Al0.25Cu0.75FeNiCo颗粒增强铝合金的组织与性能

Microstructure and mechanical properties of Al0.25Cu0.75FeNiCo HEAs particulates reinforced aluminum alloy

摘要:

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。本文采用Al_0.25Cu_0.75FeNiCo高熵合金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降低的趋势。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20.54%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。

关键词:高熵合金;铝基复合材料;组织;力学性能;强韧化

Abstract:

High entropy alloy is a novelty structural and functional materials. For the excellent interfacial wettability between HEAs and Al alloy, the interfaces of HEAs-Al is well-bonded. In this paper, the Al_0.25Cu_0.75FeNiCo particles were used as the reinforcement to improve the strength and ductility of aluminum alloy. The effects of HEAs content on microstructure and mechanical properties of the composites were investigated. Microstructure observation showed that the HEAs particles were distributed uniformly in the composites. With the reinforcement content increasing, particles clustering were found in local region. Results showed that the modulus and hardness of the composites increase with increasing of reinforcement content. While the tensile strength and elongation of the composites increase firstly then drop with increasing of reinforcement content. At a reinforcement content of 5%, the maximum tensile strength and elongation of the composites is 437.6 MPa and 11.42%, which were 20.54% and 36.6% higher than those of the aluminum alloy matrix. The excellent comprehensive mechanical properties is due to the well-bonded interfaces of HEAs-Al.

Key words:high entropy alloy; aluminum matrix composites; microstructure; mechanical properties; toughening