The invention relates to the field of nuclear energy structural materials and preparation, and provides a high-
toughness low-activation FeCrVO multi-principal-element
alloy and a preparation method thereof. The atomic percentage expression of the
alloy is FeaCrbVcOd, a is larger than or equal to 20 and smaller than or equal to 35, b is larger than or equal to 20 and smaller than or equal to 35, cis larger than or equal to 20 and smaller than or equal to 35, d is larger than 0 and smaller than or equal to 3, and a + b + c + d = 100. The preparation process comprises the following steps of removing
surface oxide skin of
raw material Fe, Cr and V, accurately weighing according to a
molar ratio, and adding an element O in a form of low-melting-point V2O5; and
smelting a target
alloy in a non-consumable
vacuum arc furnace or a vacuum magnetic suspension
smelting furnace, and obtaining the alloy through a vacuum suction
casting or
casting method. According to the preparation method, the strength and compression
plasticity of the low-activation FeCrV multi-principal-element alloy are remarkably improved innovatively through adding the element O, and the comprehensive tensile property ofthe low-activation FeCrV multi-principal-element alloy is remarkably superior to that of an existing low-activation multi-principal-element alloy; and the alloy has high strength, high
toughness, highthermal stability and excellent
radiation resistance, and has an application prospect in the field of structural materials for nuclear energy.