TiZrVNb-based high-entropy alloy containing rare earth elements and preparation method thereof

Abstract

The invention relates to a TiZrVNb-based high-entropy alloy containing rare earth elements and a preparation method thereof, and belongs to the technical field of TiZrVNb-system high-entropy alloys. The chemical formula of the high-entropy alloy is briefly named as TiaZrbNbcVdMeAf according to the atomic ratio, M is at least one of Al, Hf, Ta, W, Mn, Cu, Cr, Fe, Mg, Be, Li, Mo, Co, Ni, Si, B, O and N, A is at least one of Y, La, Er, Sc, Nd, Gd and Ce. According to the TiZrVNb-based high-entropy alloy containing the rare earth elements and the preparation method thereof, grain refinement under a common smelting technology is achieved mainly by adding the rare earth elements to increase component supercooling, reduce a critical nucleation radius and form a rare earth oxide pinning grain boundary. On the basis of keeping high strength and high plasticity of the TiZrVNb-based high-entropy alloy, the work hardening rate of the TiZrVNb-based high-entropy alloy is obviously increased. In addition, the high-entropy alloy can be prepared by adopting a smelting technology, subsequent deformation and heat treatment are not needed, the preparation process is simple, the production efficiency is high, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a TiZrVNb-based high-entropy alloy containing rare earth elements and a preparation method thereof, belonging to the technical field of TiZrVNb system high-entropy alloys. Background technique [0002] High-entropy alloy is a new type of multi-principal alloy based on the concept of "entropy". It breaks the traditional design idea that one element is the main element of the alloy. It not only provides a new concept for alloy composition design, but also provides customization for different applications. Materials in demand offer opportunities for change. Using the multi-principal element characteristics of high-entropy alloys, a variety of low-density elements are mixed together to design and prepare TiZrVNb-based series high-entropy alloys (CN201811500843.2), which exhibit low density, high strength and good plasticity, etc. Advantages, is expected to become a new generation of lightweight structural materials. [0003] At p...

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Problems solved by technology

[0004] Aiming at the deficiencies in the preparation of TiZrVNb-based high-entropy alloys by smelting and deformation heat treatment technology, the present invention provides a TiZrVNb-based high-entropy alloy containing rare earth elements and a preparation method thereof, by adding rare earth elements to increase component supercooling and reduce critical nucleation radius , and the formation of rare earth oxide pinning grain boundaries, which realizes grain refinement under ordinary smelting technology, and significantly improves its work hardening rate on the basis of maintaining the high strength and high plasticity of TiZrVNb-based high-entropy alloys

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