Superplastic deformation mechanism of an ultrafine-grained aluminum alloy produced by friction stir processing
文献类型：期刊论文
| 作者 | Z. Y. Ma ; F. C. Liu ; R. S. Mishra |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2010 |
| 卷号 | 58期号:14页码:4693-4704 |
| 关键词 | Superplasticity Friction stir processing Aluminum alloys Ultrafine-grained microstructure strain-rate superplasticity low-temperature superplasticity mg-sc alloy zr alloy threshold stress al-alloy creep composites growth flow |
| ISSN号 | 1359-6454 |
| 中文摘要 | An ultrafine-grained (UFG) Al-4Mg-1Zr alloy with a grain size of similar to 0.7 mu m with predominantly high-angle boundaries of 97% was produced by friction stir processing (FSP). The UFG Al-4Mg-1Zr retained submicrometer grains even after static annealing at 425 degrees C, and exhibited excellent superplasticity at 175-425 degrees C. High strain rate and low-temperature superplasticity of >1200% were observed at 1 x 10(-2)-1 x 10(-1) s(-1) and 300-350 degrees C. Even at 425 degrees C, a superplasticity of 1400% was achieved at 1 s(-1). A linear relationship between log (epsilon) over dot(opti) and T was observed (where (epsilon) over dot(opti) is the optimum strain rate, and T is the temperature). The analyses on the superplastic data revealed the presence of threshold stress, a stress exponent of 2, an inverse grain size dependence of 2, and an activation enemy of 142 kJ mol(-1). This indicated that the dominant deformation mechanism was grain boundary sliding, which was controlled by lattice diffusion. Based on this notion, a constitutive equation has been developed. A new superplastic deformation mechanism map for FSP aluminum alloys is proposed. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31369]  |
| 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 | Z. Y. Ma,F. C. Liu,R. S. Mishra. Superplastic deformation mechanism of an ultrafine-grained aluminum alloy produced by friction stir processing[J]. Acta Materialia,2010,58(14):4693-4704. |
| APA | Z. Y. Ma,F. C. Liu,&R. S. Mishra.(2010).Superplastic deformation mechanism of an ultrafine-grained aluminum alloy produced by friction stir processing.Acta Materialia,58(14),4693-4704. |
| MLA | Z. Y. Ma,et al."Superplastic deformation mechanism of an ultrafine-grained aluminum alloy produced by friction stir processing".Acta Materialia 58.14(2010):4693-4704. |
入库方式： OAI收割
来源：金属研究所
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