Because the resistance to helium ion sputtering of vanadium alloy is closely related to the content of dissolved oxygen in the alloy and the size of the grain, by adding the intermediate alloy containing rare earth elements in the alloy, the rare earth elements can take the dissolved oxygen in the vanadium alloy matrix to form rare earth oxides, so as to realize the purification and grain refinement of the alloy. The alloy prepared by the invention is V-Cr-Ti-Y alloy, which is based on the V-Cr-Ti ternary alloy system, takes Cr and Ti as the main alloy elements, and then forms rare earth oxides in the smelting process by simple alloying means, using the strong affinity of rare earth elements to oxygen. In this way, It reduces the content of dissolved oxygen in the alloy and improves the phenomenon of oxygen embrittlement. On the other hand, the yttrium oxide formed in the high-temperature molten vanadium can be used as a grain refiner during the cooling and solidification process of vanadium alloy molten. The effective combination of these two aspects can greatly enhance the resistance of vanadium alloy to helium ion sputtering.
Based on the V-Cr-Ti ternary alloy system, Cr and Ti are taken as the main alloying elements. Through simple alloying means, the content of dissolved oxygen in vanadium alloy is effectively reduced by the strong affinity of rare earth element y to oxygen, and the as-cast grain size is refined, and then the processing means of plastic deformation is combined. the yttrium oxide with excellent high temperature performance is diffusely distributed in the matrix, which effectively nails the grain boundary and impedes the dislocation movement during the deformation process, so that the grain size of the alloy is significantly refined and homogenized, and the bremsstrahlung of the alloy is greatly improved. Compared with the V-4Cr-4Ti alloy under the same preparation process, the surface bubblage and peeling appearance of the vanadium alloy prepared by the invention are significantly reduced under the condition of the same time of helium ion sputtering with the same beam.
Adding yttrium-containing intermediate alloy to improve alloy properties is generally used in magnesium alloy and iron and steel materials. The inventor of this application firstly applied Yttrium-containing intermediate alloy to vanadium alloy square surface through in-depth theoretical research and combined with practice. In this design, due to the very active chemical properties of yttrium metal, it is easy to be oxidized when added, so the present invention can better improve the environmental oxidation of yttrium by adding it in the form of an intermediate titanium yttrium alloy, so as to control the oxygen content in the vanadium alloy. The average grain size of the alloy ingot is significantly reduced compared with the proportional alloy ingot prepared under the same melting conditions, and the toughness of the Ffan alloy ingot after grain refinement is significantly increased, so it is not easy to crack in the subsequent deformation treatment, such as this also effectively improves the yield of the product, and the preparation process has good repeatability.
