| The microstructures of Au-based alloy were investigated for the as-casted state, solution heat treated at 750℃ for 1 h, 850℃ for 4 h, and 950℃ for 1 h, and uniform heat treated at 950℃for 4 h by metallurgical structure examination, differential thermal analysis (DSC), X-ray diffraction (XRD), scanning electron micrograph (SEM) and energy spectrum analysis (EDS). This Au-based alloy is composed of Au(Cu, Pd), Pt(Rh, Ni), and the mixture of both. With the heat treated temperature elevated, Pd solute segregated from the mixtures. AuCu3 phase with L12 structure formed as heat treated at 700℃, 850℃, and 950℃. |
