Abstract
Two novel aluminum alloys were designed and studied by incorporating concepts of high entropy and conventional aluminum alloys. The alloys: Al–4Zn–4Mg and Al–4.5Zn–4.5Mg (mol.%) have a single-phase FCC matrix with a maximized concentration of the alloying elements. CALculation of PHAse Diagrams (CALPHAD) approach was applied to determine the compositions and the design of heat treatment schedules. Both alloys show high stiffness and high strength after solution treatment and have excellent impact-resistance after artificial aging. The phase stabilities and strengthening mechanisms were investigated using Optical Microscopy (OM), Scanning Transmission Electron Microscopy (STEM), and X-Ray Diffraction (XRD). The results show that the GP zones and T-phase nanoparticles are mainly responsible for the high stiffness-high strength and impact resistance properties.
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