2012 年 1 巻 6 号 p. 283-287
The applications of Ti and its alloys are limited to high-performance products because of expensive cost and poor plastic formability. In this study, pure Ti powder was consolidated by using spark plasma sintering (SPS), warm compaction and cold compaction, respectively. The mechanical properties of the hot-extruded powder metallurgy (P/M) pure Ti materials were evaluated in order to develop a cost-effective processing. The specimen prepared by warm compaction showed a higher tensile strength of 973.7 MPa and a better elongation of 26.0 % comparing with other materials. Orientation, grain refinement and solid solution strengthening mechanism were discussed respectively. Solution strengthening of oxygen was considered as the main strengthening factor in this study. The strengthening effect of solid solution of oxygen was calculated as 370.6 MPa/at.%[O] on 0.2 %YS.