Boron-containing high-entropy alloy coating and preparation method thereof

Abstract

The invention provides a boron-containing high-entropy alloy coating and a preparation method thereof, and belongs to the field of alloy coatings. Some B atoms are adopted as self-fluxing atoms to be subjected to solid solution in a solid solution body of the face-centered cubic structure, the hardness of the coating is improved, granular and short rod-like M2B hard phases are separated out in a coating base, and due to separation of the hard phases, one one hand, the dispersion strengthening effect is achieved; on the other hand, the solid solution reinforcing effect is lowered, the coating hardness is lowered, and due to the hardness improving effect of dispersion strengthening, solid phase strengthening is greatly offset, the influence of the coating hardness is lowered, finally, the coating hardness is still improved, and a boron element is adopted as a secondary element to be added into high-entropy alloy; due to the gap effect of non-metal elements, the alloy stacking fault energy is improved, lattice deformation is increased, the solid solution strengthening effect is achieved, the non-metal element and the main element can form borides to be dispersed into alloy tissue, the dispersion strengthening effect is generated, and therefore the hardness and corrosion resistance of the high-entropy alloy are improved.

Description

technical field

[0001] The invention relates to the technical field of alloy coatings, in particular to a boron-containing high-entropy alloy coating and a preparation method thereof. Background technique

[0002] Metals and their alloys have a long history. In 2004, Cantor et al. proposed a new alloy design concept, and called such alloys multicomponent alloys and high entropy alloys. Unlike traditional alloys, high-entropy alloys are not based on one or two elements. In terms of composition, they contain at least five main elements, and the atomic ratio of each element is between 5% and 35% (at%). ; From the perspective of entropy, the mixing entropy of alloys includes atomic vibration entropy, magnetic moment entropy, electron random entropy and atomic arrangement entropy, among which atomic arrangement entropy is dominant. Entropy can only consider the entropy of atomic arrangement, that is, △S=Rlnn, when △S>1.5R, it is a high-entropy alloy. High-entropy alloys have...

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