Superplasticity governed by effective grain size and its distribution in fine-grained aluminum alloys
文献类型：期刊论文
| 作者 | F. C. Liu ; Z. Y. Ma |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 2011 |
| 卷号 | 530页码:548-558 |
| 关键词 | Aluminum alloys Superplasticity Grain growth Friction stir processing strain rate superplasticity mg-sc alloy low-temperature superplasticity severe plastic-deformation 7075al alloy zr alloy al microstructure behavior model |
| ISSN号 | 0921-5093 |
| 中文摘要 | Although many efforts have been made to improve superplasticity in aluminum alloys by reducing grain size, the present study indicated that just reducing grain size was not sufficient. Three different grain-sized Al-Mg-Sc alloys with a similar misorientation distribution were fabricated by friction stir processing (FSP) and subjected to superplastic investigation. It was revealed that the medium-grained sample exhibited the largest elongation at the highest strain rate due to the optimum combination of proper fine grain and thermal stability. In-depth analyses showed that superplasticity was governed by the effective grain size (d(eff)) and its distribution just before tension rather than the initial grain size (d(ini)). The analyses on the superplastic data indicated that the large variation range in the dimensionless constant for superplastic deformation of FSP aluminum alloys was associated with the use of d(ini) rather than d(eff). A modified constitutive equation was developed to elucidate the d(eft) dependencies of superplastic flow stress which contributed to obtaining the true dimensionless constant and supporting the suggestion that the enhanced kinetics of grain boundary sliding was associated with high fraction of high-angle grain boundaries. (C) 2011 Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/30514]  |
| 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 | F. C. Liu,Z. Y. Ma. Superplasticity governed by effective grain size and its distribution in fine-grained aluminum alloys[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2011,530:548-558. |
| APA | F. C. Liu,&Z. Y. Ma.(2011).Superplasticity governed by effective grain size and its distribution in fine-grained aluminum alloys.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,530,548-558. |
| MLA | F. C. Liu,et al."Superplasticity governed by effective grain size and its distribution in fine-grained aluminum alloys".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 530(2011):548-558. |
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。