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Deformation of lamellar TiAl alloys by longitudinal twinning

Published version
Peer-reviewed

Repository DOI


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Authors

Edwards, TEJ 
Di Gioacchino, Fabio  ORCID logo  https://orcid.org/0000-0003-2056-1510
Muñoz-Moreno, R 
Clegg, WJ 

Abstract

© 2016 Elsevier Ltd. 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.

Description

Keywords

Titanium aluminide, Twinning, Microindentation, Electron backscattering diffraction (EBSD), Digital image correlation

Journal Title

Scripta Materialia

Conference Name

Journal ISSN

1359-6462

Volume Title

118

Publisher

Elsevier
Sponsorship
Engineering and Physical Sciences Research Council (EP/M005607/1)
Engineering and Physical Sciences Research Council (EP/H500375/1)
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.