2003 Fiscal Year Final Research Report Summary
Development of High Speed and low Temperature Superplastic Forgeable New Cu-base Alloy with Shape Memory Ability
| Project/Area Number |
14550090
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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 |
Materials/Mechanics of materials
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| Research Institution | Sojo University |
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Principal Investigator |
MIURA Sei Sojo University, Faculty of Engineering, Professor, 工学部, 教授 (00066169)
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| Co-Investigator(Kenkyū-buntansha) |
ONO Nagato Sojo University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20258643)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Superplasticity / Forging / Cu-Zn-Sn Alloy / Grain Refining / Shape Memory Effect / Corrosion Resistant / Interphase Sliding |
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| Research Abstract |
Water supply related products, represented by faucets, had been regulated to use bronze as brass frequently becomes corrosive. In 1991, the Japan Industrial Standard (JIS) was amended, and manufacturers could have freedom in selecting the material for the faucets. Following this deregulation, we have been promoting the application of forging and high speed machining technology by utilizing marketed highly corrosive-resistant brass rods. But brass cannot be cast to form complex shapes and has no way to overcome erosion-corrosion by water flow cavity and stress corrosion cracking. We promoted technology by self developing both materials and forging technology.
As the results, the new commercial alloys based on 60Cu-40Zn were developed by controlling the microstructures and adding Sn. The new alloys have excellent hot workability, corrosion resistance and also shape memory ability by heat treatment. The net shape forging by superplastic forming was realized below 800K and the alloys can be used as superplastic corrosion resistant shape memory Cu-Zn-Sn alloys.
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