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Title: A phase field dislocation dynamics model for a bicrystal interface system: An investigation into dislocation slip transmission across cube-on-cube interfaces

Journal Article · · International Journal of Plasticity
 [1];  [2];  [2];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this study, we present a phase field dislocation dynamics formulation designed to treat a system comprised of two materials differing in moduli and lattice parameters that meet at a common interface. We apply the model to calculate the critical stress τcrit required to transmit a perfect dislocation across the bimaterial interface with a cube-on-cube orientation relationship. The calculation of τcrit accounts for the effects of: 1) the lattice mismatch (misfit or coherency stresses), 2) the elastic moduli mismatch (Koehler forces or image stresses), and 3) the formation of the residual dislocation in the interface. Our results show that the value of τcrit associated with the transmission of a dislocation from material 1 to material 2 is not the same as that from material 2 to material 1. Dislocation transmission from the material with the lower shear modulus and larger lattice parameter tends to be easier than the reverse and this apparent asymmetry in τcrit generally increases with increases in either lattice or moduli mismatch or both. In efforts to clarify the roles of lattice and moduli mismatch, we construct an analytical model for τcrit based on the formation energy of the residual dislocation. We show that path dependence in this energetic barrier can explain the asymmetry seen in the calculated τcrit values.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER46398; 20130745ECR; 20140348ER; AC52-06NA25396
OSTI ID:
1246364
Alternate ID(s):
OSTI ID: 1252020
Report Number(s):
LA-UR-15-25049; PII: S0749641915001473
Journal Information:
International Journal of Plasticity, Vol. 79, Issue C; ISSN 0749-6419
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (6)

A review of slip transfer: applications of mesoscale techniques journal December 2017
Room temperature deformation mechanisms of Mg/Nb nanolayered composites journal May 2018
A computational approach towards modelling dislocation transmission across phase boundaries journal May 2019
A computational approach towards modelling dislocation transmission across phase boundaries text January 2019
A computational approach towards modelling dislocation transmission across phase boundary text January 2018
The Peierls--Nabarro FE model in two-phase microstructures -- a comparison with atomistics text January 2018