Age-hardening reactions and microstructures of a dental gold alloy with palladium and platinum

K. Hisatsune, M. Nakagawa, K. Udoh, B. I. Sosrosoedirdjo, M. Hasaka

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Abstract

The age-hardening reactions and microstructures of a dental casting gold alloy with some palladium and platinum were investigated by means of hardness tests, X-ray diffractometry, electrical resistivity measurements, and scanning and transmission electron microscopy. Ageing reactions during isothermal annealing were completed by two stages. The first stage corresponded to the formation of a metastable CuAu I phase within grains, and the second stage to a cellular reaction at grain boundaries. The former contributed to the hardening and the latter to the softening. An activation energy of 128 kJ mol-1 for hardening was obtained. Two types of cell growth were observed and could be distinguished in terms of the homologous temperature.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalJournal of Materials Science: Materials in Medicine
Volume1
Issue number1
DOIs
Publication statusPublished - Jun 1 1990
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering

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