Effect of annealing temperature on microstructure and properties of the as-cast CoCrFeNiMn high entropy alloy was studied by annealing at different temperatures(600,850 and 1000 ℃).The results show that both the as-cast and annealed CoCrFeNiMn high entropy alloys have a single-phase FCC structure,the microstructure is a typical dendritic structure,and there are grain like particles precipitated between dendrites.Compared with the as-cast state,after annealing at 600℃,the precipitates in the alloy are discontinuous and redissolved,the tensile strength increases to 468.21 MPa,the elongation after fracture increases to 42.38％,and the hardness decreases to 143 HV0.2.After annealing at 850 ℃,the precipitates in the alloy increase and are uniformly dispersed,the tensile strength decreases to 446.61 MPa,the the elongation after fracture increases to 50.56％,and the hardness increases to 161 HV0.2.After annealing at 1000 ℃,the precipitates in the alloy dissolve again,the tensile strength decreases to 436.54 MPa,the elongation after fracture decreases to 44.54％,and the hardness decreases slightly.By comprehensive comparison,the comprehensive mechanical properties of the alloy annealed at 850 ℃are the best.
CoCrFeNiMn high entropy alloyannealingprecipitatesmechanical properties
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