Grain size and sample size interact to determine strength in a soft metal

被引：76

作者：

Ehrler, B. ^{[1
]}

Hou, X. D. ^{[2
]}

Zhu, T. T. ^{[2
]}

Png, K. M. Y. ^{[2
]}

Walker, C. J. ^{[1
]}

Bushby, A. J. ^{[2
]}

Dunstan, D. J. ^{[1
]}

机构：

[1] Univ London, Queen Mary, Sch Engn & Mat Sci,Ctr Mat Res, Dept Phys, London, England

[2] Univ London, Queen Mary, Sch Engn & Mat Sci,Ctr Mat Res, Dept Mat Sci, London, England

来源：

PHILOSOPHICAL MAGAZINE | 2008年 / 88卷 / 25期

基金：

英国工程与自然科学研究理事会;

关键词：

metal foil; nickel; plasticity; strain measurement; size effect; microband tests;

D O I：

10.1080/14786430802392548

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Understanding the strengthening of small-scale materials and structures is one of the key issues in nanotechnology. Many theories exist, each addressing a small domain of experimentally observed size effects and invoking different mechanisms. Measurements of the stress-strain relationship of nickel foils in flexure by the load-unload method provide strikingly accurate data from the elastic region through the yield point and to high plastic strain. The data show that the effects on the rate of work-hardening due to crystallite size and sample size interact, whereas in existing theories they should be independent. Existing theories cannot be complete. The symmetry of the dependence of flow stress on grain size and structure size suggests that strengthening effects are due to a finite strained volume, however this is delimited.

引用

页码：3043 / 3050

页数：8

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