Effects of Tool Rotation Rates on Superplastic Deformation Behavior of Friction Stir Processed Mg-Zn-Y-Zr Alloy
文献类型：期刊论文
| 作者 | Xie Guangming1; Ma Zongyi2; Xue Peng2; Luo Zongan1; Wang Guodong1 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2018-12-11 |
| 卷号 | 54期号:12页码:1745-1755 |
| 关键词 | friction stir processing magnesium alloy superplasticity grain boundary |
| ISSN号 | 0412-1961 |
| DOI | 10.11900/0412.1961.2018.00174 |
| 通讯作者 | Xie Guangming(xiegm@ral.neu.edu.cn) |
| 英文摘要 | Compared to conventional Mg-Al and Mg-Zn system magnesium alloys, the Mg-Zn-Y-Zr heat-resistant alloy exhibits high thermal stability due to the addition of Y earth element, which is an ideal candidate for producing high strain rate superplasticity (HSRS, strain rate >= 1 x 10(-2) s(-1)). Recently, the HSRS of Mg-Zn-Y-Zr alloy was achieved by friction stir processing (FSP), because the FSP resulted in the generation of fine and equiaxed recrystallized grains and fine and homogeneous second phase particles. However, the study on superplastic deformation mechanism of FSP Mg-Zn-Y-Zr alloy at various parameters is limited relatively. Therefore, at the present work, six millimeters thick as-extruded Mg-Zn-Y-Zr plates were subjected to FSP at relatively wide heat input range of rotation rates of 800 r/min to 1600 r/min with a constant traverse speed of 100 mm/min, obtaining FSP samples consisting of homogeneous, fine and equiaxed dynamically recrystallized grains and fine and uniform Mg-Zn-Y ternary phase (W-phase) particles. With increasing rotation rate, within the FSP samples the W-phase particles were broken up and dispersed significantly and the recrystallized grains were refined slightly, while the fraction ratio of the high angle grain boundaries (grain boundaries misorientation angle >= 15 degrees) was increased obviously. Increasing rotation rate resulted in an increase in both optimum strain rate and superplastic elongation. For the FSP sample obtained at 1600 r/min, a maximum elongation of 1200% was achieved at a high-strain rate of 1x10(-2) s(-1) and 450 degrees C. Grain boundary sliding was identified to be the primary deformation mechanism in the FSP samples at various rotation rates by superplastic data analyses and surfacial morphology observations. Furthermore, the increase in rotation rate accelerated superplastic deformation kinetics remarkably. For the FSP sample at 1600 r/min, superplastic deformation kinetics is in good agreement with the prediction by the superplastic constitutive equation for fine-grained magnesium alloys governed by grain boundary sliding mechanism. |
| 资助项目 | National Natural Science Foundation of China[51774085] ; National Natural Science Foundation of China[51671190] ; Fundamental Research for the Central Universities |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000454455600004 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China ; Fundamental Research for the Central Universities |
| 源URL | [http://ir.imr.ac.cn/handle/321006/131065]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Xie Guangming |
| 作者单位 | 1.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie Guangming,Ma Zongyi,Xue Peng,et al. Effects of Tool Rotation Rates on Superplastic Deformation Behavior of Friction Stir Processed Mg-Zn-Y-Zr Alloy[J]. ACTA METALLURGICA SINICA,2018,54(12):1745-1755. |
| APA | Xie Guangming,Ma Zongyi,Xue Peng,Luo Zongan,&Wang Guodong.(2018).Effects of Tool Rotation Rates on Superplastic Deformation Behavior of Friction Stir Processed Mg-Zn-Y-Zr Alloy.ACTA METALLURGICA SINICA,54(12),1745-1755. |
| MLA | Xie Guangming,et al."Effects of Tool Rotation Rates on Superplastic Deformation Behavior of Friction Stir Processed Mg-Zn-Y-Zr Alloy".ACTA METALLURGICA SINICA 54.12(2018):1745-1755. |
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。