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高熵合金是一种新型的结构与功能材料,源于金属-金属间天然的界面结合特性,高熵合金与铝合金基体间的界面润湿性极好。采用Al_(0.25)Cu_(0.75)FeNiCo高熵合金(HEA)颗粒作为增强相来增强铝合金,研究高熵合金含量变化对复合材料显微组织和力学性能的影响。结果表明:高熵合金增强相在基体中分布均匀,随着高熵合金体积分数的增大,局部会出现少量颗粒团聚现象。复合材料的弹性模量和硬度随着高熵合金含量的增加而增大,但复合材料的抗拉强度和延伸率呈现出先增大后减小的趋势。当高熵合金的体积分数为5%时,复合材料的极限抗拉强度和伸长率达到最大值(σb:437.6 MPa,ε:11.42%),比铝合金基体分别提高了20.1%和36.6%。TEM分析表明,高熵合金颗粒和铝合金良好的界面结合状态,使得复合材料具有较高的综合力学性能。
High-entropy alloy is a new type of structural and functional materials, due to the natural intermetallic properties of metal-metal interface, the interfacial wettability between high-entropy alloy and aluminum alloy is excellent. The Al_ (0.25) Cu_ (0.75) FeNiCo high entropy alloy (HEA) particles were used as reinforcing phase to reinforce the aluminum alloy. The effect of high entropy alloy content on the microstructure and mechanical properties of the composites was studied. The results show that the high-entropy alloy reinforcing phase is uniformly distributed in the matrix, and as the volume fraction of the high-entropy alloy increases, a small amount of particle agglomeration locally occurs. The elastic modulus and hardness of the composites increase with the increasing of the content of high-entropy alloy, but the tensile strength and elongation of the composites first increase and then decrease. When the volume fraction of high-entropy alloy is 5%, the ultimate tensile strength and elongation of the composites reach the maximum value (σb: 437.6 MPa, ε: 11.42%), which is 20.1% and 36.6% higher than that of the aluminum alloy matrix respectively. TEM analysis shows that the good interfacial bonding between the high-entropy alloy particles and the aluminum alloy leads to the high comprehensive mechanical properties of the composite material.