Abstract
The age-hardening reactions and microstructures of a dental casting gold alloy with some palladium and platinum were investigated by means of hardness tests, X-ray diffractometry, electrical resistivity measurements, and scanning and transmission electron microscopy. Ageing reactions during isothermal annealing were completed by two stages. The first stage corresponded to the formation of a metastable CuAu I phase within grains, and the second stage to a cellular reaction at grain boundaries. The former contributed to the hardening and the latter to the softening. An activation energy of 128 kJ mol-1 for hardening was obtained. Two types of cell growth were observed and could be distinguished in terms of the homologous temperature.
Original language | English |
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Pages (from-to) | 49-54 |
Number of pages | 6 |
Journal | Journal of Materials Science: Materials in Medicine |
Volume | 1 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jun 1990 |