A high-niobium low-density refractory multi-principal element alloy and its vacuum drop casting method

Abstract

The invention belongs to the technical field related to metal materials, and discloses a high-niobium, low-density refractory multi-principal alloy and a vacuum drop casting method thereof. The constituent elements of the multi-principal alloy include niobium, aluminum, titanium and vanadium, and the niobium , the atomic ratio of the aluminum, the titanium and the vanadium is (35-45): (18.33-21.67): (18.33-21.67): (18.33-21.67), and the phase of the multi-principal alloy The structure is a single BCC structure. Among the constituent elements of the multi-principal alloy, niobium is the main refractory element and plays a major role. The high niobium content makes the alloy have refractory and high toughness characteristics, and the moderate aluminum content is conducive to maintaining good oxidation resistance and low density. , the moderate titanium content is conducive to maintaining good oxidation resistance and certain toughness; and the drop casting method is used to effectively make up for the difficulty of preparing a small ingot of a certain size due to the high viscosity of the refractory multi-principal alloy in the traditional suction casting technology lack of.

Description

technical field [0001] The invention belongs to the technical field related to metal materials, and more specifically relates to a high-niobium, low-density refractory multi-principal alloy and a vacuum drop casting method thereof. Background technique [0002] Multi-principal alloy is a novel alloy design concept proposed in recent years. Its concept expands the composition range of traditional alloys and greatly enriches the types of alloy materials. Generally, the mole percentage of each element in the alloy is required to be 5%. above. [0003] Since the design concept of multi-principal alloys was put forward, it has attracted widespread attention and active exploration in the scientific community. Scholars’ research on multi-principal alloys has shown that because there are many types of metal elements in the alloy and the disorder of the elements is large, the alloy after solidification Not only does it not form a large number of intermetallic compounds like traditio...

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Problems solved by technology

[0010] Aiming at the above defects or improvement needs of the prior art, the present invention provides a high-niobium low-density refractory multi-principal alloy and its vacuum drop casting method. Poor plasticity at room temperature and the difficulty of preparing small ingots (or castings), the present invention adopts the method of preparing a titanium-aluminum master alloy first, and then mixing and melting the master alloy with other elements, which can effectively avoid the problem caused by the boiling point of aluminum ( 2327°C) is lower than the melting point of niobium (2750°C), resulting in the violent volatilization of aluminum during the smelting process to ensure the accuracy of the composition; at the same time, the drop casting method is used to effectively compensate for the low viscosity of the refractory multi-principal alloy due to the traditional suction casting technology. Large and difficult to prepare small ingots of a certain size, it can quickly prepare high-purity small ingots (castings) of various sizes and specifications

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