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Published online by Cambridge University Press: 15 February 2011
The flow stress of Al-rich γ-TiAl peaks at a temperature located between about 600°C and 1000°C. We present mechanical data on samples oriented so as to deform on a <011]{111} system in single slip. These data are complemented by TEM observations in samples strained at selected temperatures (RT, 400°C, 600°C and 800°C). The present paper addresses (i) properties of dislocation organisation, (ii) the dissociation mode of <110] dislocations, (iii) locking properties of <110] dislocations and (iv) the formation of faulted dipoles.