A method for improving the performance of high-entropy alloys by staged cryogenic treatment

A high-entropy alloy and cryogenic treatment technology is applied in the field of metal materials to achieve the effects of improving low-temperature mechanical properties, increasing processing time, and refining alloy structures.

Active Publication Date: 2021-10-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on high-entropy alloys mainly focuses on the influence of composition on the microstructure and various properties of high-entropy alloys. There are few studies on the use of cryogenic treatment to improve the properties of high-entropy alloys. The impact of cryogenic treatment on high-entropy alloys also inconclusive

Method used

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  • A method for improving the performance of high-entropy alloys by staged cryogenic treatment
  • A method for improving the performance of high-entropy alloys by staged cryogenic treatment
  • A method for improving the performance of high-entropy alloys by staged cryogenic treatment

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Experimental program
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Effect test

Embodiment 1

[0042] 1) Alloy preparation: According to the ratio of Al, Cr, Fe, Ni atomic ratio of 1: 1: 2: 2, using a single purity of 99.9%, and determined according to the mass percentage The quality of the metal (Al, Cr, Fe, Ni is 5.26 g, 10.13 g, 21.75 g, 22.86g, according to each alloy ingot 60g) and weighing, ingredient, and then put a good metal raw material In the vacuum arc smelting furnace, non-consumable arc smelting method under argon is protected, repeatedly turning the sample smelting 4 to 5 times, resulting in a uniform Al-Cr-Fe-Ni mother alloy ingot;

[0043] 2) Alloy material is constitutive processing: a block-shaped AlCrfe, an Al-Cr-Fe-Ni alloy ingot obtained in the step 1), using an electric discharge line cutting technique, a block AlCrFe of 8 mm × 8 mm × 6 mm 2 Ni 2 Alloy materials;

[0044] 3) Deep cold treatment: A liquid carbon dioxide environment is subjected to liquid carbon dioxide in a liquid carbon dioxide environment at a temperature of -75 to -85 ° C, AlCrfe is...

Embodiment 2

[0046] This embodiment is substantially the same as the examples, in particular

[0047] 1) preparing an alloy: This step is the same as first embodiment;

[0048] 2) setting treatment alloy material: This step is the same as first embodiment;

[0049] 3) cryogenic treatment: its liquid nitrogen cryogenic treatment, the prepared liquid nitrogen ambient at a temperature of -190 ~ -196 ℃ in) in the step 2 AlCrFe 2 Ni 2 The alloy was placed in 4 hours in which it was deeply cold, and then the sample was returned to room temperature, that is, the AlCrfe 2 Ni 2 The deep cooling process of high entropy alloy.

Embodiment 3

[0051] This embodiment is substantially the same as the examples, in particular

[0052] 1) preparing an alloy: This step is the same as first embodiment;

[0053] 2) setting treatment alloy material: This step is the same as first embodiment;

[0054] 3) cryogenic fractionation process: use of liquid carbon dioxide subjected to fractionation + nitrogen cryogenic process, the preparation of liquid carbon dioxide at ambient temperature in a -75 ~ -85 ℃) in step 2 AlCrFe 2 Ni 2 Wherein the alloy is placed for 2 hours, a cryogenic treatment, and then remove the sample placed directly in liquid nitrogen ambient at a temperature of -190 ~ -196 ℃ for 2 hours, remove the sample was returned to room temperature in air, i.e. complete AlCrFe 2 Ni 2 The classification process of high entropy alloy.

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Abstract

The invention relates to a method for improving the performance of high-entropy alloys by using graded cryogenic treatment. The preparation of high-entropy alloys in the as-cast state: melting the prepared high-purity metal raw materials in a vacuum arc melting furnace, and obtaining high-entropy alloys in the as-cast state after repeated melting. Entropy alloy sample; graded cryogenic treatment: soak the prepared high-entropy alloy sample in liquid carbon dioxide at -75~-85°C, then soak it in liquid nitrogen at -190~-196°C after taking out the sample In the process, the sample was taken out and returned to room temperature in air to complete the hierarchical cryogenic treatment of the high-entropy alloy. The invention does not need to change the alloy composition, and the structure of the high-entropy alloy is significantly refined through the step-by-step cryogenic treatment process, and the mechanical properties of the alloy can be greatly improved in the case of a short treatment time.

Description

Technical field [0001] The present invention belongs to the technical field of metal materials, and more particularly to a method of improving high entropy alloy properties using hierarchical deep cooling. Background technique [0002] High entropy alloy is a new type of alloy in the near future. It compared to other alloys, high entropy alloy has excellent performance such as high strength, high hardness, high processing hardening, high wear resistance, high temperature stability and corrosion resistance, so high entropy Alloy (HEA) has received wide concerns. At present, the research on high entropy alloy is mainly concentrated on the influence of the microstructure and various properties of high entropy alloys, and it is very small for improving high entropy alloy properties, and the impact of high entropy alloy is improved. It also has no conclusion. Inventive content [0003] Invention purpose: [0004] The present invention provides a method of using a class-level deep-coo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C22C30/00C22C1/02
CPCC22C1/02C22C30/00C22F1/00
Inventor 白鹤山尤俊华李承泽张维维刘苏杰曲迎东
Owner SHENYANG POLYTECHNIC UNIV
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