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High-entropy alloy and preparation method thereof

A high-entropy alloy and uniform mixing technology, applied in the field of high-entropy alloys, can solve the problems of difficult to control the structure and properties of high-entropy alloy materials, difficult to exert the mechanical advantages of high-entropy alloys, and thin film thickness of high-entropy alloys. The effect of electrochemical corrosion, good passivation, excellent corrosion resistance

Inactive Publication Date: 2014-10-15
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The high-entropy alloy prepared by the vacuum electric arc furnace casting method belongs to the as-cast product. Usually, the high-entropy alloy in the as-cast state has natural performance defects, such as voids and porosity caused by thermal expansion and contraction, and the process of this method is relatively Complex, the microstructure and properties of the obtained high-entropy alloy materials are difficult to control
The thickness of the high-entropy alloy film prepared by magnetron sputtering is relatively thin, it is difficult to take advantage of the mechanical properties of high-entropy alloy, and there are certain requirements for the substrate material

Method used

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  • High-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Take aluminum, chromium, iron, nickel, copper, and molybdenum powders in equimolar ratios, mix them with a ball mill for 24 hours, put them into an abrasive tool, and press the sample with a hydraulic universal testing machine at a pressure of 120kN for 5 minutes. The pressed sample was sintered in a vacuum sintering furnace under the protection of argon at a heating rate of 10°C / min, kept at 600°C for 2 hours, and finally heated to 1800°C, then cooled with the furnace.

[0039] The potentiodynamic polarization curve of the alloy in 3.5% NaCl solution was tested by an electrochemical workstation at room temperature. A three-electrode system was used: the reference electrode was a saturated calomel electrode, the auxiliary electrode was a platinum electrode, and the working electrode was a high-entropy alloy. A cylindrical sample with a diameter of 10mm is used, and the surface to be tested is reserved, and the rest is covered with epoxy resin, polished with sandpaper, ul...

Embodiment 2

[0042] Take aluminum, chromium, iron, nickel, copper, and molybdenum powders in an equimolar ratio, mix them with a ball mill for 24 hours, put them into an abrasive tool, use graphite as a release agent, and press them with a pressure of 120kN on a hydraulic universal testing machine Samples were kept under pressure for 5 minutes. The pressed sample was sintered in a vacuum sintering furnace under the protection of argon at a heating rate of 10°C / min, kept at 600°C for 2 hours, and finally heated to 1800°C, then cooled with the furnace.

[0043] Use X-ray diffractometer to analyze alloy phase composition, the conditions are: Cu target, voltage 40kV, current 40mA, scanning angle 30°~95°, scanning speed 4(°) / min, the results are as follows figure 1 shown.

[0044] Use a micro / Vickers hardness tester to test the hardness of the alloy. During the experiment, load 20g, hold the pressure for 10s, measure 7 sets of data, and take the average value. The hardness of the alloy is 506H...

Embodiment 3

[0047] Take aluminum, chromium, iron, nickel, copper, and molybdenum powders at a molar ratio of 1.1:1.05:1:1:1:1.05, mix the powders with a ball mill for 24 hours, put them into abrasive tools, and use a hydraulic universal testing machine at 120kN Press the sample under pressure and keep the pressure for 5 minutes. The pressed sample was sintered in a vacuum sintering furnace under the protection of argon at a heating rate of 10°C / min, kept at 580°C for 2 hours, and finally heated to 1800°C, then cooled with the furnace.

[0048] The corrosion kinetic parameters are: self-corrosion potential E corr =0.153V, self-corrosion current density I corr =4.24×10 -8 A / cm 2 , the result is as figure 2 shown. The hardness of the alloy is 502HV. The compressive strength of the alloy is 1410MPa.

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Abstract

The invention discloses high-entropy alloy. The high-entropy alloy is formed by aluminum, chromium, iron, nickel, copper and molybdenum and the mole ratio of the above is 1 to 1.1 to 1 to 1.05 to 1 to 1.05 to 1 to 1.05 to 1 to 1.05 to 1 to 1.05. The high quality as-cast high-entropy alloy is obtained by compression molding of powder material and vacuum sintering. The high-entropy alloy is good in hardness, high in compression strength, prominent in corrosion resistance and can satisfy some environment with specific requirements.

Description

technical field [0001] The invention relates to a high-entropy alloy, in particular to an alloy in which the weight of each component is less than 50%, and also relates to a preparation method of the high-entropy alloy. Background technique [0002] High-entropy alloys are alloys containing a variety of main elements, and the number of alloying elements n≥5. The reason why such alloys are called "high-entropy alloys" is because the alloy has a high entropy value. For example, the traditional binary alloy is dominated by one element, and its mixing entropy is less than 0.69R (R is a gas universal constant, its value is 8.31J / mol K), and when the number of components is five, six, seven And when the molar ratio is equal, the mixing entropy of the alloy is 1.61R, 1.79R and 1.95R, respectively. If the positive contributions of atomic vibrational configuration, electronic configuration, magnetic moment configuration, etc. are considered, the entropy value of the system will be ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C1/04
Inventor 邱星武刘春阁郏义征胡楠楠张云鹏
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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