A study of epitaxial growth behaviors of equiaxed alpha phase at different cooling rates in near alpha titanium alloy
文献类型：期刊论文
| 作者 | Gao, Xiongxiong ; Zeng, Weidong ; Zhang, Saifei ; Wang, Qingjiang |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2017 |
| 卷号 | 122页码:298-309 |
| 关键词 | Titanium alloy Microstructure Epitaxial growth Rim-alpha Solute atoms diffusion |
| ISSN号 | 1359-6454 |
| 通讯作者 | Zeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China. |
| 中文摘要 | 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. |
| 学科主题 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 收录类别 | SCI |
| 资助信息 | Research Fund for the Program of National Natural Science Foundation of China [51075333]; Program of National Key Research and Development Plan of China [2016YFB0301200] |
| 语种 | 英语 |
| 公开日期 | 2017-08-17 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/78384]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 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.(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. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。