2017 Fiscal Year Final Research Report
Ductility improvement mechanism of pure titanium sintered materials with hydrogen and their strengthening behavior by hybrid texture formation
| Project/Area Number |
15K14182
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Material processing/Microstructural control engineering
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2015-04-01 – 2018-03-31
|
| Keywords | 粉末冶金 / 純チタン / 水素 / 集合組識 / 相変態 / 塑性加工 |
|---|
| 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.
|
| Free Research Field |
粉末冶金
|
