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Matrix-existing high-entropy alloy and preparation method thereof

A high-entropy alloy and alloy matrix technology, applied in the field of high-entropy alloys and their preparation, can solve the problems of poor mechanical properties of high-entropy alloys, poor intermetallic compound phases and plasticity, etc., achieve high-plastic comprehensive mechanical properties, and have broad application prospects , the effect of excellent comprehensive mechanical properties

Active Publication Date: 2018-10-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of poor mechanical properties of existing high-entropy alloys, high-entropy alloys containing large brittle intermetallic compound phases and poor plasticity, and to provide a base-based high-entropy alloy and its preparation method

Method used

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  • Matrix-existing high-entropy alloy and preparation method thereof
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  • Matrix-existing high-entropy alloy and preparation method thereof

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specific Embodiment approach 1

[0030] Specific Embodiment 1: In this embodiment, a base-based high-entropy alloy is prepared by mass percentage from 50% to 90% alloy matrix and 10% to 50% alloying elements; the alloy matrix is ​​Fe, Al, One or two elements of Cr, Ni, Co, Cu, Ti, Mn, Mo, Zr, Hf, Nb and Sn; the alloying elements are Fe, Al, Cr, Ni, Co, Cu , Ti, Mn, Mo, Zr, Hf, Nb and Sn, or two or more elements; when the alloy matrix is ​​two elements, the molar ratio between the two elements is b, b The value range is 0.5≤b≤2; the molar ratio between any two elements in the alloying elements is a, and a satisfies: 0.8≤a≤1.25.

specific Embodiment approach 2

[0031] Specific embodiment two: This embodiment is a preparation method of a base-based high-entropy alloy, which is completed according to the following steps:

[0032] 1. Prepare raw materials:

[0033] Weighing 50% to 90% of the alloy matrix and 10% to 50% of the alloying elements according to the mass percentage to obtain the raw material of the base-based high-entropy alloy;

[0034] The alloy matrix described in step 1 is one or two elements in Fe, Al, Cr, Ni, Co, Cu, Ti, Mn, Mo, Zr, Hf, Nb and Sn;

[0035] The alloying elements described in step 1 are two or more elements of Fe, Al, Cr, Ni, Co, Cu, Ti, Mn, Mo, Zr, Hf, Nb and Sn;

[0036] When the alloy matrix described in step 1 consists of two elements, the molar ratio between the two elements is b, and the range of b is 0.5≤b≤2;

[0037] The molar ratio between any two elements of the alloying elements described in step 1 is a, and the value range of a is 0.8≤a≤1.25.

[0038] 2. Melting the base-based high-entropy ...

specific Embodiment approach 3

[0046] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the arc melting method described in step two is completed according to the following steps:

[0047] 1. The raw materials of the base-based high-entropy alloy weighed in step 1 are successively added to the copper mold crucible in the non-consumable vacuum arc melting furnace according to the order of material melting point from low to high;

[0048] ②. Vacuumize the non-consumable vacuum arc melting furnace until the vacuum degree of the non-consumable vacuum arc melting furnace is lower than 1.0×10 -3 MPa, and then fill the non-consumable vacuum arc melting furnace with argon until the pressure in the non-consumable vacuum arc melting furnace is 0.05MPa;

[0049] ③. Repeat step ② for 3 to 5 times;

[0050] ④. Repeatedly smelting the base-based high-entropy alloy raw materials for 5 to 6 times at a melting current of 250A-400A, each melting time is 2min-5min, and cooling ...

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Abstract

The invention provides matrix-existing high-entropy alloy and a preparation method of the matrix-existing high-entropy alloy, and relates to the high-entropy alloy and the preparation method. The matrix-existing high-entropy alloy and the preparation method of the matrix-existing high-entropy alloy are designed to solve the problems that existing high-entropy alloy is poor in mechanical property,a large brittle intermetallic compound phase exists in the high-entropy alloy, and the plasticity is poor. The matrix-existing high-entropy alloy is formed by 50%-90% of alloy matrixes and 10%-50% ofalloying elements in a preparation mode according to the mass percentage. The method comprises the steps that firstly, raw materials are prepared; and secondly, the raw materials, weighed and taken inthe first step, of the matrix-existing high-entropy alloy are subjected to smelting by use of an electric arc smelting method or an induction smelting method, so that the matrix-existing high-entropyalloy is obtained. The yield strength of the prepared matrix-existing high-entropy alloy ranges from 1000MPa to 2000MPa, the breaking strength of the prepared matrix-existing high-entropy alloy ranges from 2000MPa to 4000MPa, the ultimate strain epsilon P (%) of the prepared matrix-existing high-entropy alloy ranges from 20% to 70%. The matrix-existing high-entropy alloy can be obtained.

Description

technical field [0001] The invention relates to a high-entropy alloy and a preparation method thereof. Background technique [0002] In the field of traditional alloy material design, one or two alloying elements are often used as the matrix, and a small amount of other elements are added as alloying elements to improve the mechanical properties of the matrix alloy such as hardness and strength, and improve the magnetic and electrical properties of the alloy material. And other physical properties, such as various steels, aluminum alloys, titanium alloys, nickel-based superalloy materials, and intermetallic compound materials such as Ti-Al and Ni-Al. [0003] In 2004, Taiwan scholar Ye Junwei jumped out of the traditional thinking pattern of alloy design and first proposed the design idea of ​​high-entropy alloys. High-entropy alloys are defined as: a new type of multi-principal alloy with the number of constituent elements n ≥ 5, each element having an equimolar ratio or n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/40C22C33/04C22B4/06
CPCC22B4/06C22C33/04C22C38/06C22C38/40
Inventor 李邦盛周扬晋玺张璐杜兴宇
Owner HARBIN INST OF TECH
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