Grain boundary order-disorder transitions

The conditions for grain boundary (GB) structural transitions are determined from a diffuse interface model that incorporates structural disorder and crystallographic orientation. A graphical construction and numerical calculations illustrate the existence of a first-order GB order-disorder transiti...

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Bibliographic Details
Published in:Journal of materials science 2006-12, Vol.41 (23), p.7691-7695
Main Authors: MING TANG, CARTER, W. Craig, CANNON, Rowland M
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Crystallography
Defects and impurities in crystals
microstructure
Diffusion
Exact sciences and technology
Grain and twin boundaries
Grain boundaries
Liquids
Materials science
Mathematical models
Melting
Melting points
Order disorder
Order-disorder transformations
Phase diagrams
Phase transitions
Physics
Structure of solids and liquids
crystallography
Vapor phases
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Summary:The conditions for grain boundary (GB) structural transitions are determined from a diffuse interface model that incorporates structural disorder and crystallographic orientation. A graphical construction and numerical calculations illustrate the existence of a first-order GB order-disorder transition below the bulk melting point. When thermodynamic conditions permit their existence, disordered GB structures tend to be stable at higher temperatures and are perfectly wet by liquid at the melting point, while ordered grain boundaries are meta-stable against preferential melting. We calculate GB phase diagrams which are analogous to those for liquid-vapor phase transitions.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-0608-4