10.17863/CAM.11807
Edwards, Thomas
0000-0002-3089-0062
di, Gioacchino Fabio
Muñoz-Moreno, Rocío
Clegg, William
Deformation of lamellar TiAl alloys by longitudinal twinning
Apollo - University of Cambridge Repository (staging)
2016
titanium aluminide
twinning
microindentation
electron backscattering diffraction (EBSD)
digital image correlation
Apollo - University of Cambridge Repository (staging)
Apollo - University of Cambridge Repository (staging)
2016-03-24
Article
1359-6462
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 this alloy were initiated at a lamellar boundary and then spread through the whole lamella.
The work was supported by the EPSRC / Rolls-Royce Strategic Partnership (EP/H500375/1). Alberto Palomares Garcia, Claire Davis and Robert Jones are acknowledged for discussions and help with the TEM respectively.
This is the final version of the article. It first appeared from Elsevier via https://doi.org/10.1016/j.scriptamat.2016.03.004