With the successive development of a variety of high-performance multi-principal alloys with different compositions and the rapid expansion of their applications in the field of tribology,it is crucial to study and reveal the tribological behavior of multi-principal alloys.A molecular dynamics simulation method was used to construct a friction and wear model of multi-principal alloys at the nanoscale,and the surface morphology,wear atoms,friction force,and dislocation and stresses evolution of three alloys,FeCoCrNiCu,FeCoCrNi,and FeNiCr,were investigated.The results show that the FeCoCrNi alloy has the least surface deformation,the minimum number of wear particles,and the highest normal force at the same scratch depth,which is due to the increased hardness of the alloy after adding Co element.The FeCoCrNiCu exhibits a more severe plastic deformation as well as more complex dislocation deformation due to the decreased hardness of the alloy after adding Cu element.The prismatic dislocation loops are observed in FeCoCrNiCu and FeCoCrNi,but not in FeNiCr.This is because the stacking fault energy of FeNiCr is relatively low,making it difficult to form prismatic dislocation loops.The research results provide a reference for the development and application of multi-principal element alloys.