Abstract
Martensitic transformations are utilized to refine the microstructure of high Nb containing TiAl alloys by rapid quenching from β phase region. Additions of β stabilizing elements, such as Cr and V, are verified to promote the β→α martensitic transformation. The morphologic and crystallographic characteristics of martensites in Ti-42.5Al-6Nb-x(Cr, V) alloys indicate that the martensitic α has a perfect Burgers orientation relationship with the parent β phase, and the lateral size of the martensite decreases with increment of β stabilizing elements. With subsequent heat treatment, a series of refined fully lamellar (FL) and nearly lamellar (NL) microstructures can be obtained, where the FL colony size can reach 30 μm with 2 at.% Cr and 50 μm with 3 at.% V respectively.
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