A kind of high-strength high-entropy alloy nbmotawvcr and its preparation method

Abstract

The invention belongs to the technical field of high-entropy alloys and discloses a high-strength high-entropy alloy NbMoTaWVCr and a preparation method of the high-strength high-entropy alloy NbMoTaWVCr. According to the method, a forming method that a mechanical alloying technology and a spark plasma sintering technology are combined is adopted. Compared with a traditional vacuum arc furnace casting method, by the adoption of the forming process, operation is easier and more convenient, the temperature required in forming is lowered greatly, sintering time is short, a block material which is uniform in composition and near-total dense can be obtained through one-time sintering, and near-net forming is achieved; the microscopic structure of the NbMoTaWVCr high-entropy alloy obtained through the method is characterized in that granular precipitated phases are diffused in an isometric crystal matrix; and the NbMoTaWVCr high-entropy alloy is tiny in grain size and uniform in structure and has higher strength, hardness and wear resistance, and the optimum mechanical performance at the room temperature can meet the conditions that compression yield strength is 3,416.7 MPa, the maximum compressive strength is 3,834.3 MPa, and the plasticity dependent variable generated in fracture is 5.2%.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to a high-strength high-entropy alloy NbMoTaWVCr and a preparation method thereof. Background technique [0002] Traditional alloys are generally based on one or two elements, and by adding a small amount of alloying elements to achieve certain mechanical and physical properties, so as to meet specific use requirements. Today, the development of traditional alloy systems has become saturated, and the proposal of high-entropy alloys has broken through the framework of traditional alloy design, bringing the research and development of high-performance alloys into a new stage. High-entropy alloys can generally be defined as a type of alloy that is alloyed by five or more elements in an equiatomic ratio or close to an equiatomic ratio, and whose mixing entropy is higher than the melting entropy of the alloy, generally forming a high-entropy solid solution phase. High-entrop...

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Problems solved by technology

[0004] At present, the preparation of high-entropy alloy bulk materials is mainly based on vacuum arc furnace casting method. However, there are a series of insurmountable shortcomings in furnace casting. The casting process is relatively complicated, and there are problems of dendrite segregation and coarse grains, which will affect the mechanical properties of high-entropy alloys.