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Strengthening Mechanisms in Crystal Plasticity$
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Ali Argon

Print publication date: 2007

Print ISBN-13: 9780198516002

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198516002.001.0001

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THE LATTICE RESISTANCE

THE LATTICE RESISTANCE

Chapter:
(p.78) 4 THE LATTICE RESISTANCE
Source:
Strengthening Mechanisms in Crystal Plasticity
Author(s):

A. S. Argon

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198516002.003.0004

One of the most fundamental resistances to dislocation motion is that which the discrete lattice offers in a pure crystalline material in a temperature range where diffusion plays no role. This resistance will be considered from two mechanistically different points of view. First, the Peierls-Nabarro (PN) resistance is considered that results from the pulsing distortions of the dislocation core as it moves through the discrete lattice, affecting often the edge and screw dislocations differently and at very different levels in different crystal structures. Various models of this resistance affecting screw dislocations are examined in detail, leading to consideration of its temperature and strain rate dependence in many BCC metals, and to a lesser extent, in undoped diamond-cubic Si. Second, a form of ubiquitous resistance referred to as phonon drag, that arises from the interaction of moving dislocations with lattice thermal vibrations is presented. It is noted that the temperature dependence of phonon drag is radically different from that of the lattice resistance.

Keywords:   Peierls-Nabarro (P-N) dislocation, core misfit energy, P-N model, FCC metals, HCP metals, Schmidt law, BCC metals, non-Schmidt behavior, Kinks in screw dislocations, phonon drag

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