The Effect of Heating Rate on Discontinuous Grain Boundary Alpha Formation in a Metastable Beta Titanium Alloy

Abstract

AbstractContinuous grain boundary α ($$ \alpha_{\text{GB}} $$ α GB ) is often observed in age-hardened metastable β titanium alloys and plays a detrimental role in ductility. In this work, we show that the heating rate to the aging temperature is crucial in determining the extent of $$ \alpha_{\text{GB}} $$ α GB . The extent of $$ \alpha_{\text{GB}} $$ α GB is determined by the extent of formation of isothermal ω at grain boundaries. This new finding is significant for suppressing continuous $$ \alpha_{\text{GB}} $$ α GB formation in aging hardened β titanium alloys.