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 Al 3Sc 1−0.5Zr 0−0.5 phase with L1 2 structure and Al 3Zr 1−0.8Sc 0−0.2 with DO 23 structure are in equilibrium with the α-solid solution, Zr being dissolved in Al 3Sc, further substituting for about 50 at.% Sc whilst Sc is present in the phase Al 3Zr and the maximum substitution for Zr is about 20 at.% Zr.
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