| Project/Area Number |
21760564
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
SOMEKAWA Hidetoshi National Institute for Materials Science, 新構造材料センター, 主任研究員 (50391222)
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| Project Period (FY) |
2009 – 2010
|
| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 破壊 / マグネシウム / 双晶 / 転位 / 変形組織観察 / 有限要素解析 / 破壞 |
|---|
| Research Abstract |
The deformed microstructural observations at the beginning of the three-point bending toughness test showed that the microstructure at the head of the crack-tip composed of high-angle grain boundaries changed to that of sub-grain boundaries without any deformation twins. The prevention of twin formation led to an improvement of fracture toughness in magnesium and its alloys, since the deformation twins generally become the crack-propagation site. On the other hand, the dimple formed region showed the formation of not only sub-grain boundaries but also nano-ordered twins. The reason for the nano-ordered twin formation is that the stress to cause the particle cracking and/or interface fracture is much higher than that to form the twins.
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