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DTSTAMP:20210916T132450Z
LOCATION:Michel Mayor
DTSTART;TZID=Europe/Stockholm:20210706T143000
DTEND;TZID=Europe/Stockholm:20210706T150000
UID:submissions.pasc-conference.org_PASC21_sess135_msa335@linklings.com
SUMMARY:Understanding Plasticity Contributions during Shock Compression of
  BCC Metals at the Mesoscales
DESCRIPTION:Minisymposium\n\nUnderstanding Plasticity Contributions during
  Shock Compression of BCC Metals at the Mesoscales\n\nDONGARE, Galitskiy, 
 Ma, Mishra\n\nThe deformation behavior of BCC-based microstructures under 
 dynamic loading is determined by an interplay between dislocation slip, tw
 inning, and in some cases, the phase transformation behavior. While molecu
 lar dynamics (MD) simulations can investigate this behavior at the atomic 
 scales, the understanding of the role of slip vs. twinning vs. phase trans
 formation on the shock response is still in infancy. A novel mesoscale mod
 eling method called quasi-coarse-grained dynamics (QCGD) is used to model 
 the deformation behavior BCC microstructures. The QCGD simulations extend 
 the capability of molecular dynamics simulations to the mesoscales by redu
 cing the number of atoms being modeled in an atomic scale microstructure u
 sing representative atoms and scaled interatomic potentials. The QCGD fram
 ework reproduces the MD-predicted kink-pair mechanisms of screw dislocatio
 n motion and hence the temperature-dependent mobilities and the twinnabili
 ty of BCC systems. This talk will demonstrate the capability of QCGD simul
 ations to investigate the evolution of microstructure during shock compres
 sion and dynamic failure of BCC microstructures at the mesoscales. The QCG
 D simulations are able to reproduce the mechanisms of twinning and detwinn
 ing behavior in Ta systems as well as the phase transformation and reverse
  transformation behavior in Fe systems during shock compression/release. I
 n addition, QCGD simulations are carried out to investigate the role of tw
 inning during void recompression and dynamic recrystallization behavior in
  Ta systems, as well as the role of phase transformation variants on the d
 istribution of twins in shock recovered Fe systems at the mesoscales.\n\nD
 omain: Chemistry and Materials, Physics, Engineering
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