La2O3-microalloyed TiAl-based alloy being high in acid corrosion resistance

The invention provides a method for preparing a La2O3-microalloyed TiAl-based alloy being high in acid corrosion resistance. The method comprises the following steps: high-energy ball milling, cold-press forming and pressureless vacuum sintering. The La2O3-microalloyed TiAl-based alloy mainly comprises the following components: Ti powder, Al powder, V powder, Nb powder and La2O3 powder, and the nominal composition of the La2O3-microalloyed TiAl-based alloy is Ti-45Al-5V-4Nb-0.125La2O3 (at.%). After the prepared La2O3-microalloyed TiAl-based alloy prepared is corroded for 100 h, the alloy mass loss is 0.00366 g/cm ; compared with a La2O3-free alloy, the La2O3-microalloyed TiAl-based alloy has the advantage that the acid corrosion-resistant property is improved by 25 times and kept excellent; and the method provided by the invention serves as a TiAl-based alloy preparation method and has the advantage that the application scope of the TiAl-based alloy is broadened, that is, the TiAl-based alloy has wide application prospect when being applied to the fields of automobile, aerospace, navigation and the like as a corrosion-resistant material.