Precipitate shape evolution under applied stress - Thermodynamics and kinetics
The influence of an external stress field on the growth and morphological evolution of a coherent precipitate is examined within the context of the thermodynamics of crystalline solids and interfaces. Equilibrium interfacial concentrations are obtained that are shown to be strong functions of position along the precipitate-matrix interface. These variations in concentration may be larger than the usual capillarity term and are a result of elastic considerations and not a result of changes in the local interfacial curvature. The interfacial concentrations directly influence the precipitate growth rate and result in changes in the precipitate morphology. Depending upon the signs and magnitudes of the coherency strains, the applied stress field and the elastic inhomogeneity of the system, the shape evolution may be approximated by ellipsoids of revolution.
- Research Organization:
- Dept. of Metallurgical Engineering and Materials Science, Carnegie Mellon Univ., Pittsburgh, PA (US)
- OSTI ID:
- 7021374
- Journal Information:
- Metall. Trans., A; (United States), Vol. 18A:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Computer simulation of morphological evolution and rafting of {gamma}{prime} particles in Ni-based superalloys under applied stresses
Effects of internal stresses and intermediate phases on the coarsening of coherent precipitates: A phase-field study