Thermoelastic behavior of structurally disordered interface materials: Homogeneous versus inhomogeneous effects
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The effects of homogeneous (temperature-induced) and inhomogeneous (interface-induced) structural disorder on the thermoelastic properties of interface materials are explored by molecular-dynamics simulation. The interface systems considered are superlattices composed of high-angle twist grain boundaries on the (100) plane of a fcc metal at various modulation wavelengths and temperatures. For comparison, the thermoelastic behavior of a perfect fcc crystal is also investigated at the same temperatures. By allowing thermal expansion in some cases, and not in other cases, the explicit effects of the thermal expansion on the elastic properties are explored. We find competing thermal effects of the atomic-level disordering on one hand and the consequent volume expansion on the other. We conclude that atomic-level structural disorder, be it homogeneous or inhomogeneous, can lead to elastic stiffening, provided that the related volume expansions do not dominate the elastic behavior and result in a softening.
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 7110252
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 46:4; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
A micromechanical framework and modified self-consistent homogenization scheme for the thermoelasticity of porous bonded-particle assemblies
Thermoelastic behavior of grain-boundary superlattices
Related Subjects
INTERFACES
THERMOELASTICITY
COMPUTERIZED SIMULATION
FCC LATTICES
GRAIN BOUNDARIES
METALS
SUPERLATTICES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELASTICITY
ELEMENTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
SIMULATION
TENSILE PROPERTIES
360606* - Other Materials- Physical Properties- (1992-)