Abstract The effect of applied strains field on the microstructure produced during α2 phase to O-phase (orthorhombic phase) transformation in Ti-25Al-10Nb (at. %) alloy is studied by computer simulation using a phase field model. It is shown that not only the applied strain magnitude but also the applied strain direction affects the microstructure significantly. The effect of strain direction on the volume fraction of O-phase is up to 24% but strain magnitude up to 60%. The fully lamellar microstructure can be formed in Ti-25Al-10Nb alloy when the strain is loaded along <11-20> of α2 phase with magnitude greater than a half of the stress-free transformation strain.
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