Crack Propagation Properties and Toughening of Wrougt TiAl Alloys based on Our Design Principle
| Project/Area Number |
23360301
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TAKEYAMA Masao 東京工業大学, 理工学研究科, 教授 (30251622)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2011: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
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| Keywords | ラメラ組織 / き裂 / 靭性 / 吸収エネルギー / β-Ti相 / 伝播抵抗 / クリープ / 組織制御 / その場観察 / き裂の発生・伝播 / 塑性変形 / 加工効果 / 破壊靭性 / 破壊靱性 |
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| Research Abstract |
The effects of lamellar orientation and presence of beta-Ti phase on toughening and strengthening of TiAl alloys with lamellar microstructure using single and polycrystalline materials were systematically investigated. From the single crystal experiments, crack initiation and propagation behavior depends strongly on the lamellar orientation with shear component parallel to the loading direction, and toughening can be achieved by minimizing the component. From the polycrystalline experiments based on our design principle of the wrought alloys, the beta phase present on the lamellar colony boundaries is deformable and resistant to crack propagation, thereby effective in toughening. The creep strengths of the alloys were found to be comparable to the currently used Ni-based alloys. Thus, it is not the presence of beta phase but microstructure stability during creep that governs the creep strength.
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Report
(4 results)
Research Products
(94 results)
