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Scale-Free Modeling of Coupled Evolution of Discrete Dislocation Bands and Multivariant Martensitic Microstructure

TitleScale-Free Modeling of Coupled Evolution of Discrete Dislocation Bands and Multivariant Martensitic Microstructure
Publication TypeJournal Article
Year of Publication2018
AuthorsLevitas, VI, Esfahani, SE, Ghamarian, I
JournalPhysical Review Letters
Volume121
Pagination6
Date Published11
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000450269000009
Keywordsconstitutive model, crystal, field microelasticity theory, high-pressure, phase-transformations, physics, shape-memory alloys, simulations, state, strain, transitions
Abstract

A scale-free model for the coupled evolution of discrete dislocation bands and multivariant martensitic microstructure is developed. In contrast to previous phase field models, which are limited to nanoscale specimens, this model allows for treating the nucleation and evolution of martensite at evolving dislocation pileups, twin tips, and shear bands in a sample of an arbitrary size. The model is applied for finite element simulations of plastic strain-induced phase transformations (PTs) in a polycrystalline sample under compression and shear. The solution explains the one to two orders of magnitude reduction in PT pressure by plastic shear, the existence of incompletely transformed stationary state, and optimal shear strain for the strain-induced synthesis of high pressure phases.

DOI10.1103/PhysRevLett.121.205701
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Alternate JournalPhys. Rev. Lett.