THE DISTRIBUTION OF THE DEFORMATION SYSTEMS IN TENSION IN ALPHA AND ALPHA+BETA TITANIUM ALLOYS AT TEMPERATURES RANGING BETWEEN 296K-728K

摘要

The deformation behavior of α+β titanium alloys was investigated during in-situ SEM deformation. Tensile experiments were performed at temperatures between 296K and 728K (～0.4Tm). The active deformation systems were identified using an electron backscattered diffraction-based slip-trace analysis. The distribution of the active deformation systems varied as a function of temperature and microstructure. Basal and prismatic slip were the main deformation modes and the relative activity of basal slip increased with increasing temperature and decreasing strain rate. Twinning was observed in tension experiments, however no more than 11% of the grains exhibited twins. The relative amount of basal slip activity increased while twinning decreased with increasing aluminum content.