| Project/Area Number |
63460198
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属加工(含鋳造)
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
TOKIZANE Masaharu Ritumeikan University, Mechanical Professor Engineering,, 理工学部, 教授 (50066528)
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| Co-Investigator(Kenkyū-buntansha) |
AMEYAMA Kei Ritumeikan University, Mechanical Assistant Engineering,, 理工学部, 助手 (10184243)
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | Zn-22%Al Alloy Powder / SCr420 Steel / TiNi Shape Memory Alloy / Vacuum Hot Pressing / Densification Mechanism Map / PREP Powder / Superplasticity / Pre-strain / TiNi / ホットプレス / 緻密化 / 形状記憶 / Zm-22%Al合金粉末 / 真空ホットプレス |
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| Research Abstract |
An application of superplastic behavior for the pressure sintering of the alloy powder was investigated in the present study.
As a fundamental study, the effects of the microstructure of the powder on the densification behavior during vacuum hot pressing (VHP) of Zn-22%Al alloy powder at 523 K was clarified based on the theoretical equation and densification mechanism map. Namely, the powder consists of fin microduprex structure was dencified by superplastic deformation in the limited range of relative density and applied pressure, while the powder consists of lamellar structure was densified according to the power low creep behavior.
As the first application of the fundamental knowledge mentioned above, the effects of thermomechanical treatment which performed by combination of priorball milling and vacuum hot pressing on the densification process of SCr420 steel powder produced by plasma rotating electrode process (PREP) was examined. The results showed that the densification of the thermomechanically treated powder progressed by superplastic deformation of the powder during VHP, and the compact was composed of fine grained ferrite and spheroidized cementite particles.
As the second application in the present study, we performed the examination of the densification of TiNi shape memory alloy powder produced by PREP. In this case, the densification process at temperatures from 973 to 1173 K was accelerated by prior ball milling of the powder due to considerable grain refinement. Such a grain refinement became the noticeable increase in the shape recovery strength.
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