Tantalum-reinforced high strength nickel-niobium alloy material is prepared by batching, mixing, compacting and hot pressing sintering. 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.
A high strength nickel-niobium alloy material is characterized in that the nickel-niobium alloy contains the following components by weight percentage: 6.0 ~ 10.0% of Nb, 2.0 ~ 4.0% of Sc, 0.5 ~ 1.0% of C, 2.0 ~ 3.0% of Ta, 1.0 ~ 2.0% of Al, 0.5 ~ 1% of La, 0.5 ~ 1% of Pr, the remainder of nickel and the inevitable impurities; And the preparation method of the nickel-niobium alloy material.
