Insights Into Nanocrystalline Grain Growth Through Phase Field Crystal Calculations
Event details
| Date | 30.03.2015 |
| Hour | 13:15 › 14:15 |
| Speaker | Prof. Peter Voorhees, Northwestern University, Evanston, USA |
| Location | |
| Category | Conferences - Seminars |
Phase field crystal (PFC) models have been used to describe a wide range of phenomena from grain growth to solidification and dislocation motion in crystals. The strength of the method lies in its ability to follow the atomic scale motion and defect formation that accompanies a process that occurs on diffusive timescales. An introduction to the phase field crystal method will be given [1]. Using the PFC approach, the evolution of the dislocation structure of non-planar grain boundaries, the local atomic displacements of atoms near the boundary, and the long-range strain fields that accompany grain growth have been examined. We find that the atomic-scale structure of the boundary gives rise to qualitatively new grain growth kinetics [2] and to both grain rotation and translation. The grain translation is a result of the climb and glide of dislocations, as well as interactions between the dislocations that comprise the grain boundary and those at the trijunctions. Finally, the effect of temperature and vacancy concentration on grain growth will be discussed.
[1] K. Provatas and K. Elder, Phase Field Methods in Materials Science and Engineering, Wiley-VCH 2012.
[2] K.A. Wu and P.W. Voorhees, Acta Mater., 60 (2012) 407-419.
Bio: Peter Voorhees is the Frank C. Engelhart Professor of Materials Science and Engineering at Northwestern University, and Professor of Engineering Sciences and Applied Mathematics. He is co-director of the Northwestern-Argonne Institute of Science and Engineering and is co-director of the Center for Hierarchical Materials Design. He received his Ph.D. in Materials Engineering from Rensselaer Polytechnic Institute. He was a member of the Metallurgy Division at the National Institute for Standards and Technology until joining the Department of Materials Science and Engineering at Northwestern University in 1988. He has received numerous awards including the National Science Foundation Presidential Young Investigator Award, ASM International Materials Science Division Research Award (Silver Medal), the TMS Bruce Chalmers Award, the ASM J. Willard Gibbs Phase Equilibria Award, the McCormick School of Engineering and Applied Science Award for Teaching Excellence, and is listed as a Highly Cited Researcher by the Institute for Scientific Information. Professor Voorhees is a fellow of ASM International, the Minerals, Metals and Materials Society, and the American Physical Society. He has published over 200 papers in the area of the thermodynamics and kinetics of phase transformations.
[1] K. Provatas and K. Elder, Phase Field Methods in Materials Science and Engineering, Wiley-VCH 2012.
[2] K.A. Wu and P.W. Voorhees, Acta Mater., 60 (2012) 407-419.
Bio: Peter Voorhees is the Frank C. Engelhart Professor of Materials Science and Engineering at Northwestern University, and Professor of Engineering Sciences and Applied Mathematics. He is co-director of the Northwestern-Argonne Institute of Science and Engineering and is co-director of the Center for Hierarchical Materials Design. He received his Ph.D. in Materials Engineering from Rensselaer Polytechnic Institute. He was a member of the Metallurgy Division at the National Institute for Standards and Technology until joining the Department of Materials Science and Engineering at Northwestern University in 1988. He has received numerous awards including the National Science Foundation Presidential Young Investigator Award, ASM International Materials Science Division Research Award (Silver Medal), the TMS Bruce Chalmers Award, the ASM J. Willard Gibbs Phase Equilibria Award, the McCormick School of Engineering and Applied Science Award for Teaching Excellence, and is listed as a Highly Cited Researcher by the Institute for Scientific Information. Professor Voorhees is a fellow of ASM International, the Minerals, Metals and Materials Society, and the American Physical Society. He has published over 200 papers in the area of the thermodynamics and kinetics of phase transformations.
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Practical information
- General public
- Free
Organizer
- Fabien Sorin
Contact
- Fabien Sorin