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Eutectic multi-principal element alloys show great promise due to their exceptional castability, unique near-equilibrium microstructure, and controllability. In this study, a novel copper-containing Cu 42.3 Ni 30 Si 15 Al 12.7  eutectic multi-principal element alloy was designed and investigated. The microstructure of the alloy is composed of primary phase Ni 2 Si and eutectic phase (FCC(Cu) + BCC(NiAl)). The eutectic reaction temperature is 1004°C. Understanding the solidification process is crucial for optimising solidification parameters and subsequent annealing. The as-cast Cu 42.3 Ni 30 Si 15 Al 12.7  alloy exhibits high micro-hardness (400 ± 2.4 HV) and compressive fracture strength (1511 MPa)

Microstructure and solidification behaviour of CuNiSiAl eutectic multi-principal element alloy