Toward a quantitative understanding of mechanical behavior of nanocrystalline metals

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	Toward a quantitative understanding of mechanical behavior of nanocrystalline metals
	M. Dao; L. Lu; R. J. Asaro; J. T. M. De Hosson; E. Ma
	2007
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	55 期号:12 页码:4041-4065
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.
部门归属	mit, dept mat sci & engn, cambridge, ma 02139 usa. chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. univ calif san diego, dept struct engn, la jolla, ca 92093 usa. univ groningen, netherlands inst met res, dept appl phys, nl-9747 ag groningen, netherlands. univ groningen, ctr mat sci, nl-9747 ag groningen, netherlands. johns hopkins univ, dept mat sci & engn, baltimore, md 21218 usa.;dao, m (reprint author), mit, dept mat sci & engn, cambridge, ma 02139 usa;mingdao@mit.edu
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
URL	查看原文
WOS记录号	WOS:000247980200004
引用统计	被引频次：1020[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33491
专题	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.