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The influence of singular surfaces and morphological changes on coarsening

  • Gregory S. Rohrer EMAIL logo and Chang-Soo Kim
Published/Copyright: January 22, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 96 Issue 2

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.

Keywords: Coarsening; Surface energy; Nucleation; Morphology

Dedicated to Professor Dr. Duk Yong Yoon on the occasion of his 65th birthday

Gregory S. Rohrer W.W. Mullins Professor of Materials Science and Engineering Department of Materials Science and Engineering Carnegie Institute of Technology Carnegie Mellon University 5000 Forbes Ave. Pittsburgh, Pennsylvania 15213-3890 Tel.: +1 412 268 2696 Fax: +1 412 268 3113 www: www.materials.cmu.edu/rohrer

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Received: 2004-08-14
Accepted: 2004-11-11
Published Online: 2022-01-22

© 2005 Carl Hanser Verlag, München

Articles in the same Issue

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  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Solute drag illustrated graphically
  6. Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
  7. Anomalous behaviour in diffusion impedance of intercalation electrodes
  8. A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
  9. Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
  10. Microstructure development during liquid-phase sintering
  11. The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
  12. Three-dimensional morphological characterization of coarsened microstructures
  13. Faceting and migration of twin grain boundaries in zinc
  14. Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
  15. Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
  16. Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
  17. Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
  18. The influence of singular surfaces and morphological changes on coarsening
  19. Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
  20. Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
  21. Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
  22. The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
  23. Notifications/Mitteilungen
  24. Personal/Personelles
  25. Materials Week
  26. Conferences/ Konferenzen
https://doi.org/10.3139/ijmr-2005-0033
Keywords for this article
Coarsening; Surface energy; Nucleation; Morphology

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Solute drag illustrated graphically
  6. Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
  7. Anomalous behaviour in diffusion impedance of intercalation electrodes
  8. A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
  9. Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
  10. Microstructure development during liquid-phase sintering
  11. The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
  12. Three-dimensional morphological characterization of coarsened microstructures
  13. Faceting and migration of twin grain boundaries in zinc
  14. Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
  15. Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
  16. Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
  17. Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
  18. The influence of singular surfaces and morphological changes on coarsening
  19. Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
  20. Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
  21. Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
  22. The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
  23. Notifications/Mitteilungen
  24. Personal/Personelles
  25. Materials Week
  26. Conferences/ Konferenzen
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