Effect of Cryogenic Treatment on Microstructure and Properties of Al1.2CrFe2Ni2 High Entropy Alloy
Al1.2CrFe2Ni2 high entropy alloy ingot was prepared by non-consumable vacuum arc melting furnace,and cryogenic treatment was carried out for different time by liquid nitrogen.The effect of cryogenic treatment time on the microstructure and properties of the alloy was analyzed.The results showed that with the extension of cryogenic treatment time,the grain size of Al1.2CrFe2Ni2 high entropy alloy decreased first and then increased,and B2 nanophase precipitated at the grain boundary of the alloy,and its volume fraction increased first and then decreased.Cryogenic treatment had the effect of fine grain strengthening and precipitation strengthening on Al1.2CrFe2Ni2 high entropy alloy.When the cryogenic time was 24 h,the hardness,compressive yield strength and friction and wear properties of the alloy reached the maximum.The hardness and yield strength were HV 607.5 and 1 259.9 MPa,respectively,which were 18.7%and 5.2%higher than those of the as-cast alloy.The average friction coefficient decreased from 0.89 to 0.66.
high entropy alloycryogenic treatmentcompression performanceVickers hardnessfriction and wear properties
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