂源^1,2, 王洪真¹, 张红¹, 滕敦波^1,2

1. 烟台南山学院工学院, 山东烟台 265700;
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 265713

收稿日期:2020-01-08 出版日期:2020-07-25 发布日期:2020-09-07
作者简介:魏茂源(1983—), 男, 讲师, 硕士, 主要研究方向为金属材料加工, E-mail:weimaoyuan1234@163.com
基金资助:
山东省高校科技计划(J18KA028);龙口市科技计划(2017GG23)

Effect of pre-aging treatment on hardening response and microstructure of Al-Zn-Mg-Cu alloy

Wei Maoyuan^1,2, Wang Hongzhen¹, Zhang Hong¹, Teng Dunbo^1,2

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

Received:2020-01-08 Online:2020-07-25 Published:2020-09-07

摘要/Abstract

摘要： 研究了预时效处理对Al-Zn-Mg-Cu铝合金薄板力学性能和微观组织的影响,测试了显微硬度和力学性能,表征了TEM微观精细组织。结果表明:固溶处理后在180 ℃立即进行人工时效处理,可获得Al-Zn-Mg-Cu合金的显著时效硬化效果,且在8 h后达到峰值硬度195 HV0.5,与基体呈共格关系的η′相为主要强化相;120 ℃×10 min为最佳的预时效处理制度,经14天的室温停滞后,相比于固溶+自然时效态,硬度降低了13 HV0.5,降幅达到10.7%,具有明显的抑制自然时效作用;预时效+自然时效态试样,经烘烤硬化处理后,屈服强度和抗拉强度分别达到了465和545 MPa,强度增量分别达到170和95 MPa,同时伸长率达到12.5%。

关键词: Al-Zn-Mg-Cu铝合金, 力学性能, 预时效处理, 微观组织

Abstract: Effect of pre-aging treatment on mechanical properties and microstructure of Al-Zn-Mg-Cu aluminum alloy was investigated. The micro-hardness and mechanical properties were tested. The microstructure was characterized. The results indicate that the best pre-aging hardening effect of the experimental Al-Zn-Mg-Cu aluminum alloy is achieved while aging at 180 ℃ immediately after solution treatment, during which the peak value reaches 195 HV0.5 and the main hardening phase is η′ phase. The optimal pre-aging treatment is under 120 ℃×10 min. Thus, after 14 days natural aging, the hardness of the alloy is decreased by 13 HV0.5 or 10.7% compared to the solution+natural aging treatment. Finally after bake hardening process, the yield strength and tensile strength of the pre-aged alloy reach 465 MPa and 545 MPa, showing a hardening increase of 170 MPa and 95 MPa,respectively, and the elongation reaches 12.5%.

Key words: Al-Zn-Mg-Cu aluminum alloy, mechanical properties, pre-aging treatment, microstructure

中图分类号:

TG156.1

魏茂源, 王洪真, 张红, 滕敦波. 预时效处理对 Al-Zn-Mg-Cu 合金硬化响应及微观组织的影响[J]. 金属热处理, 2020, 45(7): 90-93.

Wei Maoyuan, Wang Hongzhen, Zhang Hong, Teng Dunbo. Effect of pre-aging treatment on hardening response and microstructure of Al-Zn-Mg-Cu alloy[J]. Heat Treatment of Metals, 2020, 45(7): 90-93.

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预时效处理对 Al-Zn-Mg-Cu 合金硬化响应及微观组织的影响

Effect of pre-aging treatment on hardening response and microstructure of Al-Zn-Mg-Cu alloy

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