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SUMMARY:Dislocation dynamics simulations of plasticity in dispersion harde
 ned metals - Sylvain Queyreau\, Laboratoire d’Etude des Microstructures\
 , ONERA\, Chatillon\, France
DTSTART:20090507T150000Z
DTEND:20090507T160000Z
UID:TALK16786@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:In crystalline materials\, the plastic deformation is controll
 ed by the motion of dislocations\, the linear defects present in the cryst
 al and associated with a lattice distortion. The recent simulation techniq
 ue of Dislocation Dynamics (DD) is a powerful tool to investigate the disl
 ocations-dislocations interactions\, their collective behaviour and also i
 nteractions with other obstacles such as precipitates. The seminar will pr
 esent what we can learn from DD simulations (and their limitations) about 
 the plasticity of pure and alloyed materials. Ferritic steels used in extr
 eme environments such as nuclear reactor cores is taken as a first illustr
 ation. Then\, the fascinating effect discovered by Bauschinger is tackled:
  why materials are softer in compression after a first tensile loading?
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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