| Project/Area Number |
08455292
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Osaka University |
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Principal Investigator |
SABURI Toshio Osaka University, Faculty of Engineering, Professor, 工学部, 教授 (40029020)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Takashi Osaka Univ., Faculty of Engineering, Assistant, 工学部, 助手 (50228912)
KAKESHITA Tomoyuki Osaka Univ., Faculty of Engineering, Associate Professor, 工学部, 助教授 (90127209)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥6,200,000 (Direct Cost: ¥6,200,000)
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| Keywords | martensitic transformation / shape memory / Ti-Ni / aging / two-way / spontaneous shape change / R-phase / actuator / Ti-Ni-Cu |
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| Research Abstract |
We intended to make clear the strength of the two-way shape memory which is known as "all-round shape memory effect (ARSME)" by obtaining a quantitative data of the performance of the "ARSME" against an externally applied stress. For this purpose, tesile deformation is more convenient than bending. Therefore, we adopted tensile method instead of bending method in aging treatment aiming for preferential alignment of the particles of Ti3Ni4 and also in testing of the performance. A Ti-51Ni (at%) alloy was prepared by induction melting and it was hotrolled. Tensile test specimens were cut from the rolled sheet. The tensile axis was chosen to be parallel to the rolling direction. The specimens were solution treated at 1123K.Then each of them was aged at 773 K for 6 ks under a specifically chosen external tensile-stress of 0,165,300 or 500 Mpa. Thermal cycling tests under various applied tensile-stresses were made on these specimens. Transmission electron microscopic observation was made for structural investigation and differential scanning calorimetry was made to see the transformation behavior. Specimens aged under external tensile-stress shrink in association with the B2*R transformation, and the amount of the shrinkage decreases with increasing stress applied in testing. These specimens do work effectively to the outside when the applied stress is between 50 and 100 MPa. In association with the R*B19' transformation, these specimens shrink when the applied stress is around 7 MPa, but elongates when it is 50 MPa or greater. Unrecoverable strain does not remain in specimens when thermal cycling is made in the temperature range which covers the B2*R transformation, but it does when thermal cycling is made in the temperature range which covers the B2*R*B18^* transformation.
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