High-strength and high-plasticity high-entropy alloy and preparation method thereof

A high-entropy alloy and high plasticity technology, applied in the field of high-entropy alloy and its preparation, can solve the problem of low strength, achieve the effect of improving strength and plasticity, simple method, and reducing preparation cost

Active Publication Date: 2020-11-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CoCrFeNi high-entropy alloy has a single FCC phase. It has very good corrosion resistance, high temperature resistance and plasticity, but its strength is low. Improving its performance in different ways has become a hot research topic.

Method used

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  • High-strength and high-plasticity high-entropy alloy and preparation method thereof
  • High-strength and high-plasticity high-entropy alloy and preparation method thereof
  • High-strength and high-plasticity high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Use fine sandpaper to remove the oxide scales on the surface of metal Co, Cr, Fe, Ni, and then use absolute ethanol to perform ultrasonic cleaning to obtain a clean metal block; weigh the total amount according to the molar ratio of 1:1:1:1 Mixed raw materials with a mass of 70g;

[0028] (2) Repeatedly smelting the weighed raw materials in a high-purity Ar gas environment in a high-vacuum arc melting furnace;

[0029] (3) The alloy melted in the step (2) is cast into an ingot at a temperature of 1000° C. for 12 hours, subjected to homogenization heat treatment, and then taken out of water and quenched to room temperature to obtain a homogenized state high-entropy alloy.

[0030] Experimental results:

[0031] The high-entropy alloy prepared above was coarsely ground step by step with different types of sandpaper, finely ground to #1600, and then mechanically polished until there were no obvious scratches on the surface, and the alloy was corroded with a metallogra...

Embodiment 2

[0034] (1) Use fine sandpaper to remove the oxide skin on the surface of metal Co, Cr, Fe, Ni, Al-10Er, and then use absolute ethanol to perform ultrasonic cleaning to obtain a clean metal block; according to the molar ratio of 1:1:1:1 : 0.05 Weigh out the mixed raw material that total mass is 70g;

[0035] (2) Repeatedly smelting the weighed raw materials in a high-purity Ar gas environment in a high-vacuum arc melting furnace;

[0036] (3) The alloy melted in the step (2) is cast into an ingot at a temperature of 1000° C. for 12 hours, subjected to homogenization heat treatment, and then taken out of water and quenched to room temperature to obtain a homogenized state high-entropy alloy.

[0037] Experimental results:

[0038] The high-entropy alloy prepared above was coarsely ground step by step with different types of sandpaper, finely ground to #1600, and then mechanically polished until there were no obvious scratches on the surface, and the alloy was corroded with a me...

Embodiment 3

[0041] A preparation method of a high-strength high-plastic high-entropy alloy, the specific steps are as follows:

[0042] (1) Use fine sandpaper to remove the oxide skin on the surface of metal Co, Cr, Fe, Ni, Al-10Er, and then use absolute ethanol to perform ultrasonic cleaning to obtain a clean metal block; according to the molar ratio of 1:1:1:1 : 0.05 Weigh out the mixed raw material that total mass is 70g;

[0043] (2) Repeatedly smelting the weighed raw materials in a high-purity Ar gas environment in a high-vacuum arc melting furnace;

[0044] (3) Casting the alloy melted in step (2) into an ingot at a temperature of 1000°C for 12 hours, performing a homogenization heat treatment, and then taking out the water and quenching to room temperature to obtain a homogenized state high-entropy alloy;

[0045] (4) Cut the homogenized heat-treated alloy ingot in step (3) into 16×16×4mm samples, and carry out 4 passes of rolling at 650°C, each time the reduction is 0.5mm, and t...

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Abstract

The invention discloses a high-strength and high-plasticity high-entropy alloy and a preparation method thereof, and belongs to the technical field of metal materials and manufacturing. The high-entropy alloy is prepared from the following raw materials of metal particles of Co, Cr, Fe and Ni and intermediate alloy particles of Al-10Er (the mass fraction of Er is 10%). The preparation method specifically comprises the following steps that the metal particles are weighed according to the set proportion, melted in a high-vacuum electric arc melting furnace and then solidified in a copper mold soas to prepare a high-entropy alloy, wherein in order to ensure the uniformity of alloy components in the smelting process, alloy blocks need to be repeatedly smelted; and the as-cast high-entropy alloy prepared in the initial stage is homogenized in a high-temperature heat treatment furnace, then water quenching is carried out, the high-entropy alloy ingot is rolled at the temperature of 500-800DEG C, and the rolled sample is cooled along with air to obtain the high-strength and high-plasticity high-entropy alloy. The high-entropy alloy prepared by using the preparation method has excellentmechanical properties, and the preparation process is simple.

Description

technical field [0001] The invention relates to a high-strength and high-plastic high-entropy alloy and a preparation method thereof, belonging to the technical field of metal materials and their preparation. Background technique [0002] Traditional alloys are generally based on one or two elements, and some specific performance requirements can be achieved by adding a small amount of other elements. With the further development of the alloy design concept, at the beginning of the 21st century, Taiwan scholar Ye Junwei broke through the traditional alloy design concept and took the lead in proposing the design idea of ​​"high-entropy alloy", that is, the number of principal elements in the alloy is not less than 5, and each principal element The molar ratio of yuan is between 5% and 35%. High-entropy alloys have high-entropy effects, can form simple solid solution structures, and do not appear complex intermetallic compounds. The number of phases obtained is far lower than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C30/00C22F1/00
CPCC22C1/03C22C30/00C22F1/00C22F1/002
Inventor 廖恒成黄艾婧周军陈浩
Owner SOUTHEAST UNIV
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