2013
DOI: 10.1063/1.4821956
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Growth of deformation twins in tantalum via coherent twin boundary migration

Abstract: In order to investigate the process of twinning growth, the nucleation of twinning dislocation loops on the coherent boundary of a Tantalum twin superlattice is studied via a molecular dynamics approach. We get homogeneous nucleation rates by means of a stationarity test and the mean first-passage method. We study their dependence on driving force and temperature in a framework given by the Kolgomorov-Johnson-Mehl-Avrami (KJMA) theory. Correspondingly, the contribution to the twinning growth dictated by this n… Show more

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Cited by 9 publications
(3 citation statements)
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“…Twinning in BCC metals is complex [67e69], but there are several atomistic studies for BCC metals describing twin growth [70,71], and twin nucleation from grain boundaries [72,73]. In our simulations, twinning is closely related to dislocation emission from voids and their reactions [46].…”
Section: Resultsmentioning
confidence: 89%
“…Twinning in BCC metals is complex [67e69], but there are several atomistic studies for BCC metals describing twin growth [70,71], and twin nucleation from grain boundaries [72,73]. In our simulations, twinning is closely related to dislocation emission from voids and their reactions [46].…”
Section: Resultsmentioning
confidence: 89%
“…One source of improvement could include results from MD simulations to guide the development of twinning kinetic equations that incorporate both nucleation and growth 33 . Since it appears that the dislocation evolution is important to twinning, it would be expected that the results would be sensitive to the nucleation and growth kinetics of the twining as well.…”
Section: B Dislocation Multiplication Ratementioning
confidence: 99%
“…[ 13 , 14 , 15 , 16 , 17 ]. Recently, the nucleation of DLs on the CTB of nanotwinned (nt) Ta under shear stress was studied by Sandoval et al using MD simulations [ 18 ], but how a DL interacts with the CTB in the nt BCC metal is still unclear. Thus, it should be essential and significant to explore the underlying mechanisms of the interaction between incident DL and CTB to understand the plastic deformation of the BCC metals with mirror-symmetry GBs.…”
Section: Introductionmentioning
confidence: 99%