热门
Toward a quantitative understanding of mechanical behavior of nanocrystalline metals
文献类型：期刊论文
| 作者 | M. Dao ; L. Lu ; R. J. Asaro ; J. T. M. De Hosson ; E. Ma |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2007 |
| 卷号 | 55期号:12页码:4041-4065 |
| 关键词 | nanocrystalline materials mechanical properties plastic deformation grain boundaries modeling strain-rate sensitivity severe plastic-deformation ultrafine-grained metals centered-cubic metals transmission electron-microscopy thermally-activated deformation molecular-dynamics simulation high-tensile ductility high-pressure torsion nano-scale twins |
| ISSN号 | 1359-6454 |
| 中文摘要 | Focusing on nanocrystalline (nc) pure face-centered cubic metals, where systematic experimental data are available, this paper presents a brief overview of the recent progress made in improving mechanical properties of nc materials, and in quantitatively and mechanistically understanding the underlying mechanisms. The mechanical properties reviewed include strength, ductility, strain rate and temperature dependence, fatigue and tribological properties. The highlighted examples include recent experimental studies in obtaining both high strength and considerable ductility, the compromise between enhanced fatigue limit and reduced crack growth resistance, the stress-assisted dynamic grain growth during deformation, and the relation between rate sensitivity and possible deformation mechanisms. The recent advances in obtaining quantitative and mechanics-based models, developed in line with the related transmission electron microscopy and relevant molecular dynamics observations, are discussed with particular attention to mechanistic models of partial/perfect-dislocation or deformation-twin-mediated deformation processes interacting with grain boundaries, constitutive modeling and simulations of grain size distribution and dynamic grain growth, and physically motivated crystal plasticity modeling of pure Cu with nanoscale growth twins. Sustained research efforts have established a group of nanocrystalline and nanostructured metals that exhibit a combination of high strength and considerable ductility in tension. Accompanying the gradually deepening understanding of the deformation mechanisms and their relative importance, quantitative and mechanisms-based constitutive models that can realistically capture experimentally measured and rain-size-dependent stress-strain behavior, strain-rate sensitivity and even ductility limit are becoming available. Some outstanding issues and future opportunities are listed and discussed. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/33491]  |
| 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 | M. Dao,L. Lu,R. J. Asaro,et al. Toward a quantitative understanding of mechanical behavior of nanocrystalline metals[J]. Acta Materialia,2007,55(12):4041-4065. |
| APA | M. Dao,L. Lu,R. J. Asaro,J. T. M. De Hosson,&E. Ma.(2007).Toward a quantitative understanding of mechanical behavior of nanocrystalline metals.Acta Materialia,55(12),4041-4065. |
| MLA | M. Dao,et al."Toward a quantitative understanding of mechanical behavior of nanocrystalline metals".Acta Materialia 55.12(2007):4041-4065. |
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。