Nitrogen-reinforced FeCrCoMnNi high-entropy alloy and preparation method thereof

Abstract

The invention belongs to the technical field of high-entropy alloys, and particularly relates to a nitrogen-reinforced FeCrCoMnNi high-entropy alloy and a preparation method of the nitrogen-reinforcedFeCrCoMnNi high-entropy alloy. The preparation method comprises the following steps of casting the nitrogen-reinforced FeCrCoMnNi high-entropy alloy into a plate with the thickness of 2mm-8 mm; carrying out surface oxidation removing treatment on the cast nitrogen-reinforced FeCrCoMnNi high-entropy alloy; performing strong-heat shearing deformation processing by adopting a stirring friction process; and carrying out large-area plate or pipe preparation and surface modification on the nitrogen-reinforced FeCrCoMnNi high-entropy alloy through a horizontal adjacent processing region lap joint process. The nitrogen-reinforced FeCrCoMnNi high-entropy alloy and the preparation method of the nitrogen-reinforced FeCrCoMnNi high-entropy alloy are provided. The high-entropy alloy has the characteristics of homogenization and super-refinement. The preparation method not only can be used for rapidly and effectively eliminating cast-state macroscopic segregation problems, but also enables the nitrogen-reinforced high-entropy alloy to have a super-refined grain structure, high strength and high ductility.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, and in particular relates to a nitrogen-strengthened FeCrCoMnNi high-entropy alloy and a preparation method thereof. Background technique [0002] The unique high entropy effect, slow diffusion effect, severe lattice distortion effect and "cocktail" effect of high entropy alloy make it have high strength, high hardness, good wear resistance, corrosion resistance, fatigue resistance, and excellent Low-temperature and high-temperature mechanical properties have shown broad application prospects in many fields. Basic research on the design, preparation and application of high-entropy alloys has become a research hotspot in the field of advanced metal materials. [0003] The earliest proposed typical high-entropy alloy is FeCrCoMnNi alloy, which has a stable face-centered cubic crystal structure and high ductility, but its strength is low. In order to further improve the strength of the...

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Problems solved by technology

However, in the postgraduate thesis "The Influence of N Atoms on the Structure and Properties of FeCrCoMnNi High-Entropy Alloys" directed by the inventor of the invention patent (CN 107760963 B), it has been found that due to the obvious composition segregation problem in the ingot, it is very easy to cause forging or heat loss. The problem of cracking when rolling

This not only limits the thermal deformation fragmentation of dendrites in cast FeCrCoMnNi high-entropy alloy ingots, but also limits the dynamic recrystallization grain refinement under large strains.

If high temperature (above 1200°C) and long time (generally 12-24 hours) annealing is used to eliminate the problem of composition segregation, not only the energy consumption is high, the cycle is long and the grain size is coarse

Although cold rolling and annealing are common methods to refine the metal structure and increase the strength, they need to change the shape and size of the initial workpiece, which is only suitable for the preparation of high-entropy alloy sheets

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