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SUMMARY:Enhanced structural evolution in the dynamic plasticity of fcc met
 als - Lewis Lea\, SMF Group\, Cavendish Laboratory
DTSTART:20170518T150000Z
DTEND:20170518T160000Z
UID:TALK70957@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Above true strain rates of 10^4 ^s^−1^\, fcc metals begin 
 to exhibit a rapid increase in strength. Attempts at modelling this transi
 tion have led to two general theories as to the underlying mechanisms. Fir
 stly\, the drift velocity of the dislocations imparting strain has been pr
 oposed to become limited by viscous-like scattering with phonons in the me
 tal. Meanwhile\, other authors have proposed that the ever-reducing timesc
 ale of slip gives rise to changes in the evolution of dislocation structur
 e. Regardless of the chosen mathematical framework\, the fundamental natur
 es of the two proposed mechanisms provide testable qualitative predictions
  about material behaviour. Measurements of a pure copper show the strength
 ening to arise from increased rates of work hardening\, a phenomenon which
  has received little theoretical attention.
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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