Multi-principal-component high-temperature alloy and preparation method thereof

Abstract

The invention discloses a multi-principal-component high-temperature alloy and a preparation method thereof. The preparation method adopts a forming technique combining mechanical alloying with discharge plasma sintering, an element Ti is added on the basis of four elements of Nb, Mo, Ta and W with high melting points, alloying is achieved when the elements are in solid states, the melting and solidifying processes are not required, a blocky material with the high performance can be obtained through only one-time solid phase sintering, and the problem that a smelting method is high in smeltingtemperature is solved, so that the machining temperature is reduced substantially, and a technology is simplified; and the defect that a NbMoTaW multi-principal-component high-temperature alloy system is low in room-temperature plasticity is overcome. The preparation method has the advantages of low preparation temperature, high efficiency, less energy consumption and the like; a prepared alloy matrix is of a single-phase body-centered cubic structure, uniform in structure and small in crystal grain, has relatively high strength and plasticity, and is obvious in fine grain strengthening and carbide dispersion strengthening effects.

Description

technical field [0001] The invention relates to a multi-principal superalloy and a preparation method thereof, and belongs to the technical field of metal materials and preparation thereof. Background technique [0002] Traditional superalloys, such as nickel-based superalloys, are usually dominated by one metal element, and other different alloying elements are added to form an alloy, which is easy to generate many intermetallic compounds. The alloy phase structure is complex, which makes the mechanical properties, corrosion resistance and microscopic properties of the alloy The structural stability is poor. Therefore, the concept of multi-principal alloy is proposed, which is easy to form a single-phase solid solution, and obtain a solid solution phase with high thermal stability and a nanostructure or even an amorphous structure. It has high strength, high hardness, and high wear resistance. , high oxidation resistance, high corrosion resistance and other excellent proper...

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Problems solved by technology

These two multi-principal superalloys have great advantages over traditional nickel-based superalloys, but they have poor plastic rheology and low ductility at room temperature.

At the same time, superalloys have high requirements on the preparation temperature, and the production cost and difficulty of using the traditional vacuum arc melting method are relatively high. Metals or alloys need to go through the process of resolidification from solid to liquid, and there will inevitably be component segregation; The problem of unevenness requires multiple remelting; at the same time, the size and shape of the molded parts are also difficult to guarantee, and the grains of the material are easy to coarsen after molding. Therefore, it is necessary to consider improving the preparation process to solve the problems caused by the casting method.

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