热处理工艺对7075铝合金组织及晶间腐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2024.02.024

金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 159-165.DOI: 10.13251/j.issn.0254-6051.2024.02.024

热处理工艺对7075铝合金组织及晶间腐蚀性能的影响

高雪鹏^1,2, 孙有政^1,3, 曹善鹏¹, 牛博雅⁴, 李宾良⁴, 王萍³

1.山东南山铝业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 264000;
2.山东南山科学技术研究院有限公司山东省铝合金压力加工技术创新中心, 山东龙口 264000;
3.烟台南山学院材料科学与工程学院, 山东龙口 264000;
4.中航西安飞机工业集团股份有限公司, 陕西西安 710089

收稿日期:2023-09-06 修回日期:2024-01-07 出版日期:2024-03-27 发布日期:2024-03-27
通讯作者: 孙有政,高级工程师,博士,E-mail:sunyouzheng@nanshan.com.cn
作者简介:高雪鹏(1996—),女,硕士,主要研究方向为有色金属成形技术, E-mail:gxpxmm1314@126.com。

Effect of heat treatment on microstructure and intergranular corrosion resistance of 7075 aluminum alloy

Gao Xuepeng^1,2, Sun Youzheng^1,3, Cao Shanpeng¹, Niu Boya⁴, Li Binliang⁴, Wang Ping³

1. National Aluminum Alloy Pressure Processing Engineering Technology Research Center, Shandong Nanshan Aluminum Industry Co., Ltd., Longkou Shandong 264000, China;
2. Shandong Aluminum Alloy Pressure Processing Technology Innovation Center, Shandong Nanshan Institute of Science and Technology Co., Ltd., Longkou Shandong 264000, China;
3. School of Materials Science and Engineering, Yantai Nanshan University, Longkou Shandong 264000, China;
4. AVIC Xi'an Aircraft Industry Group Co., Ltd., Xi'an Shaanxi 710089, China

Received:2023-09-06 Revised:2024-01-07 Online:2024-03-27 Published:2024-03-27

摘要/Abstract

摘要： 采用光学显微镜、X射线衍射仪、扫描电镜、透射电镜等探究了Al-Zn-Mg-Cu系7075铝合金经一次固溶处理、二次固溶处理及分别峰值时效后的显微组织变化,并分析了显微组织差异对晶间腐蚀敏感性的影响。结果表明,7075铝合金经474 ℃二次固溶处理后与一次固溶相比,合金成分均匀性提高,晶间腐蚀敏感性显著降低。峰值时效后,晶界析出相呈链条状,两侧出现无沉淀析出带,阻碍了连续腐蚀通道的形成;晶界形成Cu元素富集的Mg(Zn, Cu)₂析出相,与铝基体的腐蚀电位差缩小,提高了材料的耐蚀性。二次固溶处理的合金过饱和固溶程度增大,促进了时效析出行为,峰值时效后析出相尺寸、数量均有所增加,晶界第二相间距增大,合金表现出更好的抗晶间腐蚀性能。

关键词: 7075铝合金, 固溶处理, 峰值时效, 晶间腐蚀

Abstract: Microstructure changes of Al-Zn-Mg-Cu 7075 aluminum alloy after single solution treatment, twice solution treatment and peak aging were investigated by means of optical microscope, X-ray diffractometer, scanning electron microscope and transmission electron microscope, and the effect of microstructure difference on intergranular corrosion sensitivity was analyzed. The results show that the composition uniformity of 7075 aluminum alloy increases and the intergranular corrosion sensitivity decreases significantly after twice solution treatment at 474 ℃ compared with single solution treatment. After peak aging, the grain boundary precipitates are chain-like, and precipitation-free precipitates appear on both sides, which hinders the formation of continuous corrosion channels. Cu enriched Mg(Zn,Cu)₂precipitates are formed at the grain boundary, and the corrosion potential difference with aluminum matrix is reduced, which improves resistance to intergranular corrosion of the material. The degree of supersaturated solid solution is increased in the twice solution treatment, which promoted the aging precipitation behavior. After the peak aging, the size and quantity of precipitated phase increase, and the spacing of the second phase at the grain boundary increases. The alloy shows better resistance to intergranular corrosion.

Key words: 7075 aluminum alloy, solution treatment, peak aging, intergranular corrosion

中图分类号:

TG166.3

高雪鹏, 孙有政, 曹善鹏, 牛博雅, 李宾良, 王萍. 热处理工艺对7075铝合金组织及晶间腐蚀性能的影响[J]. 金属热处理, 2024, 49(2): 159-165.

Gao Xuepeng, Sun Youzheng, Cao Shanpeng, Niu Boya, Li Binliang, Wang Ping. Effect of heat treatment on microstructure and intergranular corrosion resistance of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(2): 159-165.

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热处理工艺对7075铝合金组织及晶间腐蚀性能的影响

Effect of heat treatment on microstructure and intergranular corrosion resistance of 7075 aluminum alloy

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