2006 Fiscal Year Final Research Report Summary
Effects of grain-boundaries on high-temperature fracture discussed by experiments using double cylindrical bicrystals
| Project/Area Number |
16560607
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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 | Tokyo Institute of Technology |
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Principal Investigator |
ONAKA Susumu Tokyo Institute of Technology, Interdisciplinary raduate School of Science and Engineering, Professor, 大学院総合理工学研究科, 教授 (40194576)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Masaharu Tokyo Institute of Technology, Interdisciplinary raduate School of Science and Engineering, Professor, 大学院総合理工学研究科, 教授 (50161120)
FUJII Toshiyuki Tokyo Institute of Technology, Interdisciplinary raduate School of Science and Engineering, Associate Professor, 大学院総合理工学研究科, 助教授 (40251665)
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| Project Period (FY) |
2004 – 2006
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| Keywords | high-temperature deformation / high-temperature fracture / grain boundary / plastic deformation / crystal defects |
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| Research Abstract |
A double cylindrical bicrystal is a bicrystal consisting of a cylindrical inside grain with a second grain wrapped around its curved side surface. Using a double cylindrical bicrystal of a Cu-SiO_2 alloy, tensile tests were performed at 800K under 2×10^<-4>/s. Three specimens cut from the same bicrystal were deformed to three different strains. Preferential formation of grain-boundary cracks around the cylindrical inside grain was observed after the tensile tests. In addition to the occurrence of grain-boundary sliding, the misfit of slip deformation at the grain boundary affects the formation of the grain-boundary cracks.
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