Abstract
(AlLiMg0.5Ti1.5)100-XScX (x = 0, 5, 10, 15, 20) lightweight high-entropy alloys (LW-HEAs) were fabricated by mechanical alloying and cold-press sintering (CPS). The effects of Sc content and sintering temperature on the microstructure, phase stability, and mechanical properties of the alloys were investigated, via multiple characterization methods including XRD, SEM, EDS and microhardness tests. The results reveal that the as-milled (AlLiMg0.5Ti1.5)100-XScX (x = 0, 5, 10, 15, 20) LW-HEAs form a single HCP solid solution phase or a simple microstructure dominated by an HCP solid solution phase. After CPS, significant phase transformation occurs. Higher Sc content improves alloy phase stability and inhibits phase transformation during the sintering, which is influenced by kinetic and thermodynamic factors. Among them, the alloy containing 20 at.% Sc (#Sc20) sintered at 550 °C is composed of HCP solid solution phase and a small amount of γ-Al12Mg17 phase, and this alloy has the simplest microstructure among all the alloys. The alloys generally display high Vickers-hardness. In addition, with increasing Sc content and sintering temperature, the hardness of the alloys increases obviously. Among them, the hardness of #Sc20 alloy sintered at 650 °C is as high as 589 HV, which is the highest among all the alloys.
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