formula Al 3Cu 5Zn 2) was theoretically modeled in this system by Liang and Chang. Only one ternary intermetallic compound τ (approx. Two isothermal sections at 500 ☌ and 700 ☌ and a liquidus projection were published in this paper. Liang and Chang published an overall thermodynamic description based on the CALPHAD approach. Most of the original references from the years 1905–2002 evaluated in Ghosh et al. The main difference exists for mutual relation between the two closely related γ (Al 4Cu 9) and γ′(Cu 5Zn 8) phases and ternary τ and τ′ phases which will be discussed later. These authors also published the most recent theoretical assessment based on this analysis in the same paper. The experimental ternary phase diagram Al–Cu–Zn provided in can be generally accepted except for the disagreement in the proposed phase equilibria between the γ and γ′ phases in comparison with the detailed analysis of existing experimental studies presented by Liang and Schmid-Fetzer. published a review of the experimental studies on the Al–Cu–Zn phase diagram available up to the year 2002. We also studied the crystal structure and homogeneity ranges of the reported ternary phases τ and τ′ and constructed the isothermal sections of the phase diagram Al–Cu–Zn based on our new experimental results at 400 ☌, 550 ☌, 700 ☌ and 820 ☌ as well as the vertical section describing the mutual relation between γ and γ′ phases.īinary phase diagram of subsystem. Major topics were the extensions of the γ and γ′ solid solution phases (with primitive and base-centered brass structures, respectively) and their mutual relation in the whole concentration and temperature range.
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Our work is focused on several doubtful regions of the phase diagram, which have not yet been satisfactorily resolved in the scientific literature, and on the divergent results from the experimental and theoretical publications. However, several areas of the phase diagram are still not well understood and discussed intensively. The Al–Cu–Zn ternary system has been investigated intensively in the past because of its technical importance for developing of light-weight alloys.