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.

引用

页码：3 / 11

页数：9

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