| Project/Area Number |
12650663
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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 |
Physical properties of metals
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| Research Institution | Kanazawa Institute of Technology |
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Principal Investigator |
SHIMIZU Ken-ichi Kanazawa Institute of Technology, Department of Engineering, Associate Professor, 工学部, 教授 (60029832)
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| Co-Investigator(Kenkyū-buntansha) |
YAJIMA Zenjiro Kanazawa Institute of Technology, Department of Engineering, Associate Professor, 工学部, 教授 (60148145)
岸 陽一 金沢工業大学, 工学部, 講師 (70265370)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | martensitic transformation / Preference of martensite variants / lattice / invariant strain / Taylor's criterion / electron microscopy / external force effect / Fe-Ni alloy |
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| Research Abstract |
Uni-axial stress and magnetic field are directional externa forces, but temperature and hydro-static pressure are not directional ones. Therefore/ the martensite variants induced by those external forces may be different depending on the kinds of external forces, that is, those by the former external forces may be preferentially formed along the habit planes nearly parallel to the applied direction of the external forces, and those by the latter external forces may not formed with such a preference of habit planes. The shape change associated with martensitic transformations is regarded as a kind of plastic deformation, and so the Taylor's criterion for plastic deformation, where 5 slip systems mus be activated at least to deform maintaining the continuity among multi-crystals, is considered to hold during the martensitic transformation. It is thus wondered whether the preferential formation of martensite variants is truely observed or not and how the lattice invariant strain following to the Taylor's criterion changes due to the preferential variant formation. Thus, effect of external forces on the preferential varaiant formation and the lattice invariant strain have been observed by using optical, scanning electron and transmission electron microscopes for a Fi-Ni alloy.
The martensite variants induced by temperature change didn't show any preference of habit planes. But, those induced by uni-axial stress and magnetic field showed remarkable preference of habit planes, which are parallel to the applied direction of the external forces. In the case of uni-axial stress, habit planes making 45° to the applied direction of stress were also observed. Linking to the preferential formation of variants, preferential occurrence of lattic invariant strain wa also observed in the martensites induced by uni-axial stress and magnetic field.
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