Phase equilibria in the Cu-rich portion of the Cu-Al binary system

X. J. Liu, I. Ohnuma, R. Kainuma, K. Ishida

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139 Citations (Scopus)


The phase equilibria in the Cu-Al binary system over the temperature range 500∼1000°C and the composition range 15∼60 at.% Al have been determined using diffusion couple technique, differential scanning calorimetry (DSC) and high temperature X-ray diffraction (XRD) methods. While the results from this study pertaining to the phase equilibria α/β and ∈1(∈2) liquid are in agreement with those reported in previous works, significant differences have been found between the earlier results and the present work in the composition range 25∼40 at.% Al. They are: (a) In the composition range 32∼38 at.% Al only a second order reaction, γ1 (D83)→γ0 (D82), is seen to occur and not a two-phase equilibrium γ01 reaction as reported before (b) The β0 phase is absent at high temperature near 1000°C and compositions near 30 at.% Al. (c) The equilibrium eutectoid γ0→β+γ1 and peritectoid γ0+∈1→γ1 reactions do not occur in this system.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1998 Jan 9


  • Crystal structure
  • Cu-Al phase diagram
  • Diffusion couple
  • Order-disorder transformation
  • Phase equilibria


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