| Project/Area Number |
63420045
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Physical properties of metals
|
|---|
| Research Institution | Tokyo Institute of Technology |
|---|
Principal Investigator |
SATO Akikazu Tokyo Institute of Technology The Graduate School at Department of Materials Science and Engineering Professor, 大学院・総合理工学研究科, 教授 (20089824)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KATO Masaharu Tokyo Institute of Technology The Graduate School at Department of Materials Sci, 大学院・総合理工学研究科, 助教授 (50161120)
|
|---|
| Project Period (FY) |
1988 – 1990
|
| Project Status |
Completed (Fiscal Year 1990)
|
| Budget Amount *help |
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 1990: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1988: ¥10,300,000 (Direct Cost: ¥10,300,000)
|
|---|
| Keywords | Magnetic anisotropy / Martensitic transformation / External magnetic field / Precipitation |
|---|
| Research Abstract |
The magnetic toque meter, which was the most indispensable equipment for the present study, was purchased in fall 1988. After the various preliminary tests, the equipment started to be used in the full capability in April 1989 and has been utilized to bring about many useful informations related to the present research.
The outcomes of the present research are summarized as follows. 1) In the study of "Formation of oriented Fe<@D216@>D2N<@D22@>D2 by the aging under stress of a magnetic and magnetic anisotropy of the aging products, " the following two major findings are demonstrated. First, the well developed Fe<@D216@>D2N<@D22@>D2 possesses a strong anisotropy along a cube axis so that the precipitates are oriented by a magnetic field that the Fe matrix itself possesses. In contrast, the premature nitrogen clusters formed in the early stage of aging have the easy magnetization axis inclined with respect to the cube axis so that magnetic orienting effect is not so distinct as it is foun
… More
d in the stress aged cases. Second, the premature clusters formed in the early stage of stress aging are shown to resolve back to matrix by removal of the stress, yet exhibiting complete orienting of the Fe<@D216@>D2N<@D22@>D2 after the sufficient stress-free aging. 2) In the study of "Magnetic effects on the gamma -> alpha martensitic transformation of Fe particles in a Cu alloy and magnetic anisotropy of the alpha-Fe particles embedded in a Cu-Fe alloy, " the para -> fello magnetic transformation associated with phase change from fcc to bcc is linked with the development of the magnetic anisotropy by analyzing the results of magnetic toque measurements. 3) In the study of "Magnetic effect on the gamma (] SY.dblarw.[) epsilon transformation of Fe-Mn-Si alloys, "it has been revealed that the effect of a magnetic field on the gamma -> epsilon martensitic transformation of a Fe-Mn-Si shape memory alloy is so small that no effect has been found on the stress-strain curves in the vicinity of the Neel temperature. Less
|
