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High-strength face-centered cubic structure medium-entropy alloy and preparation method thereof

A technology of face-centered cubic and entropy alloy, applied in the field of entropy alloy and its preparation in high-strength face-centered cubic structure

Active Publication Date: 2018-11-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with high-entropy alloys, medium-entropy alloys are more valuable for production and use. At present, the research on medium-entropy alloys is still in its infancy, and there are few reports on medium-entropy alloys.

Method used

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  • High-strength face-centered cubic structure medium-entropy alloy and preparation method thereof
  • High-strength face-centered cubic structure medium-entropy alloy and preparation method thereof
  • High-strength face-centered cubic structure medium-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A high-strength face-centered cubic medium-entropy alloy, the alloy composition: Co: 30%, Ni: 30%, Cu: 40%, and its preparation method comprises the following steps:

[0043] Weigh 5.62g of Co ingot, 6.29g of Ni ingot, and 8.08g of Cu ingot, and mix the granular / block raw materials Co, Cu, and Ni with a purity greater than 99.99% in proportion.

[0044] 2) Put the ingredients into the vacuum melting furnace and vacuumize to 1×10 -3 Pa, then fill with argon until the pressure in the furnace reaches 0.05MPa, melting current: 200A, turn over and repeat melting for more than 5 times.

[0045] 3) Suction cast the ingot, after cooling, take out the cast rod, put it into the muffle furnace for homogenization annealing treatment, raise the temperature to 1000°C at a rate of 5°C / min, then open the furnace door, and quickly place the cast rod Put it into the furnace, wait for the temperature of the furnace to return to 1000°C, and keep it for 1 hour.

[0046] 3. Put the medium ...

Embodiment 2

[0048]A high-strength face-centered cubic medium-entropy alloy, the alloy composition: Co: 32%, Ni: 32%, Cu: 36%, and its preparation method comprises the following steps:

[0049] Weigh 5.99g of Co ingots, 6.72g of Ni ingots, and 7.27g of Cu ingots, and mix the granular / blocky raw materials Co, Cu, and Ni with a purity greater than 99.99% in proportion.

[0050] 2) Put the ingredients into the vacuum melting furnace and vacuumize to 1×10 -3 Pa, then fill with argon until the pressure in the furnace reaches 0.05MPa, melting current: 200A, turn over and repeat melting for more than 5 times.

[0051] 3) Suction-cast the ingot, after cooling, take out the cast rod, put it into the muffle furnace for homogenization annealing treatment, raise the temperature to 1000°C at a rate of 5°C / min, then open the furnace door, and quickly put the cast rod Put it into the furnace, wait for the temperature of the furnace to return to 1000°C, and keep it for 1 hour.

[0052] 3. Put the medium...

Embodiment 3

[0054] A high-strength face-centered cubic medium-entropy alloy, the alloy composition: Co: 33.3%, Cu: 33.3%, Ni: 33.3%, and its preparation method comprises the following steps:

[0055] Weigh 6.5g of Co ingots, 7.01g of Cu ingots, and 6.47g of Ni ingots, and mix the granular / blocky raw materials Co, Cu, and Ni with a purity greater than 99.99% in proportion.

[0056] 2) Put the ingredients into the vacuum melting furnace and vacuumize to 1×10 -3 Pa, then fill with argon until the pressure in the furnace reaches 0.05MPa, melting current: 200A, turn over and repeat melting for more than 5 times.

[0057] 3) Suction-cast the ingot, after cooling, take out the cast rod, put it into the muffle furnace for homogenization annealing treatment, raise the temperature to 1000°C at a rate of 5°C / min, then open the furnace door, and quickly put the cast rod Put it into the furnace, wait for the temperature of the furnace to return to 1000°C, and keep it for 1 hour.

[0058] 3. Put the ...

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Abstract

The invention discloses a high-strength face-centered cubic structure medium-entropy alloy and a preparation method thereof. The CoNiCu medium-entropy alloy comprises Co, Ni and Cu elements; a resultof respective comparison of different medium-entropy alloys in electron concentration and mixing enthalpy according to the Gibbs free energy and the phase formation law of the alloy shows that the CoNiCu medium-entropy alloy has the tendency to form a single-phase FCC structure, a CoNiCu medium-entropy alloy model is constructed based on the tendency, and the alloy is predicted to be a ductile material by a first-principles technique. The preparation method of the alloy comprises the following steps: batching, vacuum melting, suction casting, homogenization annealing and solid solution treatment. Co, Cr, and Cu with a purity of 99% or more are selected and are proportioned according to an equimolar ratio or an approximately equimolar ratio, the proportioned raw materials are placed in a vacuum smelting furnace and are multiply smelted, suction casting molding is carried out after the components are uniform, and the obtained casting undergoes homogenization annealing and solid solutiontreatment to obtain the CoNiCu medium-entropy alloy having a single face-centered cubic structure and having a room temperature compressive strength of above 1600 MPa and a compression ratio of above20%.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a high-strength face-centered cubic medium-entropy alloy and a preparation method thereof. Background technique [0002] According to the mixing entropy, the existing alloys can be divided into three categories. The first category is low-entropy alloys with one or two elements as the main constituent elements, that is, traditional alloys (ΔS mix <1R); the second type is a medium entropy alloy with two to four main elements (1R≤S mix ≤1.5R); the third category is a high-entropy alloy (S mix ≥1.5R). [0003] The excellent performance of high-entropy alloys in terms of performance makes them one of the most researched metallic materials. The high-entropy effect of high-entropy alloys promotes the formation of single-phase solid solutions. At the same time, due to the significant solid-solution strengthening effect, the strength and plasticity of the solid-solution phases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/02B22D18/06C22F1/02
CPCB22D18/06C22C1/02C22C30/02C22F1/02
Inventor 储成林安旭龙戴挺
Owner SOUTHEAST UNIV
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