Abstract: High-entropy alloy has attracted masses of attention due to its unique alloy design concept and excellent properties. The previous high-entropy alloys, whose density is relatively high, are mainly based on transition group elements, refractory elements or rare earth elements, which greatly limits their application. With the trend of material lightweight, the research on light-weight high-entropy alloys are gradually increasing. Light-weight high-entropy alloy is a new branch of high-entropy alloy based on light elements such as Al, Li, Mg, Ti, etc. Light-weight high-entropy alloys have unique advantages of low density, low modulus, high specific strength and high specific hardness. In addition, light-weight high-entropy alloys also have high strength, high hardness, excellent wear resistance, good oxidation resistance, excellent corrosion resistance, good high temperature oxidation resistance, high temperature softening resistance and good biocompatibility. The superior properties of light-weight high-entropy alloys have significant potential to be applied to aerospace and biotechnology. At present, the research of light-weight high-entropy alloys mainly involve the development of composition, preparation, characterization and properties. The development and design of new components mainly use the method of combination of empirical parameters, CALPHAD and DFT (Density functional theory) calculation. The main methods of alloys preparation are induction melting, arc melting and mechanical alloying. The phase composition and structure of light-weight high-entropy alloys usually include amorphous structure, single-phase polycrystalline structure, multiphase complex structure, etc. The research of performance mainly involves mechanical properties, include strength, hardness, high tempe-rature creep, etc., and also includes oxidation resistance, corrosion resistance, biocompatibility, etc. In this paper, the composition design, pre-paration, microstructure and properties of light-weight high-entropy alloy are reviewed. Meanwhile, the problems and challenges for light-weight high-entropy alloy are prospected.
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