| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Mixtures of titanium hydride (TiH2) powders and titanium dioxide (TiO2) particles were employed as starting materials. The mixtures were consolidated by using SPS process and hot extrusion. XRD analysis showed the additive TiO2 particles were thermally decomposed and were completely dissolved into Ti matrix during SPS process at 1073K for 1.8 ks. The lattice constant in c-axis increased proportional to TiO2 contents, while no remarkable changes were detected in the a-axis. Tensile testing showed that UTS and 0.2%YS increased in proportion to TiO2 content, but elongation decreased slightly with increased TiO2 content. In particular, extruded TiH2 powder material with 1.5 wt.% TiO2 particles produced 1158 MPa UTS, 946 MPa 0.2%YS and 24% elongation. Comparison to pure Ti with no additive TiO2 particle, extruded TiH2 powder material showed the decrease of ductility while improving tensile strength. These results were showed to be superior to those of the conventional Ti-6Al-4V alloy.
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