Abstract
Abstract The present study is concerned with nucleation and growth of α phase during heat treatment in Ti–Al–Mo–Mn intermetallic alloys processed by hot extrusion of elemental powders. TEM and X-ray diffraction analysis show that the microstructure of the as-hot extruded alloy consists of γ, α 2 and B2 phases. The volume fractions of α 2 and B2 phases are 16 and 20%, respectively, which shows that B2 phases that contain significant amounts of Mo have an orientation relationship with γ plates inside them. Microstructural evolution during heat treatment reveals that the α 2 phase nucleates and grows in lamellar form by edgewise and sidewise mechanism. Edgewise growth of the α 2 phase is more rapid than sidewise growth due to the coherent interface between α 2 and γ phases along the sidewise direction. Sidewise growth of the α 2 phase occurs by a ledge mechanism. It has been shown that α phase nucleates in γ plates located at the lamellar boundaries and grows along a direction that can produce an incoherent interface. γ phase present in the B2 phase affects the growth of the α phase by providing a preferential site for α growth.
Published Version
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