2010 Fiscal Year Final Research Report
Mechanical characterization of local deformation behavior in the vicinity of grain boundary
| Project/Area Number |
20560663
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | National Institute for Materials Science |
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Principal Investigator |
OHMURA Takahito National Institute for Materials Science, 新構造材料センター, 主幹研究員 (40343884)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 鉄鋼材料 / 結晶粒界 / 転位 / 力学挙動 / ナノインデンテーション / 透過電子顕微鏡 / その場観察 |
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| Research Abstract |
Nano-scale mechanical characterization was applied to grain boundary of steels and fundamental deformation behavior was analyzed to consider the mechanism of grain boundary strengthening. The critical stress for the plasticity initiation is lower for the grain boundary than that for the grain interior. Through the in-situ nanoindentation in a TEM, it was found that the flow stress dropped with drastic dislocation multiplication. There was no remarkable dislocation pile-up at the grain boundary even though the grain boundary has a large angle.
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