Serrated flow and tensile properties of a Mg-Gd-Zn alloy
文献类型：期刊论文
| 作者 | D. Wu ; R. S. Chen ; E. H. Han |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 2012 |
| 卷号 | 532页码:267-274 |
| 关键词 | Magnesium alloys Portevin-Le Chatelier effect Shearing of precipitates Dynamic strain aging Tensile properties grain-size mechanical-properties single-crystals thorium alloy strain-rate magnesium texture ductility yield behavior |
| ISSN号 | 0921-5093 |
| 中文摘要 | The tensile deformation behavior of Mg-3Gd-Zn (wt.%) alloy sheets annealed and aged at different temperatures has been studied. Samples annealed at 400 degrees C for 1 h exhibit serrated flow when they are tensile tested at temperatures ranging from 150 degrees C to 250 degrees C and at strain rates of 1 x 10(-4) s(-1) to 1 x 10(-2) s(-1). The critical strain for onset of the serrated flow is observed to increase with increasing strain rate but decrease with increasing temperature. The temperature dependences of yield strength and ultimate strength exhibit a plateau, and the expected ductility dips are also observed in the temperature regime of serrated flow. For samples annealed at 480 degrees C for 1 h, the precipitates and serration both disappear. However, subsequent aging treatments result in the reappearance of a large amount of precipitates and the serration phenomenon, proving that the serrated flow in the Mg-3Gd-Zn sheets is mainly controlled by the shearing of precipitates by gliding dislocations. In addition, the observed static strain aging effect, the negative strain rate sensitivity and the calculated activation energy, combined with observations made by scanning electron microscopy, suggest that dynamic strain aging may also contribute to the serrations in the present alloy. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2013-02-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/60338]  |
| 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 | D. Wu,R. S. Chen,E. H. Han. Serrated flow and tensile properties of a Mg-Gd-Zn alloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2012,532:267-274. |
| APA | D. Wu,R. S. Chen,&E. H. Han.(2012).Serrated flow and tensile properties of a Mg-Gd-Zn alloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,532,267-274. |
| MLA | D. Wu,et al."Serrated flow and tensile properties of a Mg-Gd-Zn alloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 532(2012):267-274. |
入库方式： OAI收割
来源：金属研究所
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