What is the beta transus temperature in titanium alloys?

The beta transus temperature is defined as the lowest temperature at which a titanium alloy can exist in a 100-percent beta (β) phase.1

Because alloying elements significantly influence the stability of the alpha (α) and beta phases, the beta transus temperature varies based on the specific composition of the alloy. It typically ranges from 700 °C (1,300 °F) to as high as 1,050 °C (1,900 °F). In the context of titanium processing, final mechanical working and heat treatments are generally performed below this temperature to ensure the desired microstructural phase distribution and grain size.1