Eutectic system high-entropy alloy and preparation method thereof

A technology of high-entropy alloys and crystal systems, applied in the preparation of the above-mentioned eutectic high-entropy alloys, and in the field of eutectic high-entropy alloys, can solve the problem that NiAl intermetallic compounds cannot have high toughness and strength at the same time, and achieve microstructure The effect of uniform composition, simple and stable process, high strength and toughness

Active Publication Date: 2021-10-08
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of eutectic high-entropy alloy, which solves the problem that the NiAl intermetallic compound existing in the prior art cannot have high toughness and strength at the same time

Method used

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  • Eutectic system high-entropy alloy and preparation method thereof
  • Eutectic system high-entropy alloy and preparation method thereof
  • Eutectic system high-entropy alloy and preparation method thereof

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preparation example Construction

[0031] A kind of preparation method of eutectic high-entropy alloy of the present invention, specifically implement according to the following steps:

[0032] Step 1, according to NiAl-(Mo x Cr x Fe x ) 3x , 13.3≤x≤16 Atomic percentage weighs Ni block, Al rod, Cr sheet, Mo wire and Fe rod respectively, where Ni and Al are equal atomic ratio, and calculate the compensation amount of Al, the purity of Ni block is 99.9~99.96 wt%, the purity of Al rods is 99.9-99.99wt%, the purity of Cr flakes is 99.9-99.95wt%, the purity of Mo wire is 99.9-99.95wt%, the purity of Fe rods is 99.9-99.95wt%; the mass compensation of Al 0.5~2wt%;

[0033] Step 2. Perform descaling pretreatment on the surface of the Ni block, Al rod, Mo wire and Fe rod weighed in step 1. Specifically, measure HCl and water with a volume ratio of 1:1 to 1.5 as a cleaning solution, Pour the cleaning solution into the ultrasonic instrument, and at the same time place the Al rod and Fe rod in the cleaning solution fo...

Embodiment 1

[0040] A method for preparing a eutectic high-entropy alloy, specifically implemented according to the following steps:

[0041] Step 1. According to NiAl-Mo 13.3 Cr 13.3 Fe 13.3 The atomic percentage of (at%) weighs Ni block, Al rod, Cr sheet, Mo silk and Fe rod respectively, wherein Ni, Al are equiatomic ratio, and calculate the compensation amount of Al, the purity of Ni block is 99.9wt%, Al The purity of rods is 99.95wt%, the purity of Cr flakes is 99.9%, the purity of Mo wire is 99.9wt%, the purity of Fe rods is 99.9wt%; the mass compensation of Al is 0.5wt%;

[0042] Step 2. Carry out descaling pretreatment on the surface of the Ni block, Al rod, Mo wire and Fe rod weighed in step 1, specifically, measure HCl and water with a volume ratio of 1:1 as a cleaning solution, and use the Pour the cleaning solution into the ultrasonic instrument, and at the same time put the Al rod and Fe rod in the cleaning solution for cleaning for 10 minutes; measure HCl, HNO3 and water wi...

Embodiment 2

[0050] A kind of preparation method of eutectic high-entropy alloy of the present invention, specifically implement according to the following steps:

[0051] Step 1. According to NiAl-Mo 14.0 Cr 14.0 Fe 14.0 The atomic percentage of (at%) weighs Ni block, Al rod, Cr sheet, Mo silk and Fe rod respectively, wherein Ni, Al are equal atomic ratio, and calculate the compensation amount of Al, the purity of Ni block is 99.95wt%, Al The purity of rods is 99.9wt%, the purity of Cr flakes is 99.95wt%, the purity of Mo wire is 99.95wt%, the purity of Fe rods is 99.95wt%; the mass compensation of Al is 1wt%;

[0052] Step 2. Carry out descaling pretreatment on the surface of the Ni block, Al rod, Mo wire and Fe rod weighed in step 1, specifically, measure HCl and water with a volume ratio of 1:1.25 as a cleaning solution, and use the Pour the cleaning solution into the ultrasonic instrument, and at the same time place the Al rod and Fe rod in the cleaning solution for cleaning for 10...

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Abstract

The invention discloses eutectic system high-entropy alloy, which is NiAl-(MoxCrxFex)3x according to the atomic percent; x is larger than or equal to 13.3 and smaller than or equal to 16, where Ni and Al are in an equal atomic ratio. The invention further discloses a preparation method of the eutectic system high-entropy alloy; specifically, raw materials are weighed according to the atomic ratio; the surfaces of the raw materials are subjected to descaling pretreatment; the raw materials are placed in an electric arc smelting furnace to be smelted; and the eutectic system high-entropy alloy is obtained. The eutectic system high-entropy alloy disclosed by the invention has relatively high strength and better plasticity at the same time; and the mechanical property is obviously better.

Description

technical field [0001] The invention belongs to the technical field of eutectic high-entropy alloys, and relates to a eutectic high-entropy alloy, and also relates to a preparation method of the above-mentioned eutectic high-entropy alloy. Background technique [0002] Intermetallic compounds are one of the research hotspots of high-temperature structural materials in recent years, such as NiAl, Ni3Al, TiAl, FeAl, etc., especially NiAl has the advantages of high melting point, low density, high thermal conductivity, and excellent oxidation resistance, which can be used as an ideal high-temperature structural material. One of the structural materials, but its room temperature brittleness and low strength limit its further application. [0003] In the past, trace elements such as Fe, Mo, Ga, Hf, etc. were added to NiAl, but it was difficult to improve its brittleness or strength. More often, a certain amount of single elements such as Mo, Cr, Fe, etc. were added to NiAl to for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02
Inventor 王雷张国君张云鹏姚成利武新塬
Owner XIAN UNIV OF TECH
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