A simple dislocation model of the influence of high-angle boundaries on the deformation behavior of ultrafine-grained materials

W. Blum, P. Eisenlohr

Research output: Contribution to journalArticle

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Abstract

The deformation resistance of ultrafine-grained (UFG) materials is modelled on the basis of the evolution of the average dislocation density with strain in the course of glide and recovery of dislocations. In contrast to materials with conventional grain size (CG), dislocations are stored and annihilated solely at the high-angle boundaries, where screw dislocations glide and edge dislocations climb towards annihilation sites. The high-angle boundaries enhance both the rates at which dislocations are stored and recovered. Depending on the spacing of high-angle boundaries, temperature and strain rate, UFG materials are softer or harder than their CG counterparts.

Original languageEnglish (US)
Article number012136
JournalJournal of Physics: Conference Series
Volume240
DOIs
StatePublished - 2010
Externally publishedYes

Profile

grain size
screw dislocations
edge dislocations
strain rate
recovery
spacing
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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AB - The deformation resistance of ultrafine-grained (UFG) materials is modelled on the basis of the evolution of the average dislocation density with strain in the course of glide and recovery of dislocations. In contrast to materials with conventional grain size (CG), dislocations are stored and annihilated solely at the high-angle boundaries, where screw dislocations glide and edge dislocations climb towards annihilation sites. The high-angle boundaries enhance both the rates at which dislocations are stored and recovered. Depending on the spacing of high-angle boundaries, temperature and strain rate, UFG materials are softer or harder than their CG counterparts.

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