| Budget Amount *help |
¥40,170,000 (Direct Cost: ¥30,900,000、Indirect Cost: ¥9,270,000)
Fiscal Year 2019: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2018: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Fiscal Year 2016: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Outline of Final Research Achievements |
Pure titanium (α-Ti) sintered material with light element solutes such as oxygen and nitrogen successfully balanced high strength and enough ductility. To understand the mechanical improvement mechanism, the phase transformation and optimized water-quenching treatment were applied to control the oxygen solution concentration, and resulted in the ductility improvement. After optimizing the processing and heat treatment conditions based on the above results, such heterogeneously oxygen distributed microstructures effectively overcome the strength-ductility trade-off balance of cast titanium materials. Furthermore, it was predicted that the most stable structure of the solid solution oxygen atom in the α-Ti crystal was an octahedral site using first-principles calculation, and the agreement with the X-ray diffraction results was verified.
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