Strengthening mechanisms in nanocrystalline alloys

被引：51
作者：
Scattergood, R. O. [1 ]
Koch, C. C. [1 ]
Murty, K. L. [2 ]
Brenner, D. [1 ]
机构：
[1] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
[2] N Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27695 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 493卷 / 1-2期
关键词：
nanocrystalline alloys; strengthening mechanisms; Orowan model;
D O I：
10.1016/j.msea.2007.04.132
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The mechanisms for strengthening nanocrystalline metals by alloy additions are reviewed and a new model for nano-particle strengthening by Orowan bypassing in nano-grains is proposed. Recent experimental results for three different nanocrystalline alloy systems, Fe-Pb, Fe-Al2O3 and Al-Pb are presented and analyzed in terms of non-equilibrium solid solution strengthening, nano-composite strengthening and Orowan particle strengthening, respectively. Conflicting alloy hardening and softening effects observed in Al-Pb appear to be the result of interplay between Orowan particle hardening and a softening mechanism due to grain-boundary segregation. Preliminary MD simulations support the latter suggestion. (c) 2007 Elsevier B.V. All rights reserved.
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收藏
页码：3 / 11
页数：9
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