Effects of Casting Conditions and Annealing on Microstructures and Vickers Hardness of Dendritic Pd-Cu-Ga Dental Alloys

Authors

William A. Brantley, The Ohio State University
Qiang Wu, The Ohio State University
Zhuo Cai, The Ohio State University
Stanley G. Vermilyea, The Ohio State University
John C. Mitchell, The Ohio State University
Michael C. Comerford, The Ohio State University

Abstract

Three Pd-Cu-Ga alloys with as-cast dendritic microstructures and very similar compositions, two containing less than 1 wt% boron and the third boron-free, were cast with normal bench-cooling or rapid-quenching into water. Quenched specimens were also heat treated at temperatures of 1000°, 1200°, 1500° and 1800°F that span the firing cycles for dental porcelain. Similar values of Vickers hardness were observed for all three alloys, suggesting little effect from boron on yield strength. The hardness was relatively insensitive to the experimental conditions, except for heat treatment at 1500° and 1800°F where significant softening occurred with transformation of the microstructure to Pd₂Ga and the palladium solid solution.

Recommended Citation

Brantley, William A.; Wu, Qiang; Cai, Zhuo; Vermilyea, Stanley G.; Mitchell, John C.; and Comerford, Michael C. (1999) "Effects of Casting Conditions and Annealing on Microstructures and Vickers Hardness of Dendritic Pd-Cu-Ga Dental Alloys," Cells and Materials: Vol. 9: No. 2, Article 2.
Available at: https://digitalcommons.usu.edu/cellsandmaterials/vol9/iss2/2