关键词: TiH₂粉:烧结, 旋锻, 塑性指标:纯钛

Abstract: Using TiH₂ powder as raw material, pure titanium with relative density more than 95% can beobtained through forming and one-step sintering. The elongation is 6. 67% and reduction of area is 2. 97%. In order to improve its plasticity index, the pure titanium bar with diameter of 5mm was pre-pared by rotary forging from the sintered bar with diameter of 20 mm x 200 mm. The tensile strength, e-longation and area reduction of the annealed bar were 431.26 MPa, 26% and 38.53% respectively. Theplasticity index of the annealed bar was 70% higher than that of the sintered bar, but slightly lower thanthat of the purchased annealed bar. Rotary forging provides a strong three-dimensional compressivestress. The micro pores and micro cracks in the sintered billets are not easy to gather and expand intomacro cracks, and the deformation mode which extends along with the two-way compression is easy to be-come less harmful line defects, and the material shaping is significantly improved.

Key words:  TiH₂ powder, sintering, rotary swaging, plasticity index, pure titanium