Microstructure and properties of FeCoNi1.5CrCup/Al high-entropy alloy strengthened aluminum matrix composites and finite element simulation

Abstract

In this study, high-entropy alloy (HEA) particles were used as the reinforced phase to prepare a high strength-toughness FeCoNi1.5CrCup/Al aluminum matrix composite. On the condition of different HEA adding amount, the microstructure and macro/micro mechanical properties together with their relationship are characterized. The finite element simulation is conducted to calculate the macro/micro mechanical properties and acquire a well-fitting with the experimental data. The research shows that when the HEA adding amount is 15 wt%, the particulate size is moderate and evenly distributed in the matrix, the HEA/Al interface is tightly bonded and no impurity phase is formed. The corresponding yield, compressive strengths and maximum compression ratio are 202.6 MPa, 391.2 MPa and 59.7% separately, which reaches an optimized high level. The particulate, dislocation and interface strengthening mechanisms are regarded as the main positive factors. The created "HEA/Al composite micro/macro performance simulation" finite element model provides a new scheme and technical route for the design, preparation and mechanical properties research of new composite materials.