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A study of epitaxial growth behaviors of equiaxed alpha phase at different cooling rates in near alpha titanium alloy
Gao, Xiongxiong; Zeng, Weidong; Zhang, Saifei; Wang, Qingjiang; Zeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China.
2017
发表期刊ACTA MATERIALIA
ISSN1359-6454
卷号122页码:298-309
摘要The epitaxial growth behaviors of equiaxed primary alpha phase (alpha(p)) at different cooling rates (150-0.15 degrees C/s) in a near alpha titanium alloy Ti60 were studied by optical micrograph, back scattered electron (BSE) images, high-resolution electron backscatter diffraction technique (EBSD) and electron probe micro-analysis (EPMA). Microstructural observations indicated that the size of alpha(p) significantly increased with decreasing cooling rate. The rim-alpha phase observed by BSE image, which formed at the periphery of ap during cooling and has an identical crystallographic orientation to the interior region of alpha(p) analyzed by Kikuchi diffraction patterns, is considered to be evidence of epitaxial growth of alpha(p). EBSD analysis also showed that ap preferentially grew extending for a distance along the WO boundary resulting in extension-alpha phase from alpha(p). The EPMA confirmed that contrast difference in BSE image within alpha(p) is caused by the difference in composition. The further microanalysis of local composition indicated that epitaxial growth during continuous cooling is mainly controlled by the diffusional redistribution of aluminum and molybdenum atoms between alpha(p) and 13 matrix. On this basis, the sizes of alpha(p) were theoretically calculated after continuous cooling based on a diffusion-controlled model, and model predictions showed good agreement with experimental measurements. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The epitaxial growth behaviors of equiaxed primary alpha phase (alpha(p)) at different cooling rates (150-0.15 degrees C/s) in a near alpha titanium alloy Ti60 were studied by optical micrograph, back scattered electron (BSE) images, high-resolution electron backscatter diffraction technique (EBSD) and electron probe micro-analysis (EPMA). Microstructural observations indicated that the size of alpha(p) significantly increased with decreasing cooling rate. The rim-alpha phase observed by BSE image, which formed at the periphery of ap during cooling and has an identical crystallographic orientation to the interior region of alpha(p) analyzed by Kikuchi diffraction patterns, is considered to be evidence of epitaxial growth of alpha(p). EBSD analysis also showed that ap preferentially grew extending for a distance along the WO boundary resulting in extension-alpha phase from alpha(p). The EPMA confirmed that contrast difference in BSE image within alpha(p) is caused by the difference in composition. The further microanalysis of local composition indicated that epitaxial growth during continuous cooling is mainly controlled by the diffusional redistribution of aluminum and molybdenum atoms between alpha(p) and 13 matrix. On this basis, the sizes of alpha(p) were theoretically calculated after continuous cooling based on a diffusion-controlled model, and model predictions showed good agreement with experimental measurements. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属[gao, xiongxiong ; zeng, weidong ; zhang, saifei] northwestern polytech univ, state key lab solidificat proc, xian 710072, peoples r china ; [wang, qingjiang] chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词Titanium Alloy Microstructure Epitaxial Growth Rim-alpha Solute Atoms Diffusion
学科领域Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者Research Fund for the Program of National Natural Science Foundation of China [51075333]; Program of National Key Research and Development Plan of China [2016YFB0301200]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/78384
专题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, Peoples R China.
推荐引用方式
GB/T 7714
Gao, Xiongxiong,Zeng, Weidong,Zhang, Saifei,et al. A study of epitaxial growth behaviors of equiaxed alpha phase at different cooling rates in near alpha titanium alloy[J]. ACTA MATERIALIA,2017,122:298-309.
APA Gao, Xiongxiong,Zeng, Weidong,Zhang, Saifei,Wang, Qingjiang,&Zeng, WD .(2017).A study of epitaxial growth behaviors of equiaxed alpha phase at different cooling rates in near alpha titanium alloy.ACTA MATERIALIA,122,298-309.
MLA Gao, Xiongxiong,et al."A study of epitaxial growth behaviors of equiaxed alpha phase at different cooling rates in near alpha titanium alloy".ACTA MATERIALIA 122(2017):298-309.
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