title: Comparison of mechanical properties for equiaxed fine-grained and dendritic high-palladium alloys.
abstract: Two Pd-Cu-Ga alloys and a Pd-Ga alloy were selected for study. Bars of each alloy were tested in tension for the as-cast and simulated porcelain-firing conditions, and values of mechanical properties were measured. Fracture surfaces and microstructures of axially sectioned fracture specimens were observed with the SEM. The two Pd-Cu-Ga alloys exhibited similar mechanical properties. The Pd-Ga alloy had lower strength and higher percentage elongation. Heat treatment simulating porcelain firing cycles decreased the strength of both Pd-Cu-Ga alloys and increased their ductility. However, this heat treatment did not significantly affect the mechanical properties of the Pd-Ga alloy. All three high-palladium alloys had the same modulus of elasticity. The amount of overall porosity was relatively minimal (< 1%) and not significantly different among the three alloys. However, porosity was a significant factor for UTS of one Pd-Cu-Ga alloy and the Pd-Ga alloy.
authors.affiliation: College of Dentistry, The Ohio State University, Columbus, OH, USA. Papazoglou.1@osu.edu
authors.forename: E
authors.initials: E
authors.lastname: Papazoglou
authors.forename: Q
authors.initials: Q
authors.lastname: Wu
authors.forename: W A
authors.initials: WA
authors.lastname: Brantley
authors.forename: J C
authors.initials: JC
authors.lastname: Mitchell
authors.forename: G
authors.initials: G
authors.lastname: Meyrick