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SUMMARY:Harder\, Cheaper\, Greener: the Design and Deployment of Alloy Coa
 tings with Stabilized Nanocrystalline Structures
DTSTART:20131104T131500
DTSTAMP:20260610T042433Z
UID:349ec589bd60262f022b8be4015b89e117d6b39a3a36fd5537e63fe7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Christopher Schuh\, MIT\nBio: Background:\n1997 BS\, Materials
  Science and Engineering\, University of Illinois\n2001 PhD\, Materials Sc
 ience and Engineering\, Northwestern University\n2001-2002 Ernest O. Lawre
 nce Postdoctoral Fellow\, Lawrence Livermore National Laboratory\nResearch
 :\nProf. Schuh’s group uses experiments\, analytical theory\, and comput
 er simulations to explore the processing-structure-property relationships 
 in structural metals. They are particularly interested in the role of stru
 ctural disorder and its effect on mechanical properties. Their research co
 vers many length scales\, from long-range disorder in grain boundary netwo
 rks\, to the nanoscale disorder in amorphous and nanocrystalline alloys.\n
 When the grain size of a metal is refined to a scale on the order of just 
 a few nanometers\, its strength\, hardness\, wear resistance\, and other p
 roperties improve in dramatic ways. There is therefore significant interes
 t in designing and deploying such nanocrystalline alloys for structural ap
 plications. However\, refining the grain structure is a struggle against e
 quilibrium\, and nanocrystalline materials are often quite unstable\; the 
 grains grow given time even at room temperature\, and the associated prope
 rty benefits decline over time in service. In this talk\, our efforts to d
 esign a stable family of nanocrystalline alloys will be described. We rely
  on selective alloying as a method to lower the energy of grain boundaries
 \, bringing the nanocrystalline structure closer to equilibrium.  Using a
 nalytical thermodynamic mixing calculations and Monte Carlo simulations\, 
 we identify desirable alloying elements for a given base metal\, and asses
 s the relative stability of nanocrystalline structures against grain growt
 h. We then transition these mod eling principles to the laboratory\, produ
 ce materials\, and experimentally validate the modeling results. Finally\,
  the talk will review the connection between theory\, experiment\, and eng
 ineering application\, and describe a suite of commercial products based o
 n this research.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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