Deformation of lamellar TiAl alloys by longitudinal twinning

Thomas Edwards, Gioacchino Fabio Di, Rocío Muñoz-Moreno & William Clegg
The occurrence of longitudinal twinning in the engineering alloy Ti-45Al-2Nb-2Mn (at%)-0.8vol% 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...
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