A kind of scandium and tantalum reinforced high strength nickel-niobium alloy material is provided, which is prepared by batching, mixing, compacting and hot pressing sintering steps. Scandium and tantalum as beneficial alloying elements are introduced into the alloy. Meanwhile, niobium reduces the content of aluminum in the alloy and ensures the alloy has good plasticity and toughness. Low cost and high strength alloy materials with high strength and wear resistance were obtained by means of hot pressing sintering. By adding lanthanum and praseodymium, the microstructure of the alloy was refined, the strength of the alloy was further enhanced, and the mechanical properties of the alloy at room temperature and high temperature were maintained.
In the development process of aviation and aerospace industry, the development of advanced materials is crucial to the progress of aviation and aerospace technology. Based on the need to save energy and reduce pollution, aviation and aerospace structural materials are required not only to withstand high temperature but also to have high specific strength and stiffness. Nickel-niobium alloy is considered as one of the potential candidate materials for high temperature light alloy due to its high melting point, high specific strength and modulus, low creep rate, relatively small density, good thermal conductivity and high temperature oxidation resistance. However, the poor plasticity at room temperature and high temperature strength of Ni-Nb alloy limit its wide application. At present, there are many methods for the synthesis and preparation of Ni-Nb intermetallics and their alloys, such as alloy melting, plasma sintering, combustion synthesis, mechanical alloying and hot isostatic pressing. However, these methods have some shortcomings more or less.
The microstructure of Ni-Nb intermetallics is very stable, and the formation energy is high, reaching a maximum of 82kJ/mol. In the development of Ni-Nb alloy, alloying and composite technology have always been the two most important means to improve the microstructure and properties of Ni-Nb alloy. In fact, people have not stopped the exploration of the influence of metal elements on the microstructure and properties of Ni-Nb alloy. However, the influence of metal elements on the strength and plasticity of Ni-Nb alloy and its mechanism are still unclear and still controversial.
In addition, the influence law and mechanism of ceramic particles on the properties of Ni-Nb alloy still need to be further revealed, and the research on improving the strength and plasticity of Ni-Nb alloy is still an urgent problem to be solved in the world. It is not clear how the types and contents of metal elements and the structure, size, shape, quantity and distribution of endogenous ceramic particles affect the strength and plasticity of Ni-Nb alloy. Many researchers try to add a certain amount of multiphase ceramics to Ni-Nb alloy in order to obtain better comprehensive mechanical properties. For example, Ni powder, Nb powder, carbon black and Al powder are used as raw materials to prepare Ni-Nb matrix composites. Due to the addition of composite ceramics, the strength of Ni-Nb alloy is significantly improved. After HIP treatment, the strength is further improved, but the high temperature strength of Ni-Nb alloy is not significantly improved.
