Microstructure and intergranular corrosion resistance of 6111 aluminum alloy after different heat treatment processes

doi:10.13251/j.issn.0254-6051.2023.06.017

Abstract

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

CLC Number:

TG146.2

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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