Atomistic simulations of intersection cross-slip nucleation in L12 Ni3Al

被引：15

作者：

Rao, S. I. ^{[1
]}

Dimiduk, D. M. ^{[1
]}

Parthasarathy, T. A. ^{[2
]}

Uchic, M. D. ^{[1
]}

Woodward, C. ^{[1
]}

机构：

[1] USAF, Res Lab, Mat & Mfg Directorate, AFRLI MLLM, Wright Patterson AFB, OH 45433 USA

[2] Universal Energy Syst Inc, Dayton, OH 45432 USA

来源：

SCRIPTA MATERIALIA | 2012年 / 66卷 / 06期

关键词：

L1(2) Ni3Al; Atomistic simulations; Cross slip; Activation energy; Dislocation intersection; SCREW DISLOCATION INTERSECTIONS; ANOMALOUS YIELD-STRESS; ORIENTATION DEPENDENCE; METALS; MODEL;

D O I：

10.1016/j.scriptamat.2011.12.002

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Using atomistic simulations, the authors evaluate the activation barrier for a screw superdislocation to form the Paidar-Pope-Vitek (PPV) locked configuration when intersecting a forest dislocation in L1(2) Ni3Al, as a function of the superpartial core width. It is shown that the PPV lock is stable at the intersection, unlike when formed along an isolated dislocation line, and that the activation energy for cross slip at the forest dislocation intersection is significantly lower than that for cross slip along an isolated dislocation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：410 / 413

页数：4

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