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In the present study, two newly developed non-equiatomic high entropy Al10Cr12Mn28Fe(50-x)Ni(x) alloys (x= 20 & 15 at%, namely: Ni20 & Ni15, respectively) are investigated. The studied HEAs were designed based on thermodynamic principles to maintain high ductility and improve strength. Ingots were prepared using arc-melting then microstructure examinations and mechanical properties for the as-cast alloys were done. The mechanical properties were enhanced for the as-cast material, compared with previously introduced HEAs of the same system, namely Al5Cr12Mn28Fe35Ni20, (Al5) and Al10Cr12Mn23Fe35Ni20, (Al10). Al10Cr12Mn28Fe30Ni20 (Ni20) HEA generally shows the highest compressive yield strength which was improved by ∼7% when compared with previously introduced Al10.

In the present study, non-equiatomic AlCrFeMn x−TiNi high-entropy alloys bearing cost-effective elements were developed in light of enhancing mechanical strength. The Al5Cr12Fe35Mn28Ni20 HEA was used as a reference. However, the HEA containing Ti (Ti-HEA) was designed with a composition of Al5Cr12Fe35Mn23Ni20Ti5. The microstructural characteristics were studied by X-ray diffraction, electron probe micro-analysis, and electron backscattering diffraction. Subsequently, the mechanical properties were determined using micro-hardness, tensile and compression tests. Whereas the Ti-free HEA displayed a single FCC structure, a multi-phase structure was observed in the Ti-HEA. The mechanical tests showed that the Ti element significantly enhanced the strength. The strengthening effect was more intense during compression loading as the Ti-HEA exhibited superior combination of compressive strength and ductility (2.35GPa at 50% strain without fracture).

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