Quasi- in- situ EBSD Study on the Deformation Behavior of TiZrHf Medium Entropy Alloys with hcp Structure

TiZrHf medium entropy alloy and pure Ti with uniform equiaxed grains were successfully prepared by vacuum arc furnace melting and annealing after cold rolling. X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) results show that TiZrHf alloy and pure Ti are single-phase hcp structure with the close c/a ratio and basal texture after cold rolling and annealing. In order to compare the differences in plastic deformation mechanism between the two hcp metals, the microstructure and texture evolution during uniaxial tension were characterized by scanning electron microscope ( SEM) and electron back scattered diffraction (EBSD). The results of slip trace analysis show that compared with pure Ti, the activities of pyramidal slip and {101_ 2} tension twins in TiZrHf alloy increase significantly while the activity of {112_2} compression twins decreases.