| Project/Area Number |
04640341
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
ONO Fumihisa OKAYAMA UNIVERSITY,FACULTY OF SCIENCE,PROFESSOR, 理学部, 教授 (00005406)
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| Co-Investigator(Kenkyū-buntansha) |
MAETA Hiroshi JAPAN ATOMIC ENERGY RESEARCH INSTITUTE,DEPARTMENT OF MATERIAL RESEARCH,HEAD OF L, 材料研究部, 室長
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | INVAR ALLOYS / LATTICE DISTORTION / PREMARTENSITIC TRANSFORMATION / X-RAY DIFFUSE SCATTERING / AMORPHOUS ALLOY / ION IRRADIATION |
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| Research Abstract |
Measurements of the X-ray diffuse scattering in typical Fe-base three Invar alloys ; Fe-Ni, Fe-Pt and Fe-Pd alloys were made.In Fe-Pt Invar alloy no anomaly in diffuse scattering was observed.In Fe-Pd Invar alloy a disc shape diffuse scattering was observed.In Fe-Ni Invar alloy a streek-like anomalous diffuse scattering was observed along Oll-direction.The origin of this anomaly is found to be caused by a shear stress along Oll-plane which is generated through the magnetovolume effect by small displacements of Fe atoms in a small local region where the Fe concentration is rich and the state is just before the martensitic transformation from fcc to bee phase takes place at low temperature.This type of small displacement was not detected by using any other method, and only the present X-ray diffuse scattering measurement has been successful to observe it through the large magnetovolume effect of Fe atoms, which is explained by using a ferromagnetic band theory of 3d electrons.
The effect of ion beam irradiations on fe-base amorphous ferromagnetic alloys has been investigated, and an improvement of soft magnetic properties, such as high permeability and low coercivity, has been observed at an early stage of the irradiations.This result was explained as a competition of induced magnetic anisotropy with the original one which an amorphous alloy is inherited at the stage of rapid quenching.
Furthermore, from the magnetic measurements under high pressures, magnetic atoms under the same condition as interstitial atoms show a large magnetovolume effect.This result was also explained by the ferromagnetic band theory of 3d electrons.
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