Deformation of lamellar TiAl alloys by longitudinal twinning
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Edwards, T., Di Gioacchino, F., Muñoz-Moreno, R., & Clegg, W. (2016). Deformation of lamellar TiAl alloys by longitudinal twinning. Scripta Materialia, 118 46-50. https://doi.org/10.1016/j.scriptamat.2016.03.004
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.
External DOI: https://doi.org/10.1016/j.scriptamat.2016.03.004
This record's URL: https://www.repository.cam.ac.uk/handle/1810/254310
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