The invention relates to a method for preparing a nano spherical
oxide dispersion strengthening phase, and provides a method for preparing the nano spherical
oxide dispersion strengthening phase by adopting micron
oxide for the first time. Firstly, nano oxide / matrix
alloy composite
powder with a completely amorphous structure is prepared by taking the micron oxide as a
raw material and adopting astaged mechanical ball milling method. According to the preparation method, ball milling is carried out at the first stage, so that the oxide is subjected to crushing and
structural transformation, nanocrystallization and complete amorphization are realized, and composite
powder in which the nano oxide with a complete amorphous structure is uniformly distributed in matrix
alloy powder is prepared;and in the second stage, the composite powder obtained in the first stage and the remaining matrix
alloy powder are subjected to ball milling and evenly mixed. Then, the prepared powder is sequentially subjected to hot forming, hot rolling and heat treatment, and the nano spherical
oxide dispersion strengthened alloy is obtained. According to the method, the dispersion strengthening effect of anoxide phase can be obviously improved, and the room-temperature and high-temperature mechanical properties of the alloy are obviously improved. The method is simple, the production efficiency is high,the prepared alloy is excellent in performance, and the strength and
plasticity of the alloy are obviously superior to those of the same type of alloy.