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cond-mat
Abstract: There is growing interest in promoting deformation twinning for plasticity inadvanced materials, as highly organized twin boundaries are beneficial tobetter strength-ductility combination in contrast to disordered grainboundaries. Twinning deformation typically involves the kinetics of stackingfaults, its interaction with dislocations, and dislocation - twin boundaryinteractions. While the latter has been intensively investigated, the dynamicsof stacking faults has been less known. In this work, we report several newinsights on the stacking fault behavior in twin induced plasticity from ourmeta-atom molecular dynamics simulation: The stacking fault interactions aredominated by dislocation reactions taking place spontaneously, different fromthe proposed mechanism in literatures; The competition among generating asingle stacking fault, a twinning partial and a trailing partial dislocation isdependent on a unique parameter, i.e. stacking fault energy, which in turndetermines deformation twinning behaviors. The complex twin-slip andtwin-dislocation interactions demonstrate the dual role of deformation twins asboth dislocation barrier and storage, potentially contributing to the highstrength and ductility of advanced materials like TWIP steels where deformationtwinning dominated plasticity accounts for the superb strength-ductilitycombination.
Submission history
From: Hongtao Wang [view email][v1]Sun, 3 Apr 2016 01:03:50 UTC (3,992 KB)
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