SEM and EBSD were used to investigate the variant selection behaviour of the α phase in the β matrix and at the β grain boundaries in the Ti-15Mo alloy after solution treatment and aging.The results show that the solution treated specimen consists of single βgrains without any preferred orientation.In the solution treated and aged specimen,the intragranular α phase does not undergo variant selection,instead,self-accommodation occurs among α variants,leading to a cross distribution of α phase variants at 60°.The variant selection of the film-like grain boundary α phase is influenced by the misorientation of adjacent β grains.A minor misorientation causes αphase to retain a Burgers orientation relationship with β grains on either side,whereas a major misorientation affects the precipitation of the αphase due to the interface orientation.The variant selection of the grain boundary Widmanstätten microstructure relies on the nucleation site.When the nucleation takes place at the film-like grain boundary α phase,it selects the same variants as the film-like grain boundary α phase.Nonetheless,when the nucleation occurs at the interface between the film-like grain boundary α phase and the β matrix,it is influenced by both.
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