Abstract
The age-hardening characteristics of a commercial dental gold alloy Au-11wt.%Pt-6wt.%Pd-6wt.%Ag-9wt.%Cu were studied by means of resistometric measurements, hardness tests, X-ray diffraction and electron microscopy. The resistometric and hardness studies showed that age hardening occurred in two stages. The first stage arose from the nucleation of the AuCu I type ordered structure and was characterized by a slow growth rate of the ordered platelets. In the second stage, simultaneous ordering and precipitation took place. An alternating lamellar structure composed of the AuCu I type ordered platelets and platinum-rich f.c.c. precipitates was observed in electron micrographs. The age hardening in this stage was considered to arise primarily from ordering and to be brought about with the aid of precipitation. The grain boundary precipitates did not contribute to the age hardening in the alloy we studied.
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