A Si-containing FeCoCrNi high-entropy alloy with high strength and ductility synthesized in situ via selective laser melting

•SLM process was optimized via polynomial regression model.•Remelting step between SLM scans led to homogenization of the metal powders.•Si addition increased the tensile strength while maintaining the ductility.•Interaction between dislocation loops with dislocations strengthened the alloy.•Effect of solid solution and dislocation loop on yield strength were quantified.