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Coupled motion of asymmetrical tilt grain boundaries: Molecular dynamics and phase field crystal simulations

Journal Article · · Acta Materialia
 [1];  [2];  [2];  [3]
  1. George Mason Univ., Fairfax, VA (United States); Northeastern University
  2. Northeastern Univ., Boston, MA (United States)
  3. George Mason Univ., Fairfax, VA (United States)

Previous simulation and experimental studies have shown that some grain boundaries (GBs) can couple to applied shear stresses and be moved by them, producing shear deformation of the lattice traversed by their motion. While this coupling effect has been well confirmed for symmetrical tilt GBs, little is known about the coupling ability of asymmetrical boundaries. In this work we apply a combination of molecular dynamics and phase field crystal simulations to investigate stress-driven motion of asymmetrical GBs between cubic crystals over the entire range of inclination angles. Our main findings are that the coupling effect exists for most of the asymmetrical GBs and that the coupling factor exhibits a non-trivial dependence on both the misorientation and inclination angles. This dependence is characterized by a discontinuous change of sign of the coupling factor, which reflects a transition between two different coupling modes over a narrow range of angles. Importantly, the magnitude of the coupling factor becomes large or divergent within this transition region, thereby giving rise to a sliding-like behavior. Our results are interpreted in terms of a diagram presenting the domains of existence of the two coupling modes and the transition region between them in the plane of misorientation and inclination angles. The simulations reveal some of the dislocation mechanisms responsible for the motion of asymmetrical tilt GBs. Furthermore, the results of this study compare favorably with existing experimental measurements and provide a theoretical ground for the design of future experiments.

Research Organization:
Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-07ER46400; FG02-01ER45871
OSTI ID:
1906102
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: 19 Vol. 60; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Bi-crystallographic lattice structure directs grain boundary motion under shear stress journal August 2015
Coupled grain boundary motion in aluminium: the effect of structural multiplicity journal May 2016
Scaling of alloy interfacial properties under compositional strain journal February 2016
A Study of Strain-Driven Nucleation and Extension of Deformed Grain: Phase Field Crystal and Continuum Modeling journal September 2018
A unified framework for polycrystal plasticity with grain boundary evolution preprint January 2017