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11. Deformation of lamellar TiAl alloys by longitudinal twinning.

Author

Edwards, Thomas Edward James, Di Gioacchino, Fabio, Muñoz-Moreno, Rocío, and Clegg, William John

Subjects
*TITANIUM-aluminum alloys, *LONGITUDINAL method, *TWINNING (Crystallography), *COMPRESSION loads, *THICKNESS measurement
Abstract

The occurrence of longitudinal twinning in the engineering alloy Ti-45Al-2Nb-2Mn (at.%)-0.8 vol.% TiB 2 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. [ABSTRACT FROM AUTHOR]

Published
2016
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