Abstract: The effects of intermediate thermo-mechanical treatment (ITMT) on the short-transverse tensile properties and microstructure of an Al-Li alloy with T84 heat treatment status were studied by room temperature tensile testing, SEM, X-ray diffraction, electron back-scattered diffraction and transmission electron microscopy. The results show that, with the increasing of cold compression deformation, yield strength and tensile strength keep stable while elongation increases at first and then decreases. The cold deformation process can improve the Al-Li alloy recrystallization degree of alloy in the subsequent heat treatment. Meanwhile, the number and size of the coarse second decreases, and the appearance of the T1 phase at grain boundary is limited. The grain shape, coarse second phase and precipitated phase affect the elongation of the alloy simultaneously on the ST direction. With 20% deformation, the Rp0.2 is 436 MPa, the Rm is 543 MPa, the elongation is 5.1%, and the Al-Li alloy has the best matching of strength and plasticity.
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2022, Vol. 36 
