Abstract
The phase diagram of the Al–Cu–Zn ternary system was re-investigated experimentally. The current study was designed to contribute to a better description of those parts of the phase diagram, which are disputed in the current scientific literature. Mutual relations in the family of ternary intermetallic phases τ with cubic, rhombohedral and modulated structure at temperatures 400 °C and 550 °C were described. The phase relation between the γ and γ′ phases was studied at different temperatures. A two-phase field between γ and γ′ was observed below 400 °C, while the transition appears to be second order at higher temperatures. A vertical section between γ and γ′ phases in Cu–Zn and Al–Cu and four isothermal sections at 400 °C, 550 °C, 700 °C and 820 °C, respectively, were constructed.
Highlights
Introduction and literature reviewIntroductionThe Al–Cu–Zn ternary system has been investigated intensively in the past because of its technical importance for developing of light-weight alloys
The current study was designed to contribute to a better description of those parts of the phase diagram, which are disputed in the current scientific literature
We studied the crystal structure and homogeneity ranges of the reported ternary phases s and s0 and constructed the isothermal sections of the phase diagram Al–Cu– Zn based on our new experimental results at 400 °C, 550 °C, 700 °C and 820 °C as well as the vertical section describing the mutual relation between c and c0 phases
Summary
Introduction and literature reviewIntroductionThe Al–Cu–Zn ternary system has been investigated intensively in the past because of its technical importance for developing of light-weight alloys. 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 [1, 2]. Major topics were the extensions of the c and c0 solid solution phases (with primitive and base-centered brass structures, respectively) and their mutual relation in the whole concentration and temperature range. We studied the crystal structure and homogeneity ranges of the reported ternary phases s and s0 and constructed the isothermal sections of the phase diagram Al–Cu– Zn based on our new experimental results at 400 °C, 550 °C, 700 °C and 820 °C as well as the vertical section describing the mutual relation between c and c0 phases
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