title: Precipitations in a dental Ag-Pd-Cu-Au alloy.
abstract: The structure of a dental Ag-PD-Cu-Au alloy has been studied after centrifugal casting and various heat treatments. By transmission electron microscopy, a high density of small fct particles, assumed to be PdCu, was observed, but, in addition, finely-spaced rods of approximately equal to 0.05 micrometer (500 A) diameter with an fcc structure precipitated on the [100] planes of the matrix were found. On the basis of their structure and the pertaining lattice parameter, these rods are assumed to be Cu-rich. They could also be observed by scanning electron microscopy, but not at annealing temperatures lower than 425 degrees C.
mesh_terms: D055598:Chemical Phenomena; D011232:Chemical Precipitation; D002627:Chemistry, Physical; D003300:Copper; D003722:Dental Alloys; D006046:Gold; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D010165:Palladium; D012834:Silver; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D003722:Dental Alloys; D012834:Silver; D010165:Palladium; D006046:Gold; D003300:Copper