Ductility improvement mechanism of pure titanium sintered materials with hydrogen and their strengthening behavior by hybrid texture formation
| Project/Area Number |
15K14182
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 粉末冶金 / 純チタン / 水素 / 集合組識 / 相変態 / 塑性加工 / 集合組織 |
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| Outline of Final Research Achievements |
To fabricate pure titanium (Ti) sintered materials with high strength and excellent ductility by using hydrogen element, which is one of the ubiquitous elements, the following processes were investigated; [1] direct use of TiH2 powder as starting materials, [2] in-process microstructures control via phase transformation by hydrogen atoms (β-phase stabilizer), [3] strengthening effect by α-Ti grains refinement and hybrid texture formation, and improvement ductility by deformation (tensile/compression) twins control using TiH2 needle-like compounds. For example, Ti-0.33 wt.%H sintered material showed a good balance between strength and ductility such as 0.2%YS of 990MPa, UTS of 1158 MPa and 23.9% elongation at room temperature.
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Report
(4 results)
Research Products
(7 results)
