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Journal of Materials Science

, Volume 26, Issue 4, pp 1113–1118 | Cite as

Retardation of grain boundary reactions in Ag-Pd-Cu alloys by additions of small amounts of other elements

  • Isao Kawashima
  • Yoshima Araki
  • Hiroki Ohno
Papers

Abstract

The grain-boundary reactions in Ag-25 mass% Pd-10 mass% Cu alloys with 1 mass% aluminium, cobalt, tin, chromium or indium, were investigated by optical microscopy, electrical resistivity, and hardness tests. Addition of tin and chromium retarded grain-boundary reactions. The growth rate of nodules with tin addition was 1/18 of the alloy without additons. Grain-interior reactions are accelerated with chromium, tin and indium addition, with chromium the most effective. The activation energies for the grain-interior and grain-boundary reactions are 192 to 196 and 144 to 208 kJ mol−1, respectively. Additions retard the growth but not the nucleation at the grain boundary. It is concluded that elements which form stable precipitates in the grains retard the grain-boundary reaction.

Keywords

Polymer Aluminium Nodule Growth Rate Microscopy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • Isao Kawashima
    • 1
  • Yoshima Araki
    • 1
  • Hiroki Ohno
    • 1
  1. 1.Department of Dental Materials Science, School of DentistryHigashi-Nippon-Gakuen UniversityHokkaidoJapan

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