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.
|Number of pages||6|
|Journal||Journal of Materials Science: Materials in Medicine|
|Publication status||Published - 1 Jun 1990|