【摘要】 AlCoCrFeNi_2.1共晶高熵合金具有优异的力学性能和极好的铸造性能，能够制造大尺寸、形状复杂的铸件，但是，较低的屈服强度限制其工程化应用。热处理、形变加工和激光加工是提升该合金强度的重要工艺，基于细晶强化、析出强化、位错强化、背应力强化和异质变形诱导强化等强化机制，综述了单个工艺或多个工艺相结合的强化效果，分析了热处理温度和时间、变形温度和应变量、激光扫描速度、能量密度和光斑直径等工艺参数对AlCoCrFeNi_2.1共晶高熵合金晶粒尺寸、片层间距、片层结构和纳米强化相等组织演化行为的影响。指出获得纳米相/超细晶-双相异质片层组织，可制备高强高塑AlCoCrFeNi_2.1共晶高熵合金。最后，指出未来的研究应侧重于AlCoCrFeNi_2.1共晶高熵合金的微观组织演化的精准表征方法，相转变机制和元素扩散理论模型等方面，并阐明工艺参数-显微组织-力学性能之间的内在关联机制。更多还原

【Abstract】 AlCoCrFeNi_2.1 eutectic high-entropy alloy has excellent mechanical properties and casting performance, and can manufacture large-sized and complex shaped castings. However, its low yield strength limits its engineering applications. Heat treatment, deformation processing, and laser processing are important processes for improving the strength of this alloy. Based on strengthening mechanisms such as fine grain strengthening, precipitation strengthening, dislocation strengthening, back stress strengthening, and heterogeneous deformation induced strengthening, the strengthening effects of a single process or a combination of multiple processes are reviewed. The effects of process parameters such as heat treatment temperature and time, deformation temperature and strain, laser scanning speed, energy density, and spot diameter on the microstructure evolution behavior such as grain size, lamellar spacing, lamellar structure, and nano reinforced phase, of the AlCoCrFeNi2.1 eutectic high entropy alloy were analyzed. It is pointed out that obtaining a nano phase/ultrafine grain dual phase heterogeneous layer structure can prepare high-strength and high plasticity AlCoCrFeNi_2.1 eutectic high entropy alloy. Finally, it is pointed out that future research should focus on the precise characterization methods of microstructure evolution, the phase transition mechanism, and the element diffusion theoretical models of the AlCoCrFeNi_2.1 eutectic high-entropy alloy, and elucidate the intrinsic correlation mechanism between process parameters, microstructure, and mechanical properties.更多还原