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SUMMARY:Insights Into Nanocrystalline Grain Growth Through Phase Field Cry
 stal Calculations
DTSTART:20150330T131500
DTEND:20150330T141500
DTSTAMP:20260916T153535Z
UID:2a73e78ce1981d35fe80cff4dab61e5a549cd22b5375163ccb0fe777
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Peter Voorhees\, Northwestern University\, Evanston\, US
 A\nPhase field crystal (PFC) models have been used to describe a wide rang
 e of phenomena from grain growth to solidification and dislocation motion 
 in crystals.  The strength of the method lies in its ability to follow th
 e atomic scale motion and defect formation that accompanies a process that
  occurs on diffusive timescales. An introduction to the phase field crysta
 l method will be given [1]. Using the PFC approach\, the evolution of the 
 dislocation structure of non-planar grain boundaries\, the local atomic di
 splacements of atoms near the boundary\, and the long-range strain fields 
 that accompany grain growth have been examined. We find that the atomic-sc
 ale structure of the boundary gives rise to qualitatively new grain growth
  kinetics [2] and to both grain rotation and translation. The grain transl
 ation is a result of the climb and glide of dislocations\, as well as inte
 ractions between the dislocations that comprise the grain boundary and tho
 se at the trijunctions.  Finally\, the effect of temperature and vacancy 
 concentration on grain growth will be discussed. \n[1] K. Provatas and K.
  Elder\, Phase Field Methods in Materials Science and Engineering\, Wiley-
 VCH 2012.\n[2] K.A. Wu and P.W. Voorhees\, Acta Mater.\, 60 (2012) 407-419
 .\nBio: Peter Voorhees is the Frank C. Engelhart Professor of Materials Sc
 ience and Engineering at Northwestern University\, and Professor of Engine
 ering Sciences and Applied Mathematics.  He is co-director of the Northwe
 stern-Argonne Institute of Science and Engineering and is co-director of t
 he Center for Hierarchical Materials Design. He received his Ph.D. in Mate
 rials Engineering from Rensselaer Polytechnic Institute.  He was a member
  of the Metallurgy Division at the National Institute for Standards and Te
 chnology 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 (Silv
 er 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 Researche
 r by the Institute for Scientific Information. Professor Voorhees is a fel
 low of ASM International\, the Minerals\, Metals and Materials Society\, a
 nd the American Physical Society. He has published over 200 papers in the 
 area of the thermodynamics and kinetics of phase transformations.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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