Formation of Deformation-Induced Products in a Metastable-β Titanium Alloy during High Temperature Compression

A metastable-beta titanium alloy, Ti-10V-3Fe-3Al (wt. %), was subjected to thermo-mechanical processing including the compression test at 725 degrees C, which is below the beta transus temperature (780 degrees C), and at strain rate of 10(-3) s(-1). The presence of phases was determined using transmission electron microscopy and X-ray diffraction. Although the dynamic recovery took place together with slip, both deformation-induced alpha" martensite and were detected as other operating mechanisms for the first time in metastable-beta titanium alloy deformed in alpha + beta region. The volume fraction of stress-induced alpha" was higher than that of the same alloy deformed at room temperature due to a higher strain applied. Stress-induced twinning was not operational, which could be related to the priority of slip mechanism at high temperature resulted from thermally-assisted nucleation and lateral migration of kink-pairs.