中间形变热处理对铝锂合金短横向拉伸性能的影响

doi:10.11896/cldb.20060118

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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 R_p0.2 is 436 MPa, the R _m is 543 MPa, the elongation is 5.1%, and the Al-Li alloy has the best matching of strength and plasticity.

Key words： Al-Li alloy intermediate thermo-mechanical treatment (ITMT) tensile property recrystallization coarse second phase T₁ phase

Received: 25 September 2022 Published: 25 September 2022 Online: 2022-09-26

CLC number:

TG146.2

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	Articles by authors
	YU Juan
	LI Guoai
	FENG Zhaohui
	CHEN Junzhou
	ZHAO Weiyi

Cite this article:

YU Juan,LI Guoai,FENG Zhaohui, et al. Effect of Intermediate Thermo-mechanical Treatment on the Short-transverse Tensile Properties of an Al-Li Alloy[J]. Materials Reports, 2022, 36(18): 20060118-5.

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http://www.mater-rep.com/EN/10.11896/cldb.20060118 OR http://www.mater-rep.com/EN/Y2022/V36/I18/20060118

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