High-niobium low-density refractory multi-principal-element alloy and vacuum drip casting method thereof

Abstract

The invention belongs to the technical field of metal material correlation, and discloses a high-niobium low-density refractory multi-principal-element alloy and a vacuum drip casting method thereof.The multi-principal-element alloy comprises niobium, aluminum, titanium and vanadium, the atomic ratios of niobium, aluminum, titanium and vanadium is 35-45:18.33-21.67:18.33-21.67:18.33-21.67, the phase structure of the multi-principal-element alloy is a single BCC structure, in the elements of the multi-principal-element alloy, the niobium is the main refractory element and achieves the main effect, due to the high niobium content, the alloy has the refractory and high toughness characteristics, the proper aluminum content is beneficial to keeping good inoxidizability and low density, the proper titanium content is beneficial to keeping good inoxidizability and certain toughness, the drip casting method is adopted, and the shortcoming that for a traditional drip casting technology, due to the large viscosity of the refractory multi-principal-element alloy, a small casting ingot with a certain size is difficultly prepared can be effectively overcome.

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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