Effect of aging treatment on microstructure and mechanical properties of extruded 2195 Al-Li alloy

doi:10.13251/j.issn.0254-6051.2022.09.002

Abstract

Abstract: Effect of heat treatment on microstructure and mechanical properties of as-extruded 2195 Al-Li alloy was investigated. The results show that the mechanical properties of the as-extruded alloy can be significantly enhanced by solution treatment and artificial aging treatment, which is related to the type, size, number density and distribution of precipitated phases. The 2195 Al-Li alloy precipitation sequence during the aging process is SSSS(supersaturated solid solution)→GP zone+δ′/β′(Al₃(Li,Zr))→δ′+θ′(Al₂Cu)+T₁(Al₂CuLi)→θ′+T₁. The T₁ phase plays a leading role in precipitation strengthening. After solution treatment at 525 ℃ for 60 min and artificial aging at 170 ℃, the peak aging time of the 2195 Al-Li alloy is 36 h, under which the tensile strength, yield strength and elongation are 579 MPa, 537 MPa and 5.5%, respectively.

Key words: 2195 Al-Li alloy, solution treatment, aging, mechanical properties, precipitated phase

CLC Number:

TG156.2

Wang Zhiwen, Yang Rongdong, Huang Yuanchun, Li Hui. Effect of aging treatment on microstructure and mechanical properties of extruded 2195 Al-Li alloy[J]. Heat Treatment of Metals, 2022, 47(9): 6-11.

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