Abstract
Abstract The 430 °C isothermal section of the Al–4Mg–Sc–Zr quaternary system in the Al-rich range has been determined by means of equilibrium alloys with the use of microstructural, X-ray diffraction analysis, and electron probe microanalysis. There coexist three single-phase fields, two two-phase fields and one three-phase field. It is established that the Al3Sc1−0.5Zr0−0.5 phase with L12 structure and Al3Zr1−0.8Sc0−0.2 with DO23 structure are in equilibrium with the α-solid solution, Zr being dissolved in Al3Sc, further substituting for about 50 at.% Sc whilst Sc is present in the phase Al3Zr and the maximum substitution for Zr is about 20 at.% Zr.
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