From dislocation cores to strength and work-hardening:: a study of binary Ni3Al

被引：124
作者：
Kruml, T
Conforto, E
Lo Piccolo, B
Caillard, D
Martin, JL [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, IPMC, CH-1015 Lausanne, Switzerland
[2] CNRS, CEMES, F-31055 Toulouse 4, France
来源：
ACTA MATERIALIA | 2002年 / 50卷 / 20期
关键词：
intermetallics; transmission electron microscopy; dislocation core; flow stress; work-hardening;
D O I：
10.1016/S1359-6454(02)00364-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A quantitative model for the peak temperature in work-hardening in Ll(2) intermetallics is proposed. It is based on the competition between the exhaustion of mobile dislocations by the Kear Wilsdorf mechanism and the yielding of incomplete locks at high stress. The model is assessed by a set of experimental data measured in binary Ni3Al polycrystals of three different compositions. These include, in particular, the planar fault energies of the dislocation cores measured by weak-beam electron microscopy, combined with computer image simulations and macroscopic data about flow stress, work-hardening and mobile dislocation exhaustion rates. These parameters are measured as a function of alloy composition. The model also fits successfully data published for other Ll(2) compounds. (C) 2002 Published by Elsevier Science Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码：5091 / 5101
页数：11
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