Phase Transformation at Oral Enviromental Temperature in CuAu-ln Alloys
| Project/Area Number |
09671997
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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 |
補綴理工系歯学
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| Research Institution | Nagasaki University |
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Principal Investigator |
KUNIHIRO Hisatsune Nagasaki University School of Dentistry Professor, 歯学部, 教授 (20037526)
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| Co-Investigator(Kenkyū-buntansha) |
HASAKA Masayuki Nagasaki University Faculty of Engineering Professor, 工学部, 教授 (30039698)
UDOH Koh-ichi Nagasaki University School of Dentistry Research Associate, 歯学部, 助手 (60145266)
TANAKA Yasuhiro Nagasaki University School of Dentistry Research Associate, 歯学部, 助手 (10217086)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | Gold alloy / Phase transformation / Superlattice / Age-hardening / Antiphase domain / Transmission electron microscopy / Electrical resistivity / X-ray diffraction |
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| Research Abstract |
Age-hardening behaviors in CuAu-ln alloys were studied by means of electrical resistivity measurements, hardness tests, X-ray diffraction and transmission electron microscopy. Main results are as follows
1 Indium addition in equiatomic CuAu alloy produced remarkable decrease in the critical temperature of CuAu land CuAu II ordered phases and reduced the ordering rate.
2. The ordering in CuAu-ln alloys proceeded in CuAu II phase via aformation of CuAu lphase in the early stage and coexistent state of (CuAu I + CuAu II). CuAu II phase was stabilized by the In addition.
3. Age-hardening was produced in early aging time and maintained for relatively long time.
4. Increase of the axial ratio and decrease of the domain size in CuAu ordered phase were recognized.
5. Indium in CuAu-In alloy was occupied on both sites in CuAu II type superlattice structure.
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Report
(3 results)
Research Products
(20 results)
