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Age-hardening and the associated phase transformation in an Au-55.2 at% Cu-17.4 at% Ag ternary alloy

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Abstract

To develop a low gold content dental alloy, age-hardening characteristics in an Au-55.2 at% Cu-17.4 at% Ag alloy were studied by means of hardness, electron microscopy and X-ray diffraction examination. Three distinct age-hardening behaviours depending on temperature were found in the alloy, i.e. (i) a dual mechanism of spinodal decomposition and Cu3Au ordering below 673 K, (ii) a single mechanism of spinodal decomposition at 693 K, and (iii) a single mechanism of nucleation and growth of silver-rich precipitate at 773 K. A marked over-ageing was observed by lengthy ageing over the whole range of temperature. The long-period superstructure of Cu3Au(II) was found only in the grain boundary product at temperatures between 623 and 633 K.

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Authors and Affiliations

  1. Department of Dental Materials Science, Nagasaki University School of Dentistry, 852, Nagasaki, Japan

    Masaharu Nakagawa & Katsuhiro Yasuda

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  1. Masaharu Nakagawa
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  2. Katsuhiro Yasuda
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Nakagawa, M., Yasuda, K. Age-hardening and the associated phase transformation in an Au-55.2 at% Cu-17.4 at% Ag ternary alloy. J Mater Sci 23, 2975–2982 (1988). https://doi.org/10.1007/BF00547478

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  • DOI: https://doi.org/10.1007/BF00547478

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