| Budget Amount *help |
¥28,600,000 (Direct Cost: ¥22,000,000、Indirect Cost: ¥6,600,000)
Fiscal Year 2015: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2014: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2013: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
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| Outline of Final Research Achievements |
To clarify high-strength and ductility mechanism of pure Ti material with small additive hydrogen, TiH2 raw powder was consolidated by sintering and hot extrusion. The residual hydrogen content depended on the sintering temperature, and affected on α/β phase transformation during extrusion. In case of 0.33 mass% hydrogen content, α→β phase transformation completely occurred at 1073 K, and resulted in <0001>α texture formation of extruded Ti material. This texture was never observed in the conventional extruded Ti materials (<10-10>α texture) with few hydrogen elements. The former indicated high tensile strength (σ) of 959 MPa and elongation (δ) of 27.6% compared to PM pure Ti materials with σ=634 MPa and δ=29.9%. In-situ SEM observation on the hydride dispersoids in PM Ti material indicated that they could be obviously deformed in tensile and had a ductile property at room temperature.
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