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A Cu-containing high-entropy alloy coating with liquid phase separation structure and preparation method thereof

A high-entropy alloy and liquid-phase separation technology, applied in metal material coating process, coating and other directions, can solve the problem of rare high-entropy alloy composition, and achieve the effects of high hardness, cost reduction and coating toughness improvement.

Active Publication Date: 2018-05-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the reported high-entropy alloy components contain Fe, Co, Ni, Cr, Cu and other main alloying elements. Although most of Cu and other alloying There are many elements in the alloy and the copper content generally does not exceed 35%. The high atomic disorder of the high-entropy alloy limits the separation of the copper-rich liquid phase from the melt.
At present, there are few reported high-entropy alloy components that can form liquid-phase-separated structures, and there is no simple and feasible solution to make high-entropy alloy coatings form liquid-phase separated structures during laser cladding, thereby regulating high-entropy alloys through two-phase structures. Properties of Entropy Alloys

Method used

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  • A Cu-containing high-entropy alloy coating with liquid phase separation structure and preparation method thereof
  • A Cu-containing high-entropy alloy coating with liquid phase separation structure and preparation method thereof
  • A Cu-containing high-entropy alloy coating with liquid phase separation structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A Cu-containing high-entropy alloy coating with a liquid phase separation structure, which is obtained by alloying five or more metal or non-metal elements in an equiatomic ratio or close to an equiatomic ratio, in addition to adding different amounts of Nano Y 2 o 3 , nano Y 2 o 3 The particle size distribution is between 20 and 100nm. In this embodiment, four kinds of high-entropy alloy powders are prefabricated, which are respectively recorded as 0.5% Y 2 o 3 -AlCoCrCuFeNiSi 0.5 , 1%Y 2 o 3 -CoCrCu 2FeNi, 2% Y 2 o 3 - AlCoCrCuFeNi and 3% Y 2 o 3 - CoCrCuFeNi, where, 0.5% Y 2 o 3 -AlCoCrCuFeNiSi 0.5 Y in high entropy alloys 2 o 3 The mass fraction is 0.5%, and the molar ratio of other metal elements is: Al:Co:Cr:Cu:Fe:Ni:Si=1:1:1:1:1:1:0.5; 1%Y 2 o 3 -CoCrCu 2 Y in FeNi high entropy alloy 2 o 3 The mass fraction is 1%, and the molar ratio of other metal elements is: Co:Cr:Cu:Fe:Ni=1:1:2:1:1; 2%Y 2 o 3 -Y in AlCoCrCuFeNi high entropy alloy 2 o ...

Embodiment 2

[0036] A Cu-containing high-entropy alloy coating with a liquid phase separation structure, which is obtained by alloying five or more metal or non-metal elements in an equiatomic ratio or close to an equiatomic ratio, in addition to adding different amounts of Nano Y 2 o 3 , nano Y 2 o 3 The particle size distribution is between 20 and 100nm. In this embodiment, two kinds of high-entropy alloy powders are prefabricated, respectively denoted as 0.5% Y 2 o 3 -CuCo 0.5 Ni 1.2 CrAl 1.5 Fe 1.5 and 2.5% Y 2 o 3 -CuCrCoMoAl 1.5 Ti, of which, 0.5% Y 2 o 3 -CuCo 0.5 Ni 1.2 CrAl 1.5 Fe 1.5 Y in high entropy alloys 2 o 3 The mass fraction is 0.5%, and the molar ratio of other metal elements is: Cu:Co:Ni:Cr:Al:Fe=1:0.5:1.2:1:1.5:1.5; 2.5%Y 2 o 3 -CuCrCoMoAl 1.5 Y in Ti high entropy alloy 2 o 3 The mass fraction is 2.5%, and the molar ratio of other metal elements is: Cu:Cr:Co:Mo:Al:Ti=1:1:1:1:1.5:1; the purity of various metal powders in this embodiment is all ≥ ...

Embodiment 3

[0041] A Cu-containing high-entropy alloy coating with a liquid phase separation structure, which is obtained by alloying five or more metal or non-metal elements in an equiatomic ratio or close to an equiatomic ratio, in addition to adding different amounts of Nano Y 2 o 3 , nano Y 2 o 3 The particle size distribution is between 20 and 100nm. In this embodiment, two kinds of high-entropy alloy powders are prefabricated, respectively denoted as 0.8% Y 2 o 3 -CoCrCuFeNiAl 1.2 Ti 0.5 and 1.5% Y 2 o 3 -Al 1.2 CuNi 0.8 CrFe, of which, 0.8% Y 2 o 3 -CoCrCuFeNiAl 1.2 Ti 0.5 Y in high entropy alloys 2 o 3The mass fraction is 0.8%, and the molar ratio of other metal elements is: Co:Cr:Cu:Fe:Ni:Al:Ti=1:1:1:1:1:1.2:0.5; 1.5%Y 2 o 3 -Al 1.2 CuNi 0.8 Y in CrFe high entropy alloy 2 o 3 The mass fraction of the metal elements is 1.5%, and the molar ratio of other metal elements is: Al:Cu:Ni:Cr:Fe=1.2:1:0.8:1:1; the purity of various metal powders in this embodiment is ...

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Abstract

The invention discloses a Cu-containing high-entropy alloy coating with a liquid phase separation structure and a preparation method thereof, belonging to the field of alloy material design. The invention adds a small amount (mass fraction of 0.5-3%) nanometer Y2O3 to the Cu-containing high-entropy alloy composition, which can promote the laser cladding Cu-containing high-entropy alloy coating to form a liquid phase separation structure. The copper-containing high-entropy alloy is composed of 5 or more metal or non-metallic elements, and the content of the Cu element that must be added accounts for 15-35% of the total moles of the high-entropy alloy components. In the present invention, due to the large surface effect and small size effect of nano-Y2O3, it can promote the separation of liquid phase copper from the alloy melt when the laser cladding copper-containing high-entropy alloy coating is fused, and the in-situ self-generation on the solidified matrix structure of the coating A large number of dispersed copper-rich phase particles change the single-phase structure of the coating, providing a new method for designing multi-phase structures and expanding properties of high-entropy alloys through liquid phase separation.

Description

technical field [0001] The invention belongs to the field of alloy material design, and more specifically relates to a Cu-containing high-entropy alloy coating with a liquid phase separation structure and a preparation method thereof. Background technique [0002] Due to its unique high entropy effect, slow diffusion effect, nanophase strengthening and ultra-high lattice distortion, multi-principal high-entropy alloys have many excellent properties such as high hardness, high temperature resistance, and corrosion resistance, and are gradually being favored by alloy materials. designer's attention. The design range of its alloy composition is from 5 to 11 main alloy elements in equimolar ratio or nearly equimolar ratio. Due to its high mixing entropy effect, it can generally avoid a large number of nucleation of complex intermetallic compounds after solidification, and mostly form face-centered cubic (fcc) and body-centered cubic (bcc) single-phase structures dominated by si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10B22F1/00C22C30/02
Inventor 张晖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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