Abstract
When the interface energy between coarsening crystals and an intervening phase is anisotropic, mechanisms that do not affect isotropic systems become important. If there are singular surfaces, then growth and dissolution must occur by the lateral motion of steps, formed at a defect center, or by two-dimensional nucleation. Here, it is shown that two-dimensional nucleation is not plausible under typical experimental conditions and that persistent step-creating defects are required for a singular surface to advance or retract during coarsening. The simultaneous presence of crystals with and without defects leads to two populations that grow at very different rates, and this provides an explanation for abnormal coarsening. The influence of extrinsic morphological changes is also considered. It is assumed that when relatively high-energy, non-equilibrium shapes in the starting materials evolve during coarsening to shapes increasingly bound by lower-energy surfaces, the mean surface energy is reduced. Simulations show that under these conditions, non-classical coarsening kinetics arise in which the rate constant decreases linearly with the mean surface energy.
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© 2005 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Solute drag illustrated graphically
- Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
- Anomalous behaviour in diffusion impedance of intercalation electrodes
- A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
- Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
- Microstructure development during liquid-phase sintering
- The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
- Three-dimensional morphological characterization of coarsened microstructures
- Faceting and migration of twin grain boundaries in zinc
- Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
- Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
- Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
- Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
- The influence of singular surfaces and morphological changes on coarsening
- Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
- Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
- Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
- The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
- Notifications/Mitteilungen
- Personal/Personelles
- Materials Week
- Conferences/ Konferenzen
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Solute drag illustrated graphically
- Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
- Anomalous behaviour in diffusion impedance of intercalation electrodes
- A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
- Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
- Microstructure development during liquid-phase sintering
- The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
- Three-dimensional morphological characterization of coarsened microstructures
- Faceting and migration of twin grain boundaries in zinc
- Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
- Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
- Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
- Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
- The influence of singular surfaces and morphological changes on coarsening
- Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
- Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
- Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
- The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
- Notifications/Mitteilungen
- Personal/Personelles
- Materials Week
- Conferences/ Konferenzen