不同热处理工艺下6111铝合金的组织及抗晶间腐蚀

doi:10.13251/j.issn.0254-6051.2023.06.017

摘要/Abstract

摘要： 采用金相显微镜、透射电镜、X射线衍射仪等研究6111铝合金经不同温度固溶、预时效后的组织和晶间腐蚀情况。结果表明, 在不同温度固溶和预时效后, 晶粒均发生了再结晶, 部分晶粒沿着轧制方向拉长, 520 ℃和540 ℃固溶后的平均晶粒尺寸为60~70 μm, 560 ℃固溶后的平均晶粒尺寸略大于520 ℃和540 ℃, 为80 μm左右。520 ℃固溶、80 ℃预时效后的抗晶间腐蚀最差, 腐蚀深度为191.59 μm, Q相在晶界处连续分布, 表面晶粒尺寸较小;540 ℃固溶、80 ℃预时效后的抗晶间腐蚀最好, 腐蚀深度为59.63 μm, Q相在晶界处断续分布, 并未发现尺寸较小的表面晶粒。

关键词: 6111铝合金, 固溶温度, 预时效, 表面晶粒尺寸, 抗晶间腐蚀

Abstract: Microstructure and intergranular corrosion of 6111 aluminum alloy solution treated and pre-aged at different temperatures were studied by means of metallographic microscope, transmission electron microscope, X-ray diffractometer. The results show that after solution treatment and pre-aging at different temperatures, the grains are recrystallized, some of which are elongated along the rolling direction. The average grain size is 60-70 μm after solution treatment at 520 ℃ and 540 ℃. The average grain size solution treated at 560 ℃ is slightly larger than that solution treated at 520 ℃ and 540 ℃, about 80 μm. The intergranular corrosion resistance solution treated at 520 ℃ and pre-aged at 80 ℃ is the worst, the corrosion depth is 191.59 μm, the Q phase is continuously distributed at the grain boundary, and the surface grain size is small. The intergranular corrosion resistance solution treated at 540 ℃ and pre-aged at 80 ℃ is the best, and the corrosion depth is 59.63 μm. The Q phase is intermittently distributed at the grain boundary, and no surface grains with smaller size are found.

Key words: 6111 aluminum alloy, solution temperature, pre-aging, surface grain size, intergranular corrosion resistance

中图分类号:

TG146.2

迟蕊, 徐志远, 李涛, 李延成, 王芝东, 张华. 不同热处理工艺下6111铝合金的组织及抗晶间腐蚀[J]. 金属热处理, 2023, 48(6): 95-100.

Chi Rui, Xu Zhiyuan, Li Tao, Li Yancheng, Wang Zhidong, Zhang Hua. Microstructure and intergranular corrosion resistance of 6111 aluminum alloy after different heat treatment processes[J]. Heat Treatment of Metals, 2023, 48(6): 95-100.

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