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Journal of Dental Research
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*Compound via MeSH
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*PALLADIUM
*PLATINUM
*PLATINUM COMPOUNDS
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Age-hardening Mechanisms in a Commercial Dental Gold Alloy Containing Platinum and Palladium

T. Tani

Department of Dental Materials Science, Nagasaki University School of Dentistry, 7-1 Sakamoto-machi, Nagasaki 852, Japan, Center for High Voltage Electron Microscopy, University of Antwerp (RUCA), Groenenborgerlaan 171, B2020 Antwerp, Belgium

K. Udoh

Department of Dental Materials Science, Nagasaki University School of Dentistry, 7-1 Sakamoto-machi, Nagasaki 852, Japan, Center for High Voltage Electron Microscopy, University of Antwerp (RUCA), Groenenborgerlaan 171, B2020 Antwerp, Belgium

K. Yasuda

Department of Dental Materials Science, Nagasaki University School of Dentistry, 7-1 Sakamoto-machi, Nagasaki 852, Japan, Center for High Voltage Electron Microscopy, University of Antwerp (RUCA), Groenenborgerlaan 171, B2020 Antwerp, Belgium

G. Van Tendello

Department of Dental Materials Science, Nagasaki University School of Dentistry, 7-1 Sakamoto-machi, Nagasaki 852, Japan, Center for High Voltage Electron Microscopy, University of Antwerp (RUCA), Groenenborgerlaan 171, B2020 Antwerp, Belgium

J. Van Landuyt

Department of Dental Materials Science, Nagasaki University School of Dentistry, 7-1 Sakamoto-machi, Nagasaki 852, Japan, Center for High Voltage Electron Microscopy, University of Antwerp (RUCA), Groenenborgerlaan 171, B2020 Antwerp, Belgium

The age-hardening mechanism of a commercial dental gold alloy containing platinum and palladium (in wt.%, 15 Cu, 6 Ag, 5 Pt, 3 Pd, 3 Zn, with the balance as gold) was elucidated by means of electrical resistivity, hardness tests, x-ray and electron diffraction and electron microscopy, as well as high-resolution electron microscopy. The sequence of phase transformations during isothermal aging below the critical temperature, Tc = 825 K, was described as follows: disordered solid solution {alpha} 0 (FCC) -> metastable AuCu I' ordered phase (FCT) -> metastable {alpha} 2 disordered phase (FCC) equilibrium AuCu I ordered phase (FCT) + equilibrium {alpha} 2 disordered phase (FCC). The hardening was due to the introduction of coherency strain at the interface between the AuCu I' platelet and the matrix. These ordered platelets had mutually perpendicular c-axes to compensate for the strain introduced by their tetragonality. A loss of coherency at the interface brought about softening of the alloy, i.e., over-aging.

Journal of Dental Research, Vol. 70, No. 10, 1350-1357 (1991)
DOI: 10.1177/00220345910700100701
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