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Preparation method of ultra-fine grain high-entropy alloy

A high-entropy alloy and ultra-fine grain technology, applied in the field of metal materials and processing, can solve the problems of difficulty in the production and application of large-sized products, low strength, etc., and achieve the effects of high production efficiency, simple equipment and wide application prospects.

Active Publication Date: 2018-06-19
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

[0004] The present invention adopts the method for preparing ultra-fine-grained high-entropy alloys by strong deformation rolling and heat treatment technology, and prepares fine-grained FeCoCrNiMn series high-entropy alloys with high strength and high toughness, which solves the problem of high-entropy alloys, especially FeCoCrNiMn series high-entropy alloys. The relative strength of entropy alloys is low, and after the alloy structure is ultra-fine, traditional SPD preparation technology is difficult to realize the production and application of large-scale products and other technical problems

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  • Preparation method of ultra-fine grain high-entropy alloy
  • Preparation method of ultra-fine grain high-entropy alloy
  • Preparation method of ultra-fine grain high-entropy alloy

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Embodiment 1

[0032] The high entropy alloy of this embodiment is composed of the following atomic percentages: Fe 20%, Co 20%, Ni 20%, Cr 20%, Mn 20%.

[0033] The preparation method of the above-mentioned ultrafine-grained high-entropy alloy, the specific operation steps are as follows:

[0034] (1) Alloy smelting: 99.5% pure metal is used, and the furnace is loaded after batching according to the above ingredients, smelted in a vacuum furnace, tested before the furnace and adjusted to the requirements, and cast into ingots at a casting temperature of 1550°C;

[0035] (2) Homogenization heat treatment

[0036] Plate-like as-cast high-entropy alloys, sample size: 12 mm thick x 30 mm wide x 100 mm long, were subjected to homogenization heat treatment at 1150° C. for 12 hours, and then water-cooled. The purpose is to eliminate the defects and alloy element segregation caused by the smelting process as much as possible.

[0037] (3) Large deformation rolling

[0038] Grind the four surface...

Embodiment 2

[0043] The high entropy alloy of this embodiment is composed of the following atomic percentages: Fe 19%, Co 19%, Ni 19%, Cr 19%, Mn 20%, Al 4%.

[0044] The preparation method of the above-mentioned ultrafine-grained high-entropy alloy, the specific operation steps are as follows:

[0045] (1) Alloy smelting: 99.5% pure metal is used, and the furnace is charged after batching according to the above ingredients, vacuum induction (VIM) and electroslag remelting (ESR). The casting temperature is 1600°C.

[0046] (2) Homogenization heat treatment

[0047] Plate-shaped as-cast high-entropy alloy, sample size: thickness 16mm×width 30mm×length 100mm, was subjected to homogenization heat treatment at 1250°C for 4 hours, and water cooled. The purpose is to eliminate the defects and alloy element segregation caused by the smelting process as much as possible, and also to obtain a uniform deformed structure.

[0048] (3) Large deformation rolling

[0049] After homogenizing the four...

Embodiment 3

[0054] The high entropy alloy of this embodiment is composed of the following atomic percentages: Fe 18%, Co 18%, Ni 18%, Mn 18%, Cr 18%, Al 5%, Cu 5%.

[0055] The preparation method of the above-mentioned ultrafine-grained high-entropy alloy, the specific operation steps are as follows:

[0056] (1) Alloy smelting: use 99.5% pure metal, mix ingredients according to the above ingredients, and then load into the furnace, vacuum smelting and vacuum auto-consumption (VAR), check before the furnace and adjust the ingredients to the requirements, then cast into ingots, the casting temperature is 1580°C .

[0057] (2) Homogenization heat treatment

[0058] Plate-like as-cast high-entropy alloy, sample size: 17 mm thick x 31 mm wide x 100 mm long, was subjected to homogenization heat treatment at 1180° C. for 6 hours, and then water-cooled. The purpose is to eliminate the defects and alloy element segregation caused by the smelting process as much as possible, and also to obtain a...

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Abstract

The invention belongs to the technical field of metal materials and machining and relates to a preparation method of an ultra-fine grain high-entropy alloy. Firstly, smelting is conducted, an FeCoCrNiMn series high-entropy alloy is compounded to be an intermediate alloy composed of pure metal with the purity being higher than 99.5% or alloy elements, a vacuum furnace is adopted for smelting, and the furnace casting temperature is 1550-1600 DEG C; then after cast ingots are subjected to homogenization heat treatment at the temperature of 1000-1350 DEG C, strong deformation asynchronous and synchronous mixed cold rolling treatment is conducted, continuous rolling is conducted through single-pass large percent reduction, the total rolling quantity is no smaller than 85%, and alloy structure nanocrystallization is achieved; and the rolled alloy is subjected to annealing treatment under the temperature of 450-800 DEG C, and the high-entropy alloy of an ultra-fine grain structure is obtained. Compared with the prior art, the preparation method is simple in technique, easy to achieve on a plate rolling production line, high in production efficiency and low in cost; and the size of the prepared ultra-fine grain high-entropy alloy is large, the comprehensive mechanical performance is excellent, and the preparation method can be applied to the fields of engineering machinery, aeronauticsand astronautics, military industry, electronics, instruments and the like.

Description

technical field [0001] The invention belongs to the technical field of metal materials and processing, and in particular relates to a preparation method of an ultrafine-grained high-entropy alloy. Background technique [0002] As a new alloy design idea, high-entropy alloys have attracted extensive attention from researchers at home and abroad. Most of the traditional alloy design ideas are based on one or two alloying elements, adding a small amount of other alloying elements to improve its structure and properties. The design idea of ​​high-entropy alloys breaks the traditional alloy design concept of using a single element as the main element, and uses equimolar or non-equiomolar ratios, multiple alloy elements as the matrix, and does not distinguish between solute and solvent atoms. In recent years, researchers have designed a variety of high-entropy alloy systems, which provides a broad space for the development and application of new alloys. High-entropy alloys have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16C22C30/02
CPCC22C1/02C22C30/00C22C30/02C22F1/16
Inventor 李紫勇付立铭单爱党
Owner SHANGHAI JIAO TONG UNIV
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