基于位错密度分析的Ti-8Al-1Mo-1V钛合金片层组织在热轧及退火过程中的演变机制

doi:10.11896/cldb.19050117

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Abstract The lamellar microstructure's evolution pattern and mechanism for Ti-8Al-1Mo-1V titanium alloy during hot rolling and subsequent annealing were studied by means of OM, EBSD, TEM etc. The results show that: hot rolling and subsequent annealing can not easily realize the glo-bularization of lamellar α phase. These processes can only realize the continuous distribution of α phase as well as the globularization of β phase. Insufficient accumulation of dislocation density during hot rolling is the main reason causing the lack of driving force for recrystallization for lamellar α. By comparing with the thick lamellar α phase, the thin and tiny β phase can be more easily broken into segments under the same rolling force. In the following annealing process, the segmented β phase can realize globularization through diffusion. Based on analyses, this work proposes the lamellar microstructure's evolution mechanism for Ti-8Al-1Mo-1V titanium alloy. In addition, it is found that the (0221)[3122] planar texture can be formed during the hot rolling of Ti-8Al-1Mo-1V titanium alloy with lamellar microstructure.

Key words： Ti-8Al-1Mo-1V hot rolling lamellar microstructure evolution texture

Published: 29 May 2020

CLC number:

TG146.2+3

Fund:This work was financially supported by the National Natural Science Foundation Youth Fund of China (51801132).

About author:: Xiaohui Shi received his Ph. D. degree in materials processing from Northwestern Polytechnical University in 2016. He is currently an lecturer in Taiyuan University of Technology. His research interests are microstructure-mechanical properties interrelations of titanium alloys.

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	SHI Xiaohui
	CAO Zuhan
	ZHANG Min
	GUO Ruipeng
	QIAO Junwei

Cite this article:

SHI Xiaohui,CAO Zuhan,ZHANG Min, et al. Lamellar Microstructure's Evolution Mechanism for Ti-8Al-1Mo-1V Titanium Alloy During Hot Rolling and Subsequent Annealing Based on Dislocation Density Analysis[J]. Materials Reports, 2020, 34(12): 12101-12104.

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http://www.mater-rep.com/EN/10.11896/cldb.19050117 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12101

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