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Ageing behaviour in a dental low-gold alloy with high copper content
K Hamasaki1, K Hisatsune, K Udoh
1Department of Preventive Dentistry, Nagasaki University School of Dentistry, Nagasaki 852, Japan.
Abstract:
Phase transformation behaviour in a dental low-gold alloy with high copper content during continuous heating was investigated by hardness tests, electrical resistivity measurements, X-ray diffraction, scanning and transmission electron microscopies. Two kinds of solution treatment conditions (at 873 K and 1073 K) followed by iced-brine quench, represented different ageing behaviours. Although subsequent anisothermal annealing produced same phase separation of face-centred cubic disordered and ordered (Cu3Au) phases in both specimens, the specimen quenched from 1073 K had already been hardened by a spinodal decomposition.
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