Double-peak grain oxide dispersion strengthening molybdenum alloy and preparation method thereof

Abstract

The invention discloses a double-peak grain oxide dispersion strengthening molybdenum alloy and a preparation method thereof, and belongs to the technical field of refractory metal preparation. The molybdenum alloy comprises the following components in percentage by volume: 1 to 3 percent of Y-Zr-O dispersed composite oxide and 97 to 99 percent of molybdenum alloy matrix. The grain size of the molybdenum alloy matrix is in bimodal distribution, and the molybdenum alloy matrix comprises micron coarse grains and submicron fine grains; and the Y-Zr-O composite oxide is dispersed and distributed in submicron grains in the molybdenum alloy matrix or at the grain boundary. The preparation method comprises the following steps: performing supersaturated solid solution on Y2O3 and an active element Zr in molybdenum powder in an argon atmosphere through high-energy ball milling to prepare composite powder, mixing the composite powder and the pure molybdenum powder in proportion through low-energy ball milling, then performing powder curing through spark plasma sintering, separating out a nano Y-Zr-O composite oxide, and finally preparing the Y-Zr-O composite oxide. And the double-peak grain oxide dispersion strengthening molybdenum alloy is obtained.