A statistical model for predicting the mechanical properties of nanostructured metals with bimodal grain size distribution

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	A statistical model for predicting the mechanical properties of nanostructured metals with bimodal grain size distribution
	L. L. Zhu; S. Q. Shi; K. Lu; J. Lu
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:16 页码:5762-5772
摘要	A statistical analysis is employed to investigate the mechanical performance of nanostructured metals with bimodal grain size distribution. The contributions of microcracks in the plastic deformation are accounted for in the mechanism-based plastic model used to describe the strength and ductility of the bimodal metals. The strain-based Weibull probability distribution function and percolation analysis of microcracked solids are applied to predict the failure behavior of the bimodal metals. The numerical results show that the proposed model can describe the mechanical properties of the bimodal metals, including yield strength, strain hardening and uniform elongation. These predictions agree well with the experimental results. The stochastic approaches adopted in the proposed model successfully capture the failure behavior of bimodal coppers that are sensitive to grain size and the volume fraction of coarse grains in addition to the corresponding threshold for percolation. These results will benefit the optimization of both strength and ductility by controlling constituent fractions and the size of the microstructures in materials. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[lu, jian] city univ hong kong, dept mech & biomed engn, kowloon, hong kong, peoples r china. [zhu, linli] zhejiang univ, dept engn mech, sch aeronaut & astronaut, hangzhou 310027, zhejiang, peoples r china. [zhu, linli; shi, sanqiang] hong kong polytech univ, dept mech engn, kowloon, hong kong, peoples r china. [lu, ke] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;lu, j (reprint author), city univ hong kong, dept mech & biomed engn, kowloon, hong kong, peoples r china.;jianlu@cityu.edu.hk
关键词	Bimodal Grain Size Distribution Strength Ductility Weibull Probability Distribution Percolation Model High-tensile Ductility Plastic-deformation High-strength Nanocrystalline Metals Enhanced Plasticity Boundary Diffusion Al-alloy Copper Behavior Cracks
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60540
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. L. Zhu,S. Q. Shi,K. Lu,et al. A statistical model for predicting the mechanical properties of nanostructured metals with bimodal grain size distribution[J]. Acta Materialia,2012,60(16):5762-5772.
APA	L. L. Zhu,S. Q. Shi,K. Lu,&J. Lu.(2012).A statistical model for predicting the mechanical properties of nanostructured metals with bimodal grain size distribution.Acta Materialia,60(16),5762-5772.
MLA	L. L. Zhu,et al."A statistical model for predicting the mechanical properties of nanostructured metals with bimodal grain size distribution".Acta Materialia 60.16(2012):5762-5772.