Yh. Wen et al., Influence of an applied strain field on microstructural evolution during the alpha(2) -> O-phase transformation in Ti-Al-Nb system, ACT MATER, 49(1), 2001, pp. 13-20
We investigate the influence of an applied homogeneous strain on the cohere
nt alpha (2) (DO19) to O-phase transformation in Ti-Al-Nb alloys using a ph
ase-field approach. The emphasis is on the effect of the applied strain on
the two-phase morphology, as well as the equilibrium volume fractions of di
fferent orientation domains of the O-phase. It is found that the applied ho
mogeneous strain field does not change the essential features of the morpho
logical patterns, but does alter the relative amount of each orientation do
main and the equilibrium volume fraction of the O-phase. When the applied s
train is of the same order of magnitude as the stress-free transformation s
train, the initial two-phase mixture becomes unstable and transforms into a
single O-phase. (C) 2001 Acta Materialia Inc. Published by Elsevier Scienc
e Ltd. All rights reserved.