Pinning of dislocations in disordered alloys: effects of dislocation orientation

Language
en
Document Type
Article
Issue Date
2023-06-26
First published
2022-01-06
Issue Year
2022
Authors
Zaiser, Michael
Wu, Ronghai
Editor
Abstract

The current interest in compositionally complex alloys including so called high entropy alloys has caused renewed interest in the general problem of solute hardening. It has been suggested that this problem can be addressed by treating the alloy as an effective medium containing a random distribution of dilatation and compression centers representing the volumetric misfit of atoms of different species. The mean square stresses arising from such a random distribution can be calculated analytically, their spatial correlations are strongly anisotropic and exhibit long-range tails with third-order power law decay (Geslin and Rodney 2021; Geslin et al. 2021). Here we discuss implications of the anisotropic and long-range nature of the correlation functions for the pinning of dislocations of arbitrary orientation. While edge dislocations are found to follow the standard pinning paradigm, for dislocations of near screw orientation we demonstrate the co-existence of two types of pinning energy minima.

Journal Title
Materials Theory
Volume
6
Citation
Materials Theory 6 (2022): 4. <https://materialstheory.springeropen.com/articles/10.1186/s41313-021-00036-2>
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