Ti-44Al-5Nb-1Mo-(V,B)合金热变形过程中的相变、再结晶行为及组织调控

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Abstract The intrinsic brittleness of TiAl alloy leads to its poor deformability, which severely limits the wide application of TiAl alloy.In this work, the homogenized Ti-44Al-5Nb-1Mo-(V, B) alloy was taken as the research object, and the effects of deformation conditions on the microstructure of TiAl alloy were discussed from four aspects (deformation temperature, deformation amount, deformation rate and holding time) by thermal simulation single pass compression experiment. The results show that at the initial stage of thermal compression deformation, the first thing that happens is the bending deformation of lamellar, and some sheets are “broken” (induced by recrystallization and phase transformation). With the deformation gradually increasing to 40%, the equiaxed grains produced by lamellar “crushing” increase, and the residual lamellar clusters decrease obviously. In addition, the increase of deformation temperature and the decrease of strain rate can promote the occurrence of dynamic recrystallization and phase transformation behaviors such as L(α₂/γ)→γ+β+α. With the increase of holding time, the recrystallization degree of grains increases. Deformation temperature of 1 200—1 250 ℃, strain rate of 0.01 s^-1, deformation of 60% and holding time of 1 800 s are the best conditions for recrystallization and phase transformation of this alloy, uniform and fine near-full lamellar structure can be obtained.

Key words： TiAl alloy thermal deformation behavior phase transformation recrystallization microstructure

Published: 05 June 2022 Online: 2022-06-08

CLC number:

TG146.2

Fund:National Natural Science Foundation of china (52071065) and the Foundamental Research Funds for the Central Universities(N2007007).

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	Articles by authors
	GUO Ruiqi
	WANG Xiuqi
	LIU Guohuai
	LI Tianrui
	WANG Zhaodong

Cite this article:

GUO Ruiqi,WANG Xiuqi,LIU Guohuai, et al. Phase Transformation, Recrystallization and Microstructure Control During Hot Deformation of Ti-44Al-5Nb-1Mo-(V,B) Alloy[J]. Materials Reports, 2022, 36(Z1): 22010111-6.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2022/V36/IZ1/22010111

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