Tensile properties of non-equiatomic Ni38Co25Cr15Fe10Al10Ti1Nb1 high entropy alloy
In order to further improve the strength of high entropy alloy(HEA)with FCC structure,a Ni38Co25Cr15Fe10Al10Ti1Nb1 HEA was prepared by vacuum arc melting method.The results show that the solidified structure of HEA is composed of single-phase FCC,and the typical dendrite with composition segregation can be observed within the as-cast strip.Besides,the HEA shows high recrystallization resistance,and the recrystallization fraction is only about 45.1％at the annealing temperature of 1 000℃.In contrast,a completely recrystallized structure can be achieved when the annealing temperature increases to 1 050℃.Homogenous microstructure with refined grain size is obtained with the fully recrystallized HEA,and the corresponding average grain size is about 4.25 μm.Excellent tensile properties can be obtained with the annealed Ni38Co25Cr15Fe10Al10Ti1Nb1 HEA.When annealing at 1 000℃,the ultimate tensile strength is about 1640 MPa with an elongation of about 20％.For the HEA annealed at 1050℃,the ultimate tensile strength and the elongation are about 1 580 MPa and 28％,respectively.
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