Low-temperature-wear-resistant medium-entropy alloy and preparation method thereof

A technology of entropy alloy and low temperature resistance, which achieves the effects of overcoming brittle spalling, high production efficiency, improving mechanical properties and wear resistance

Pending Publication Date: 2022-06-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]In particular, the mutual contact and wear of structural materials is unavoidable in industrial production and equipment operation, which can easily pose a serious threat to key components of equipment, and further lead to major security incidents
Furthermore, traditional alloy materials often undergo ductile-brittle transition in severe extreme cold environments such as aerospace, deep sea, and polar regions, which greatly reduces the wear life of the material, which in turn leads to serious wear failure during service.

Method used

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  • Low-temperature-wear-resistant medium-entropy alloy and preparation method thereof
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  • Low-temperature-wear-resistant medium-entropy alloy and preparation method thereof

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preparation example Construction

[0037] A preparation method of a low-temperature wear-resistant medium-entropy alloy, comprising the following steps:

[0038]S1. Ingredients and surface treatment of raw materials: according to the atomic ratio of 1:1:1, weigh 15.33g of high-purity Cr, 17.37g of high-purity Co, and 17.30g of high-purity Ni, and use sandpaper or a grinder to clean the surface of the single substance Grind to remove scale and impurities, then use absolute ethanol to sonicate the simple substances of each element for 20-30 minutes, dry them with a hair dryer, and mix them for use.

[0039] S2. Alloy smelting and suction casting: Put the prepared Co, Cr, and Ni elements into the copper mold crucible of the vacuum arc melting furnace, and put a Ti ingot in the furnace at the same time, and use the mechanical pump and the molecular pump to evacuate to The vacuum degree in the chamber reaches 0.5~1×10 -4 MPa, fill the chamber with high-purity Ar gas to 0.05-0.08MPa, and use a high-frequency DC powe...

Embodiment 1

[0047] Example 1:

[0048] A preparation method of a low-temperature wear-resistant medium-entropy alloy, comprising the following steps:

[0049] S1. Ingredients and surface treatment of raw materials: according to the atomic ratio of 1:1:1, weigh 15.33g of high-purity Cr, 17.37g of high-purity Co, and 17.30g of high-purity Ni, and use sandpaper or a grinder to clean the surface of the single substance Grinding was carried out to remove scale and impurities, and then each element was ultrasonicated for 30 minutes with absolute ethanol, dried with a hair dryer, and mixed for use.

[0050] S2. Alloy smelting and suction casting: Put the prepared Co, Cr, and Ni elements into the copper mold crucible of the vacuum arc melting furnace, and put a Ti ingot in the furnace at the same time, and use the mechanical pump and the molecular pump to evacuate to The vacuum degree in the chamber reaches 1×10 - 4 MPa, fill the chamber with high-purity Ar gas to 0.05MPa, and use a high-frequ...

Embodiment 2

[0053] Example 2:

[0054] A preparation method of a low-temperature wear-resistant medium-entropy alloy, comprising the following steps:

[0055] S1. Ingredients and surface treatment of raw materials: according to the atomic ratio of 1:1:1, weigh 15.33g of high-purity Cr, 17.37g of high-purity Co, and 17.30g of high-purity Ni, and use sandpaper or a grinder to clean the surface of the single substance Grinding was carried out to remove scale and impurities, and then each element was ultrasonicated for 30 minutes with absolute ethanol, dried with a hair dryer, and mixed for use.

[0056] S2. Alloy smelting and suction casting: Put the prepared Co, Cr, and Ni elements into the copper mold crucible of the vacuum arc melting furnace, and put a Ti ingot in the furnace at the same time, and use the mechanical pump and the molecular pump to evacuate to The vacuum degree in the chamber reaches 1×10 - 4 MPa, fill the chamber with high-purity Ar gas to 0.05MPa, and use a high-frequ...

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Abstract

The invention relates to a low-temperature-wear-resistant CoCrNi medium-entropy alloy and a preparation method thereof.The preparation method includes the steps that metal elementary substances Co, Cr and Ni are smelted through a vacuum electric arc, and a CoCrNi alloy ingot is obtained through a copper mold suction casting method; carrying out homogenization treatment on the alloy ingot by using a box-type heat treatment furnace so as to ensure uniform element distribution of the alloy ingot; and a rolling mill is used for conducting one-way rolling in the length direction of the alloy ingot, and then medium-temperature annealing is conducted in a box-type heat treatment furnace. The obtained CoCrNi medium-entropy alloy has a single-phase FCC solid solution structure, the internal structure shows two different grain structures, and the balance between strength and plasticity is overcome in performance, so that the wear resistance of the alloy material is improved, and the effect is particularly remarkable in a low-temperature environment. The preparation method provided by the invention is simple, convenient and easy to operate, has a remarkable effect of improving the wear resistance of the alloy material, and is an optimal candidate material for wear-resistant components applied under extremely low-temperature working conditions such as spaceflight, deep sea and polar regions.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant alloy materials, and relates to a low-temperature wear-resistant medium-entropy alloy and a preparation method thereof. Background technique [0002] Since the high-entropy alloy was proposed in 2004, it has attracted extensive attention from researchers because of its unique composition, microstructure and tunable properties. Due to its unique high entropy effect, it is easier to form a simple disordered solid solution structure rather than a brittle intermetallic compound. therefore. High-entropy alloys often have excellent performance characteristics such as high strength, high ductility, and high oxidation resistance, and show great application potential in practical engineering. However, with the in-depth research on high-entropy alloys, it has been found that medium-entropy alloys composed of three equiatomic ratios or near-equalatomic ratios exhibit better mechanical properties, am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16
CPCC22C30/00C22C1/02C22F1/16
Inventor 周青黄卓斌刘筱容任越王海丰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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