Influence of temperature and hydrostatic pressure during equal-channel angular pressing on the microstructure of commercial-purity Ti

The paper presents the results of investigations aimed at the processing ultrafine-grained (UFG) structures in commercial-purity Ti by equal-channel angular pressing (ECAP) at low temperatures (200, 300 °C). The most important processing factors influencing the formation of equiaxed UFG structures are studied. It is shown that the decrease of ECAP temperature and the increase of hydrostatic pressure in deformation zone contribute to the formation of finer grains.