Ordering behaviors and age-hardening in Cu0.5Au0.5-xNix alloys

T. Shiraishi, K. Fujii, M. Ohta, M. Nakagawa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The effect of partial substitutions of nickel for gold in an equiatomic CuAu alloy on the CuAu I ordering and age-hardening behaviors were investigated by electrical resistivity measurements, x-ray diffraction, transmission electron microscopy, and hardness testing. Age-hardening in Cu0.5Au0.5-xNix alloys with nickel content of up to about 12 at.% was considered to be attributed to the coherency strain between ordered nuclei and the surrounding matrix. Upon progressive ordering, the coherency strain was removed by the occurence of twinning, and this brought about a slight decline in hardness at the initial stage of overaging. The growth of antiphase domains in twin platelets gave rise to a further decrease in hardness at the later stage of overaging. The growth rate of anitphase domains in twin platelets apparently decreased with increases in the nickel content. Because of this fact, a softening rate of a Cu0.5Au0.5-xNix alloy in the overaging stage decreased as the nickel content increased.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalMaterials Characterization
Issue number2
Publication statusPublished - Mar 1993

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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