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SUMMARY:SwissMech Seminar: The austenite/martensite interface: structure\,
  kinetics\, transformation strain. Toughening: theory and experiment
DTSTART:20221110T160000
DTEND:20221110T170000
DTSTAMP:20260916T053148Z
UID:988142fff64583d19aa6c7a1a189cc4c2838ec8ae451643adb6a2b3e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. William Curtin Laboratory for Multiscale Mechanics Model
 ing\, EPFL Lausanne\nSWISSMECH SEMINAR\nAbstract: In next-generation high
 -strength/high-toughness steels\, the austenite/martensite (fcc/bcc) inter
 face is the dominant microstructural feature controlling important propert
 ies. In spite of decades of research\, the fundamental structure\, mechani
 sm of motion\, and transformation strain due to this interface have remain
 ed uncertain.  Here\, an atomistic fcc-bcc iron interface is constructed 
 that completely matches experimental observations and reveals a defect str
 ucture differing from longstanding theory assumptions while also violating
  conditions believed essential for a glissile interface.  Based on this i
 nterface\, we develop a new crystallographic double-shear theory of lath m
 artensites that provides predictions in near-perfect agreement with both s
 imulations and experiments.  In a classic Fe-Ni-Mn alloy\, we then use in
 -situ high resolution digital image correlation to measure the transformat
 ion strain and confirm the parameter-free theory.  The theory predicts in
 creasing the fcc/bcc lattice parameter ratio increases the transformation 
 strain\, which is validated with literature data and then provides a new p
 ath for developing tougher high-strength steels.\nA. Curtin\, F. Maresca\,
  E. Polatidis\, M. Smid\, H. Van Swygenhoven
LOCATION:https://ethz.zoom.us/j/94817809233?pwd=N0pzbnQwSFFTQnVPcVR3SkNrd2
 9OQT09
STATUS:CONFIRMED
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