2011 Fiscal Year Final Research Report
3D characterisation of microstructure around a crack tip by combining high-voltage electron microscopy and tomography.
| Project/Area Number |
22760544
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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 | Kyushu University |
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Principal Investigator |
TANAKA Masaki 九州大学, 工学研究院, 助教 (40452809)
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| Project Period (FY) |
2010 – 2011
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| Keywords | :強度・靭性・破壊 |
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| Research Abstract |
Three-dimensional structures of crack tip dislocations were observed, using electron tomography with a high-voltage electron microscope. It was calculated that the effect of elastic stress field due to the dislocations on the local stress field around the crack tip. It was elucidated that crack opening stress is applied at a part of the crack front, which becomes a new dislocation source. It was also elucidated that a certain dislocation double cross-slips ahead of the crack tip to be a Frank-Read source.
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