Skip to main content
SpringerLink
Log in

Age-hardening associated with ordering and spinodal decomposition in a AgCu-40 at % Au pseudobinary alloy

  • Papers
  • Published:
Journal of Materials Science Aims and scope Submit manuscript

Abstract

The age-hardening mechanism in an AgCu-40 at% Au alloy was studied by means of electrical resistivity measurement, hardness tests, X-ray diffraction and electron microscopy. Two stages of hardening were found by isothermal ageing below 648 K, which was higher than the critical temperature of ordering, T c=620 K, in the present alloy. The first stage of hardening took place by formation of a modulated structure resulting from spinodal decomposition. Further hardening was brought about by ordering, yielding metastable AuCu I′ and/or AuCu II′ ordered platelets grown from the copper-rich portion of the modulated structure. Transitional ordering which gave rise to a marked hardening of the second stage was found, even though the temperature of below 648 K was higher than the T c of the present alloy. Drastic softening was also found on disappearance of the transitional ordered phases. Although the modulated structure was observed by ageing at 773 K, there was no age-hardening.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. K. Yasuda and M. Ohta, in Proceeding of 3rd Conference on Precious Metals, Chicago, May 1979, edited by M. E. Browning (International Precious Metals Institute, New York, 1979) p. 137.

    Google Scholar 

  2. K. Yasuda and M. Ohta, J. Dent. Res. 61 (1982) 473.

    Google Scholar 

  3. M. Nakagawa and K. Yasuda, J. Mater. Sci. 23 (1988) 2975.

    Google Scholar 

  4. C. Johansson and J. Linde, Ann. Physik 25 (1936) 1.

    Google Scholar 

  5. T. J. Tiedema, J. Boumasn and W. G. Burbers, Acta Metall. 5 (1957) 310.

    Google Scholar 

  6. L. J. van Dertoorn, ibid. 8 (1960) 715.

    Google Scholar 

  7. M. Ohta, T. Shiraishi, M. Yamane and K. Yasuda, Dent. Mater. J. 2 (1983) 10.

    Google Scholar 

  8. M. Nakagawa and K. Yasuda, J. Less-Common Metals 138 (1988) 95.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Dental Materials Science, Nagasaki University School of Dentistry, 7-1 Sakamoto-machi, 852, Nagasaki, Japan

    Koh -Ichi Udoh, Kunihiro Hisatsune & Katsuhiro Yasuda

  2. Department of Materials Science and Engineering, Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 852, Nagasaki, Japan

    Hiroyuki Fujiyama & Masayuki Hasaka

Authors
  1. Koh -Ichi Udoh
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Hiroyuki Fujiyama
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Kunihiro Hisatsune
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Masayuki Hasaka
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Katsuhiro Yasuda
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Udoh, K.I., Fujiyama, H., Hisatsune, K. et al. Age-hardening associated with ordering and spinodal decomposition in a AgCu-40 at % Au pseudobinary alloy. J Mater Sci 27, 504–510 (1992). https://doi.org/10.1007/BF00543944

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00543944

Keywords

Search

Navigation