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A kind of high-entropy alloy containing eutectic structure and preparation method thereof

A high-entropy alloy and eutectic structure technology, which is applied to the above-mentioned high-entropy alloy preparation field, can solve the problems of low high-temperature strength and poor room temperature toughness of NiAl alloy, and achieves uniform structure and composition of the alloy, good casting fluidity, and fine structure. Effect

Active Publication Date: 2022-03-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-entropy alloy containing eutectic structure, which solves the problems of poor room temperature toughness and low high-temperature strength of NiAl alloys existing in the prior art

Method used

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  • A kind of high-entropy alloy containing eutectic structure and preparation method thereof
  • A kind of high-entropy alloy containing eutectic structure and preparation method thereof
  • A kind of high-entropy alloy containing eutectic structure and preparation method thereof

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Effect test

Embodiment 1

[0038] A method for preparing a high-entropy alloy containing eutectic structure, specifically implemented according to the following steps:

[0039] Step 1, according to the atomic ratio of (NiAl-Mo7.5Cr7.5V7.5, respectively weigh Ni block, Al block, Cr sheet, Mo wire and V block, the purity of Ni block is 99.96%, the purity of Al block is 99.99%, Cr The purity of sheet is 99.90%, the purity of moss is 99.95%, and the purity of V block is 99.90%;

[0040] Step 2. Pretreat the surface of Ni block, Al block, and Mo wire by pickling, specifically, use HF, HNO3 and water with a volume ratio of 1:1:2.0 to clean the Ni block for 10 minutes, and use volume Wash the Al block with HCl and water at a ratio of 1:1.5 for 10 minutes, and clean the Mo wire with HNO3 and water at a volume ratio of 1:1.5 for 5 min. After cleaning, place the Ni block, Al block, and Mo wire separately. Put them into different containers, add alcohol to soak for 5 minutes, remove impurities and acid attached t...

Embodiment 2

[0047] A method for preparing a high-entropy alloy containing eutectic structure, specifically implemented according to the following steps:

[0048] Step 1. According to the atomic ratio of NiAl-Mo8.33Cr8.33V8.33, respectively weigh Ni block, Al block, Cr sheet, Mo wire and V block, the purity of Ni block is 99.96%, the purity of Al block is 99.99%, and the Cr sheet The purity is 99.90%, the purity of moss is 99.95%, and the purity of V block is 99.90%;

[0049] Step 2. Pretreat the surface of Ni block, Al block, and Mo wire by pickling, specifically, use HF, HNO3 and water with a volume ratio of 1:1:2.5 to clean the Ni block for 15 minutes, and use volume The HCl and water with a ratio of 1:1.75 were used to clean the Al blocks for 15 minutes, and the Mo wires were cleaned with HNO3 and water with a volume ratio of 1:1.75 for 7.5 min. After cleaning, the Ni blocks, Al blocks, and Mo wires were cleaned separately Put them into different containers, add alcohol to soak for 7....

Embodiment 3

[0056] A method for preparing a high-entropy alloy containing eutectic structure, specifically implemented according to the following steps:

[0057] Step 1. According to the atomic ratio of NiAl-Mo8.7Cr8.7V8.7, respectively weigh Ni block, Al block, Cr sheet, Mo wire and V block, the purity of Ni block is 99.96%, the purity of Al block is 99.99%, and the Cr sheet The purity is 99.90%, the purity of moss is 99.95%, and the purity of V block is 99.90%;

[0058] Step 2. Pretreat the surface of Ni block, Al block, and Mo wire by pickling, specifically, use HF, HNO3 and water with a volume ratio of 1:1:2.5 to clean the Ni block for 15 minutes, and use volume The HCl and water with a ratio of 1:1.75 were used to clean the Al blocks for 15 minutes, and the Mo wires were cleaned with HNO3 and water with a volume ratio of 1:1.75 for 7.5 min. After cleaning, the Ni blocks, Al blocks, and Mo wires were cleaned separately Put them into different containers, add alcohol to soak for 7.5 m...

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Abstract

The invention discloses a high-entropy alloy containing eutectic structure (NiAl)100-3xMoxCrxVx according to the atomic percentage, 7.5≤x≤10, wherein Ni and Al are in an equiatomic ratio; the invention also discloses the eutectic The preparation method of the high-entropy alloy with the microstructure specifically comprises: first weighing the raw material according to the atomic ratio, then pickling the raw material, and finally smelting in a melting furnace to obtain the high-entropy alloy with the eutectic structure. The high-entropy alloy prepared by the method of the invention has excellent strength and toughness.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloy materials, and relates to a high-entropy alloy containing eutectic structure, and also relates to a preparation method of the above-mentioned high-entropy alloy. Background technique [0002] For the currently studied NiAl alloys, because of its high melting point, low density, good thermal conductivity and excellent oxidation resistance, it has broad application prospects in the aerospace field, but its poor room temperature toughness and low high temperature strength limit its application. In order to improve its performance, a large number of elements (such as Mo, Cr, V, etc. are introduced into the metal phase) are usually added to form a NiAl-based eutectic alloy, and its fracture toughness can be significantly improved, but its high-temperature strength is low. After adding Ta and Nb to NiAl to introduce Laves phase, the high temperature strength can be obviously improved, but the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C19/007C22C19/057C22C1/023
Inventor 王雷张国君张云鹏姚成利苏艳宁黄远东
Owner XIAN UNIV OF TECH
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