升温速率对AA2060铝锂合金中间形变热处理微观组织的影响

doi:10.11896/cldb.21020008

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Abstract The samples of AA2060 alloy were two-stage homogenized, then cooled in the furnace, and subsequently deformed through the five pass rol-ling at 400 ℃, with 50% pre-rolled samples obtained finally. The 50% pre-rolled samples were tested by Gleeble-3800 thermal simulation machine at 450 ℃ at strain rate of 0.01 s^-1, and the hot compression of samples were carried out with heating rate of 5 ℃/s, 10 ℃/s and 20 ℃/s, respectively. The microstructure evolution of precipitates and recrystallization under different heating rates were characterized by transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and backscattered electron image (BSE). According to the results, the precipitation quantity and size of the θ′(Al₂Cu) phase increase with the heating rate decreasing, while the strain stress and strain har-dening rate decrease. Continuous recrystallization (CDRX), discontinuous recrystallization (DDRX), and sub-dynamic recrystallization (MDRX) occur du-ring hot deformation, in which CDRX and MDRX are the mainly recrystallization mechanisms during the ITMP process. Moreover, with the increase of heating rate, the proportion of CDRX and MDRX decreases.

Key words： AA2060 alloy intermediate thermo-mechanical treatment process(ITMP) heating rate recrystallization microstructure evolution

Published: Online: 2022-04-07

CLC number:

TG335.5

Fund:National Natural Science Foundation of China (51421001) and the Fundamental Research Funds for the Central Universities(2020CDJDCL001).

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	LI Chaoyang
	HUANG Guangjie
	CAO Lingfei
	CAO Yu
	LIN Lin

Cite this article:

LI Chaoyang,HUANG Guangjie,CAO Lingfei, et al. Effect of Heating Rate on Microstructural Evolution During Thermo-Mechanical Treatment Processing in AA2060 Alloy[J]. Materials Reports, 2022, 36(7): 21020008-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21020008 OR http://www.mater-rep.com/EN/Y2022/V36/I7/21020008

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