Effect of solution treatment on microstructure and properties of 6061 aluminum alloy for hydrogen storage tank

doi:10.13251/j.issn.0254-6051.2024.11.036

Abstract

Abstract: Three kinds of solution treatment processes ((490, 500, 520) ℃×4 h+520 ℃×4 h) of 6061 aluminum alloy for hydrogen storage tank were developed, and the effect of solution process on the microstructure and mechanical properties of the alloy was studied. The results show that after solution treatment, recovery and recrystallization of the forged 6061 aluminum alloy occur in different degrees. Compared to the forged 6061 aluminum alloy without solution treatment and with directly aging, the strength and hardness of the 6061 aluminum alloy increase but the plasticity decreases after solution treatment and aging. The degree of second phase (AlFeSi related compounds and Mg₂Si phase) dissolution and the degree of recovery and recrystallization of the aluminum matrix have a significant impact on the strength of the alloy. As the degree of dissolution increases, the strength of the aluminum alloy increases accordingly, while as the degree of recovery and recrystallization of the aluminum matrix increases, the strength of the aluminum matrix decreases accordingly. Taking into account factors such as strength, hardness and plasticity, the optimal solution process is 500 ℃×4 h+520 ℃×4 h, with water cooling.

Key words: hydrogen storage tanks, 6061 aluminum alloy, solution treatment, second phase, mechanical properties

CLC Number:

TG156

Liu Tianxin, Yu Boren, Lu Mengyang, Xue Bing. Effect of solution treatment on microstructure and properties of 6061 aluminum alloy for hydrogen storage tank[J]. Heat Treatment of Metals, 2024, 49(11): 236-240.

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