Novel HEAp-Ti/Al laminated composites embedded with particles of the high-entropy alloy Al0.5CoCrFeNi (HEA) were fabricated by vacuum hot-press sintering at 730 °C. The phase composition and microstructure of the composites were studied with X-ray diffractometer (XRD), scanning electron microscope SEM, energy dispersive spectrometer (EDS), transmission electron microscope (TEM), and electron backscattering diffraction (EBSD) techniques. At this temperature, it has been observed that Al3Ti intermetallic compound is the favored phase and the reaction results in the dispersion of Al3Ti in the original Al layer. A large number of interfaces are formed between Al3Ti and Al. The deformed Al3Ti grains are concentrated in the interface near the Ti side. The mechanical properties, including tensile and compressive properties at room temperature, were analyzed. The tensile test results indicate that the composite exhibited an average tensile strength of 258 MPa and an average yield strain of 9.86%. Compression test results show that when a load perpendicular to the layer is applied, the yield strain and yield stress of the material are 9.67% and 474.09 MPa, respectively. Moreover, under a load parallel to the layer, the material fails due to interfacial debonding.

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Four groups of 5182, 5182-0.4 % Sc, 5182-0.1 % Sc-0.3 % Zr and 5182-0.3 % Sc-0.1 % Zr (wt.%) aluminium alloys were prepared. The microstructures of these alloys were examined using optical microscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results showed that the addition of Sc leads to the effect of grain refinement, and adding both Sc and Zr makes this phenomenon even more obvious. The morphology and distribution of the second phase changed. The addition of Sc makes the tensile strength increase and the elongation decrease. Adding both Sc and Zr significantly improves the mechanical properties of the alloy. The tensile strength of 5182-0.3 % Sc-0.1 % Zr alloy reaches a maximum value of 223 MPa, and the Brinell hardness of the alloy reaches a maximum value of 88.7 HBW.