Abstract
A transmission electron microscopic study has been carried out to characterize the microstructural features of a titanium-6 wt% aluminum-4 wt% vanadium alloy after treatments at three different solutionizing temperatures of 900°C, 955°C, and 1065°C, followed by subsequent cooling at various rates in air, furnace, or water. Solutionization at 900°C and 955°C produced duplex microstructures consisting of equiaxed α and partially transformed β phases, while solutionization at 1065°C resulted in coarse Widmanstätten structures on furnace or air cooling and a fully martensitic structure on water quenching. The present studies revealed the morphology, size and distribution of the α, β, and martensite phases and also the presence of an interface phase with an fcc structure at almost all α-β interfaces. This interface phase has a width of about 0.15 μm and occurred in all slowly cooled specimens. Selected area diffraction patterns revealed the Burgers relationship between α and β and Nishiyama-Wassermann relationship between β and γ. The martensite is typically of lath structure with alternate laths in different orientations when quenched from 1065°C but observed as a fine platelike structure when quenched from 900° and 955°C.
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