Method for preparing nano spherical oxide dispersion strengthening phase

A method for preparing a nano spherical oxide dispersion strengthening phase, comprising:

• using an oxide powder as a first raw material and an alloy powder as a second raw material;
• mixing and ball milling the first raw material with a part of the second raw material to obtain a composite powder with completely amorphous structure nano oxide particles;
• mixing the composite powder with a remaining part of the second raw material by the mechanical ball milling, to obtain a uniformly mixed composite powder;
• subjecting the uniformly mixed composite powder to hot forming to prepare a nano-oxide dispersion strengthened alloy;
• and subjecting the nano-oxide dispersion strengthened alloy to a hot rolling and an annealing heat treatment, to obtain a nano spherical oxide-phase dispersion strengthened alloy, wherein
• a mass ratio of the first raw material to the part of the second raw material is 1:(1-10), and a mass ratio of the first raw material to the second raw material is (0.5-5):(99.5-95);
• the oxide powder of the first raw material is at least one selected from the group consisting of Y2O3 and TiO2;
• and
• the alloy powder of the second raw material is one selected from the group consisting of a Fe—Cr—W—Ti or Fe—Cr—W alloy, a nickel-based superalloy, a copper alloy, and a high-entropy alloy.

A method for preparing a nano spherical oxide dispersion strengthening phase, comprising the following steps:

• step 1:
• weighing a powder material according to a mass ratio of a first raw material to a second raw material of (0.5-5):(99.5-95);
• taking milling balls according to a mass ratio of a total mass of the powder material to a mass of the milling balls of 1:(10-20);
• and filling the first raw material, a part of the second raw material, and the milling balls into a milling can, and then sealing the milling can, wherein the milling balls with diameters of 18-22 mm, 14-16 mm, 9-11 mm, 7-8.5 mm, 4.5-5.5 mm, and 2.5-3.5 mm are compatible according to a mass ratio of (1-2):(1-2):(1-2):(1-2):(1-2):(1-2);
• and a mass ratio of the first raw material to the part of the second raw material is 1:(1-10);
• step 2:
• vacuumizing the milling can, and then filling the milling can with an inert gas;
• step 3:
• installing the milling can filled with the inert gas in step 2 into a planetary ball milling machine to perform the mechanical ball milling, wherein parameters of the mechanical ball milling comprise a milling time of 60-120 h, and a milling rotating speed of 200-300 r/min;
• step 4:
• after the mechanical ball milling in step 2 is completed, sieving a powder under an inert gas atmosphere in a glovebox to obtain a composite powder with uniformly distributed amorphous nano oxide;
• step 5:
• mixing the composite powder and a remaining part of the second raw material and filling into the milling can, filling the milling balls, and then installing the milling can into the planetary ball milling machine to perform the mechanical ball milling, to obtain the composite powder with the completely amorphous structure nano oxide particles, wherein during a preparation of the composite powder with completely amorphous structure nano oxide particles by the mechanical ball milling, a mass ratio of a total mass of the powder material to a mass of the milling balls is 1:(5-10), and the parameters of the mechanical ball milling comprise a milling time of 20-40 h, and a milling rotating speed of 200-300 r/min;
• and
• step 6:
• subjecting the composite powder with the completely amorphous structure nano oxide particles to hot forming, hot rolling, and heat treatment, to prepare the nano spherical oxide dispersion strengthening phase.