Deformation of lamellar TiAl alloys by longitudinal twinning. (June 2016)

• Record Type: Journal Article
• Authors: Edwards, Thomas Edward James; Di Gioacchino, Fabio; Muñoz-Moreno, Rocío; Clegg, William John
• Is Part Of: Scripta materialia. Volume 118(2016)
• Page Start: 46
• Page End: 50
• Publication Date: 2016-06
• Subjects: Titanium aluminide -- Twinning -- Microindentation -- Electron backscattering diffraction (EBSD) -- Digital image correlation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.03.004
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The occurrence of longitudinal twinning in the engineering alloy Ti-45Al-2Nb-2Mn (at.%)-0.8 vol.% TiB2 has been studied by measuring the changes in crystallographic orientation within individual lamellae during microcompression. Twinning in this alloy appeared to be a nucleation-limited process with the twins growing from lamellar boundaries at resolved shear stresses as low as 100 MPa, consistent with observations elsewhere. However, instead of forming twins ~ 10–200 nm in thickness, as in polysynthetically twinned crystals, the longitudinal twins in this alloy were initiated at a lamellar boundary and then spread through the whole lamella. Graphical abstract: