Abstract: With TiH, powder as raw material, vacuum sintering was carried out after cold isostatic pressing. There were pores in the microstructure of sintered billet, whose relative density was 98% , and theaverage grain size was > 50 m. In order to refine the microstructure of sintered billet and improve themechanical properties, mixed hydrogen containing argon with the ratio of H,: Ar = 1:5 was introducedbefore dehydrogenation sintering, and the hydrogen partial pressure was 16 887. 5 Pa. After sintering, thedensity of pure titanium was greater than 99% and the average grain size was  25 pm. Compared withvacuum sintering, the average tensile strength was increased by 47% and the average elongation in-creased by 33% ; compared with ASTM B348-10 standard, the average tensile strength was increased by10% ，and the elongation increased by 20% .

Key words:  TiH₂powder, atmosphere sintering, vacuum sintering, eutectoid phase transformation