Evolution of equiaxed alpha phase during heat treatment in a near alpha titanium alloy

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	Evolution of equiaxed alpha phase during heat treatment in a near alpha titanium alloy
	Gao, Xiongxiong; Zeng, Weidong; Wang, Yubo; Long, Yu; Zhang, Saifei; Wang, Qingjiang; Zeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
刊名	ELSEVIER SCIENCE SA
	2017-11-25
卷号	725 页码:536-543
关键词	Near Alpha Titanium Alloy Microstructure Refinement Recrystallization Boundary Splitting
ISSN号	0925-8388
英文摘要	The evolution of equiaxed primary a phase (alpha(p)) during post-deformation heat treatment of near-alpha titanium alloy Ti-5.6Al-3.8Sn-3.2Zr-1.0Ta-0.5Mo-0.4Nb-0.35Si was studied. This alloy was isothermally compressed at 1019 degrees C and subsequently heat treatment at 1024 degrees C for times ranging from 0.5 to 24 h. The recrystallization behavior and boundary splitting within equiaxed ap were analyzed by crystallo-graphic orientation and microstructure observations. The results showed that the formation of internal (sub) boundaries within the alpha(p) was by the strong recovery. In most cases, it is difficult to obtain a refinement of big equiaxed alpha(p) by boundary splitting and ap grains were still contiguous with "peanut" shape at relatively short heat treatment time (<= 24 h, 1024 degrees C). The groove in the "peanut" structure was indicative of boundary of alpha/alpha. Only in a few cases, when an isolated beta grain can form within the interior ap along the (sub) boundary, refinement of ap grain may be achieved due to the obvious reduction of boundary splitting distance. These observations were rationalized on the basis of the classical Mullins grooving analysis. (C) 2017 Elsevier B.V. All rights reserved.; The evolution of equiaxed primary a phase (alpha(p)) during post-deformation heat treatment of near-alpha titanium alloy Ti-5.6Al-3.8Sn-3.2Zr-1.0Ta-0.5Mo-0.4Nb-0.35Si was studied. This alloy was isothermally compressed at 1019 degrees C and subsequently heat treatment at 1024 degrees C for times ranging from 0.5 to 24 h. The recrystallization behavior and boundary splitting within equiaxed ap were analyzed by crystallo-graphic orientation and microstructure observations. The results showed that the formation of internal (sub) boundaries within the alpha(p) was by the strong recovery. In most cases, it is difficult to obtain a refinement of big equiaxed alpha(p) by boundary splitting and ap grains were still contiguous with "peanut" shape at relatively short heat treatment time (<= 24 h, 1024 degrees C). The groove in the "peanut" structure was indicative of boundary of alpha/alpha. Only in a few cases, when an isolated beta grain can form within the interior ap along the (sub) boundary, refinement of ap grain may be achieved due to the obvious reduction of boundary splitting distance. These observations were rationalized on the basis of the classical Mullins grooving analysis. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	Research Fund for the Program of National Natural Science Foundation of China [51075333]; Program of National Key Research and Development Plan of China [2016YFB0301200]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78969]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
推荐引用方式 GB/T 7714	Gao, Xiongxiong,Zeng, Weidong,Wang, Yubo,et al. Evolution of equiaxed alpha phase during heat treatment in a near alpha titanium alloy[J]. ELSEVIER SCIENCE SA,2017,725:536-543.
APA	Gao, Xiongxiong.,Zeng, Weidong.,Wang, Yubo.,Long, Yu.,Zhang, Saifei.,...&Zeng, WD .(2017).Evolution of equiaxed alpha phase during heat treatment in a near alpha titanium alloy.ELSEVIER SCIENCE SA,725,536-543.
MLA	Gao, Xiongxiong,et al."Evolution of equiaxed alpha phase during heat treatment in a near alpha titanium alloy".ELSEVIER SCIENCE SA 725(2017):536-543.