Effect of aging temperature on tensile properties and intergranular corrosion sensitivity of cold rolled 2A97 Al-Li alloy

doi:10.13251/j.issn.0254-6051.2024.11.032

Abstract

Abstract: Effect of aging treatment (150-210 ℃, 1 h) on the tensile properties and intergranular corrosion sensitivity of 2A97 Al-Li alloy after solid solution treatment(525 ℃×1 h) and 70% reduction cold rolling was investigated by tensile test, intergranular corrosion test, scanning electron microscopy and transmission electron microscopy. The results show that with the increase of aging temperature, the strength of the alloy increases first and then decreases, and the elongation decreases continuously. The corrosion type changes from uniform corrosion to pitting corrosion and the maximum corrosion depth gradually increases, which is related to the precipitation of T₁ phase and θ′ phase in the grains, and the intermittent distribution of precipitated phase at the grain boundary. When the aging temperature is 180 ℃, the alloy can obtain high strength(597, 540 MPa), high elongation(6.9%), and no intergranular corrosion sensitivity.

Key words: 2A97 Al-Li alloy, aging temperature, tensile property, intergranular corrosion sensitivity

CLC Number:

TG146.21

Li Mengqi, Wang Zhixiu, Li Hai. Effect of aging temperature on tensile properties and intergranular corrosion sensitivity of cold rolled 2A97 Al-Li alloy[J]. Heat Treatment of Metals, 2024, 49(11): 209-214.

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