Effect of thermal deformation on microstructure uniformity and mechanical properties of 2A97 Al-Li alloy sheet
Aiming at the difference of properties caused by the microstructure inhomogeneity of 2A97 Al-Li alloy,the microstructure uni-formity of 2A97 Al-Li alloy were improved by thermoplastic deformation and its mechanical properties were further improved.The unidi-rectional compression method was adopted,the deformation amount was selected as 30％and 60％,the deformation temperature was 400 ℃,the solution parameters were 520 ℃ for 1 h,and the aging parameters were 165 ℃ for 50 h.The results show that thermoplastic deformation can significantly improve the microstructure uniformity of 2A97 Al-Li alloy and inhibit the texture formation during solu-tion.The deformation of 60％can break the bulk eutectic phase and acicular precipitated phase in the original structure,improve the de-gree of solid solution,promote the recrystallization process,produce a large number of recrystallized average with grain size of 2 μm,the size of T1 phase and θ'phase precipitated after aging is large and dense,and the ultimate tensile stress of 2A97 Al-Li alloy reaches 510 MPa,which increases by 11.8％compared with simple solid solution aging.
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