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Comparison of mechanical properties for equiaxed fine-grained and dendritic high-palladium alloys

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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.

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Authors and Affiliations

  1. College of Dentistry, The Ohio State University, Columbus, OH, USA

    E. Papazoglou

  2. Therm-O-Disc, Inc., Mansfield, OH, USA

    Q. Wu

  3. College of Dentistry, The Ohio State University, Columbus, OH, USA

    W. A. Brantley

  4. Department of Geological Sciences and Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA

    J. C. Mitchell

  5. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA

    G. Meyrick

Authors
  1. E. Papazoglou
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  2. Q. Wu
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  3. W. A. Brantley
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  4. J. C. Mitchell
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  5. G. Meyrick
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Papazoglou, E., Wu, Q., Brantley, W.A. et al. Comparison of mechanical properties for equiaxed fine-grained and dendritic high-palladium alloys. Journal of Materials Science: Materials in Medicine 11, 601–608 (2000). https://doi.org/10.1023/A:1008940510856

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