Three types of dislocation core structure in B2 alloys. (June 2016)

• Record Type: Journal Article
• Authors: Paidar, Václav; Čák, Miroslav
• Is Part Of: Intermetallics. Volume 73(2016:Jun.)
• Page Start: 21
• Page End: 25
• Publication Date: 2016-06
• Subjects: Intermetallics -- Mechanical properties -- Planar faults -- ab–initio calculations; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2016.02.007
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The mechanical properties are directly influenced by the properties of dislocation. In the relatively simple ordered structure of B2 type, the dislocation core structure is controlled by the stacking-fault-like defects as antiphase boundaries. It will be shown, that three types of B2 alloys can be distinguished differing by the degeneracy of antiphase-boundary-like defects energies on the {110} plane: crystallographic, two- and four-fold degenerated antiphase boundary energies. Various types of superlattice dislocation and their impact on dislocation mobility is discussed in this paper. Highlights: The stacking-fault-like defects in YAg are analysed. A mesoscopic model for dissociated total dislocations is developed. Various types of superlattice dislocation in different B2 alloys are classified. Dislocation behaviour controls ductility of B2 rare-earth alloys.