晶粒组织对Al-Cu合金应力腐蚀开裂行为及导电率的影响

doi:10.13251/j.issn.0254-6051.2024.03.040

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 244-250.DOI: 10.13251/j.issn.0254-6051.2024.03.040

晶粒组织对Al-Cu合金应力腐蚀开裂行为及导电率的影响

赵忠超¹, 唐和壮¹, 曹善鹏¹, 孙有政^1,2

1.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, 山东龙口 265700;
2.烟台南山学院材料科学与工程学院, 山东龙口 265700

收稿日期:2023-09-07 修回日期:2024-01-07 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 孙有政,高级工程师,博士,E-mail:sunyouzheng@nanshan.com.cn
作者简介:赵忠超(1995—),男,硕士研究生,主要研究方向为铝合金材料制造及热处理,E-mail:1085335646@qq.com。

Effect of grain structure on stress corrosion cracking behavior and electric conductivity of Al-Cu alloy

Zhao Zhongchao¹, Tang Hezhuang¹, Cao Shanpeng¹, Sun Youzheng^1,2

1. National Engineering Research Center for Plastic Working of Aluminium Alloys, Shandong Nanshan Aluminum Co., Ltd., Longkou Shandong 265700, China;
2. School of Materials Science and Engineering, Yantai Nanshan University, Longkou Shandong 265700, China

Received:2023-09-07 Revised:2024-01-07 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 通过研究和比较T3511态2224铝合金大尺寸Z字型断面不同位置的组织和应力腐蚀开裂行为,探讨了晶粒形态对抗应力腐蚀开裂能力和开裂方式的影响。结果表明,纤维状晶粒具有较低的应力腐蚀敏感性,在250 MPa应力下具有纤维状晶粒的试样52天断裂,而条状偏等轴晶粒试样的断裂时间仅为42天。条状偏等轴晶晶粒尺寸大且晶界为界面能较大的大角度晶界,晶界强度较低,应力腐蚀裂纹易沿着大角度晶界扩展。不同位置试样的开裂方式均为沿晶开裂,同时Z字型断面不同位置的导电率数值一直保持稳定。

关键词: 2224铝合金, 晶粒形态, 显微组织, 应力腐蚀, 开裂方式

Abstract: Though investigating and comparing the microstructure and stress corrosion cracking (SCC) behaviors at different locations of large-size Z-shaped sections of 2224 aluminum alloy in T3511 state, the effects of grain morphology on the SCC resistance and cracking modes were discussed. The results show that the specimens with fibre-like grains have lower stress corrosion sensitivity and are fractured in 52 days at stress of 250 MPa, while the specimens with nearly equiaxed grains are fractured in only 42 days. The nearly equiaxed grains have larger grain size and large-angle grain boundaries with higher interfacial energy, along which the stress corrosion crack is easy to propagate due to the lower grain boundary strength. The cracking mode of the specimens at different positions is all intergranular cracking, and the conductivity value in different positions of the Z-shaped section remains stable.

Key words: 2224 aluminum alloy, grain morphology, microstructure, stress corrosion, cracking mode

中图分类号:

TG379

赵忠超, 唐和壮, 曹善鹏, 孙有政. 晶粒组织对Al-Cu合金应力腐蚀开裂行为及导电率的影响[J]. 金属热处理, 2024, 49(3): 244-250.

Zhao Zhongchao, Tang Hezhuang, Cao Shanpeng, Sun Youzheng. Effect of grain structure on stress corrosion cracking behavior and electric conductivity of Al-Cu alloy[J]. Heat Treatment of Metals, 2024, 49(3): 244-250.

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晶粒组织对Al-Cu合金应力腐蚀开裂行为及导电率的影响

Effect of grain structure on stress corrosion cracking behavior and electric conductivity of Al-Cu alloy

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