Avalanches and scaling in plastic deformation

被引：91

作者：

Koslowski, M ^{[1
]}

LeSar, R ^{[1
]}

Thomson, R ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.93.125502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Plastic deformation of crystalline materials is a complex nonhomogeneous process characterized by avalanches in the motion of dislocations. We study the evolution of dislocation loops using an analytically solvable phase-field model of dislocations for ductile single crystals during monotonic loading. The distribution of dislocation loop sizes is given by P(A)similar toA(-sigma), with sigma=1.8+/-0.1. The exponent is in agreement with those found in acoustic emission experiments. This model also predicts a range of macroscopic behaviors in agreement with observation, including hardening with monotonic loading, and a maximum in the acoustic emission signal at the onset of yielding.

引用

页码：125502 / 1

页数：4

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