Phase Transformations in Ti-15w/OMo-3w/oAl

The effect of additional alloying elements on the decomposition of metastable beta titanium alloys during isothermal aging has received much attention for the past few years. Aluminum, which is an a-stabilizer, was shown to effectively retard the formation of ω-phase and accelerate 𝛂-nucleation. It was proposed by previous investigators that complete suppression of ω-phase in titanium alloys, with large amounts of the alloying elements, leads to the decomposition of ω-phase through an intermediate phase separation reaction. In the present studies, phase transformations in Ti-15w/oMo-3w/oAl were investigated using X-ray diffraction and transmission electron microscopy.