高熵合金增强铸造铝合金的组织与性能

Microstructure and Properties of High Entropy Alloy Reinforced Cast Aluminum Alloy

采用机械合金化工艺制备了Al_(0.25)Cu_(0.75)FeCoNi高熵合金(HEA)颗粒,并采用挤压铸造工艺制备了高熵合金颗粒增强铝基复合材料(HEA/Al),研究高熵合金颗粒体积分数对复合材料显微组织及力学性能的影响。结果表明,当高熵合金颗粒体积分数为5%时,高熵合金颗粒在基体中分布均匀;随着高熵合金颗粒体积分数增加,复合材料局部出现了团聚的现象,且其硬度逐渐增大,但其抗拉强度和伸长率随着体积分数的增大而减小,其中,当高熵合金颗粒体积分数为5%时,综合性能最佳,抗拉强度相比于基体合金提高了12.5%。

Al0.25Cu0.75FeCoNi high-entropy alloy(HEA)particles were prepared by mechanical alloying.High-entropy alloy particles reinforced cast aluminum alloy composites were prepared by squeeze casting.The effects of HEAs content on the microstructure and mechanical properties of the composites were investigated.The results show that with the volume fraction of high-entropy alloy particles of 5%,high-entropy alloy particles present uniform distribution in the matrix.As the volume fraction increase,partial agglomeration can be observed,and the hardness of composites is increased with decrease of the tensile strength and elongation.The desirable performance can be observed with 5%particles addition,where tensile strength is increased by 12.5%compared with that of matrix alloy.