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Core properties of dislocations in YCu and YAg B2 intermetallic compounds

TitleCore properties of dislocations in YCu and YAg B2 intermetallic compounds
Publication TypeJournal Article
Year of Publication2010
AuthorsChen Q, Ji M, Wang CZ, Ho KM, Biner SB
Journal TitleIntermetallics
Volume18
Pages312-318
Date Published03/01
ISBN Number0966-9795
Accession NumberISI:000274970700003
Keywordsab initio calculations, alloys, cross-slip, defects: dislocation geometry and arrangement, dissociation, energy, mechanical-properties, NIAL SINGLE-CRYSTALS, peierls-nabarro model, rare-earth intermetallics, simulations, stability
Abstract

In this study, the dissociation and core properties of dislocations with the Burgers vectors [111] and [100] in YCu and YAg B2 rare-earth intermetallic compounds were investigated by utilizing the generalized Peierls-Nabarro model. The results are compared with those seen for the common B2 intermetallic alloy MAL The results indicate that the dislocations with the Burgers vector [111] in the three intermetallics exhibit similar dissociation characteristics and the core sizes. On the other hand, owing to the lower stacking fault energy along the [100] direction in YAg and YCu, the dislocations with the Burgers vector [100] show a different dissociation in comparison to those seen in NiAl, indicating an easier activation of the [100] slip modes in YCu and YAg. (C) 2009 Elsevier Ltd. All rights reserved.
URL<Go to ISI>://000274970700003
DOIDoi 10.1016/J.Intermet.2009.08.001