1997 Fiscal Year Final Research Report Summary
Coherent Phase Diagram of Au-Cu-Pt Ternary System by High Resolution Electron Microscopy
| Project/Area Number |
07457475
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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 |
補綴理工系歯学
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| Research Institution | Nagasaki University |
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Principal Investigator |
UDOH Koh-ichi Nagasaki University Instructor School of Dentistry, 歯学部, 助手 (60145266)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Yasuhiro Nagasaki University Instructor School of Dentistry, 歯学部, 助手 (10217086)
HISATSUNE Kunihiro Nagasaki University Professor School of Dentistry, 歯学部, 教授 (20037526)
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| Project Period (FY) |
1995 – 1997
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| Keywords | Gold alloy / Platinum / Dental Precious alloy / Age-hardening / Order-disorder transformation / Transmission electron microscopy / Selected area diffraction / X-ray diffraction |
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| Research Abstract |
Acoherent phase diagram of the AuCu-Pt pseudobinary system was determined mainly by means of TEM bright- and dark-field imaging and selected area electron diffraction techniques according to the hypothesis of Allen and Cahn, because a coherent phase diagram gives us more effective information to predict phase transformations related to age-hardening characteristics in an alloy system than an equilibrium phase diagram.
The following phase regions were found in the present experiments ; (1) alpha_0 single-phase of fcc disordered solid solution region ; (2) AuCu I(L1_0)fct ordered single-phase region ; (3) long-period orthorhombic superstructure AuCu II(L1_<0-S>)single-phase region ; (4) alpha + AuCu I region of two coexisting phases ; (5) AuCu I + AuCu II region of two coexisting phases ; (6) alpha + AuCu I + AuCu II region of three coexisting phases.
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