多级固溶对7136-0.35La铝合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2021.09.021

金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 124-128.DOI: 10.13251/j.issn.0254-6051.2021.09.021

多级固溶对7136-0.35La铝合金组织与性能的影响

王春华^1,5, 王峰², 王凤良³, 房洪杰^4,5, 杨丽娟¹

1.烟台南山学院材料科学与工程学院, 山东烟台 265713;
2.龙口南山东海氧化铝有限公司, 山东烟台 265706;
3.烟台南山学院航空学院, 山东烟台 265713;
4.烟台南山学院工学院, 山东烟台 265713;
5.轻合金加工成形实验室, 山东烟台 265713

收稿日期:2021-03-28 出版日期:2021-09-25 发布日期:2021-12-09
通讯作者: 房洪杰,教授,硕士,E-mail:h.j.fang@163.com
作者简介:王春华(1975—),女,副教授,硕士,主要研究方向为铝合金材料,E-mail:412404460@qq.com。
基金资助:
山东省高等学校科技计划(J18KB046);山东省重点研发计划(2017GGX20130)

Effect of multi-stage solid solution treatment on microstructure and properties of 7136-0.35La aluminum alloy

Wang Chunhua^1,5,Wang Feng² , Wang Fengliang³, Fang Hongjie^4,5, Yang Lijuan¹

1. College of Materials Science and Engineering ,Yantai Nanshan University, Yantai Shandong 265713, China;
2. Longkou Nanshan Donghai Alumina Co., Ltd., Yantai Shandong 265706, China;
3. College of Aeronautics, Yantai Nanshan University, Yantai Shandong 265713, China;
4. College of Engineering, Yantai Nanshan University, Yantai Shandong 265713, China;
5. Laboratory of Light Alloy Forming, Yantai Shandong 265713, China

Received:2021-03-28 Online:2021-09-25 Published:2021-12-09

摘要/Abstract

摘要： 将7136-0.35La合金进行一级、二级、三级固溶处理后均施以单级时效处理,通过扫描电镜、硬度计、万能拉伸试验机、电化学工作站等设备分别测试了合金的固溶态金相、拉伸断口形貌及能谱、合金硬度及断裂性能、电化学参数等。结果表明:三级固溶合金固溶态组织回溶效果较好,初步减少腐蚀裂纹源数量;三级固溶时效合金伸长率为13.65%,比单级固溶时效合金增长21.9%,且主断裂方式为韧性断裂;然而,单、双、三级固溶处理的3种时效态合金均表现出相似的耐电化学腐蚀性能,因此以腐蚀性能为主要指标时,首选单级固溶处理。

关键词: 多级固溶, 固溶态组织, 裂纹源, 抗电化学腐蚀能力

Abstract: 7136-0.35La aluminum alloy was subjected to solid solution treatment in single-, double-, and three-stage respectively and then single-stage aging, and the solid-solution metallography, tensile fracture morphology and energy spectra, alloy hardness, fracture properties, and electrochemical parameters were tested by scanning electron microscope, hardness tester, universal tensile tester, electrochemical workstation and other equipment. The results show that the re-dissolution effect for three-stage treated solid solution microstructure is better, and the number of corrosion cracking sources is preliminarily reduced. The elongation of the three-stage solution treated then aged alloy is 13.65%, which is 21.9% higher than that single-stage treated, and with ductile fracture as the primary fracture mode. However, the three aged alloys solid-solution treated in single-, double- and three-stages show similar resistance to electrochemical corrosion, so the single stage solution treatment is preferred when taking the corrosion property as the main criteria.

Key words: multi-stage solid solution, solid-solution state structure, crack source, electrochemical corrosion resistance

中图分类号:

TG146.21

王春华, 王峰, 王凤良, 房洪杰, 杨丽娟. 多级固溶对7136-0.35La铝合金组织与性能的影响[J]. 金属热处理, 2021, 46(9): 124-128.

Wang Chunhua,Wang Feng , Wang Fengliang, Fang Hongjie, Yang Lijuan. Effect of multi-stage solid solution treatment on microstructure and properties of 7136-0.35La aluminum alloy[J]. Heat Treatment of Metals, 2021, 46(9): 124-128.

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多级固溶对7136-0.35La铝合金组织与性能的影响

Effect of multi-stage solid solution treatment on microstructure and properties of 7136-0.35La aluminum alloy

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