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Title: From coherent to incoherent mismatched interfaces. A generalized continuum formulation of surface stresses

Journal Article · · Journal of the Mechanics and Physics of Solids
 [1]; ORCiD logo [2];  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
  3. Univ. de Lorraine, Metz (France)

The equilibrium of coherent and incoherent mismatched interfaces is reformulated in the context of continuum mechanics based on the Gibbs dividing surface concept. Two surface stresses are introduced: a coherent surface stress and an incoherent surface stress, as well as a transverse excess strain. Additionally, the coherent surface stress and the transverse excess strain represent the thermodynamic driving forces of stretching the interface while the incoherent surface stress represents the driving force of stretching one crystal while holding the other fixed and thereby altering the structure of the interface. These three quantities fully characterize the elastic behavior of coherent and incoherent interfaces as a function of the in-plane strain, the transverse stress and the mismatch strain. The isotropic case is developed in detail and particular attention is paid to the case of interfacial thermo-elasticity. This exercise provides an insight on the physical significance of the interfacial elastic constants introduced in the formulation and illustrates the obvious coupling between the interface structure and its associated thermodynamics quantities. Finally, an example based on atomistic simulations of Cu/Cu2O interfaces is given to demonstrate the relevance of the generalized interfacial formulation and to emphasize the dependence of the interfacial thermodynamic quantities on the incoherency strain with an actual material system.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1140603
Report Number(s):
SAND--2014-0605J; PII: S0022509614001628
Journal Information:
Journal of the Mechanics and Physics of Solids, Journal Name: Journal of the Mechanics and Physics of Solids Journal Issue: C Vol. 72; ISSN 0022-5096
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Correlation between vacancy formation and Σ3 grain boundary structures in nickel from atomistic simulations journal June 2016
A note on traction continuity across an interface in a geometrically non-linear framework journal April 2018
Correlation between vacancy formation and Σ3 grain boundary structures in nickel from atomistic simulations text January 2016
Correlation between vacancy formation and Σ3 grain boundary structures in nickel from atomistic simulations text January 2016
Revisiting the Application of Field Dislocation and Disclination Mechanics to Grain Boundaries journal November 2020
Bounds on size effects in composites via homogenization accounting for general interfaces journal June 2019
Semicoherent oxide heterointerfaces: Structure, properties, and implications journal October 2019
Aspects of interface elasticity theory journal April 2017
A primer on selecting grain boundary sets for comparison of interfacial fracture properties in molecular dynamics simulations journal August 2017
Variational formulation of generalized interfaces for finite deformation elasticity journal July 2017

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