Low Cycle Fatigue and Cyclic Deformation of TiAl Alloys
The relation between microstructural parameters, microscopic cyclic deformation mechanisms and macroscopic cyclic strain hardening is investigated in the case of a heat treated PM Ti-48Al-2Cr-2Nb alloy at 20°C and at 500°C. In particular it is shown that, for the different microstructures considered, a moderate hardening is related to the formation of highly tangled dislocation structures which is in turn controlled by the dislocation glide mean free path. At 500°C this structures evolves towards a braid like structure for the fine fully lamellar microstructure.
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
G. Hénaff et al., "Low Cycle Fatigue and Cyclic Deformation of TiAl Alloys", Materials Science Forum, Vols. 638-642, pp. 1324-1329, 2010