Introducing dislocations locally in Al-supersaturated α2-Ti3Al single crystal via nanoscale wedge indentation. (October 2019)

• Record Type: Journal Article
• Authors: Wei, Daixiu; Koizumi, Yuichiro; Nagasako, Makoto; Kubota, Yusuke; Aoyagi, Tomoyuki; Nakagawa, Yuki; Yoshino, Masahiko; Chiba, Akihiko; Kato, Hidemi
• Is Part Of: Intermetallics. Volume 113(2019:Oct.)
• Publication Date: 2019-10
• Subjects: Titanium aluminide -- Wedge indentation -- Plastic deformation -- Anisotropic -- Dislocation; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2019.106557
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: We investigated the nanoscale anisotropic deformation behavior of Al-supersaturated α2 -Ti3 Al single crystals, using wedge indentation with the loading axis parallel to the (0001) α2 basal plane. The deformability, plastic deformation mechanism, and introduced dislocation structures beneath the indentations were notably affected by the inclination angle between the indenter edge and basal plane. Notably, abnormal dislocation bands were introduced when the edge was parallel to the (0001) plane, which can potentially be utilized for manipulating the phase decomposition locally. The present study sheds light on the regulation of local plastic deformation and manipulation of nanoscale phase transformation in metals and alloys. Graphical abstract: Image 1 Highlights: The local deformation behavior of Al-supersaturated α2 -Ti3 Al single crystals was firstly investigated by wedge indentation. The deformation behavior is notably affected by the orientation relationship between indenter and basal plane of crystal. Regulated periodic basal dislocations for manipulating phase decompositions is successfully introduced.