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AlCoCrFeNiTix high-entropy alloy material and method for preparing same

A high-entropy alloy and alloy technology, applied in the field of AlCoCrFeNiTix high-entropy alloy and its preparation, to achieve the effects of high hardness, improved stability, and high yield strength

Inactive Publication Date: 2012-11-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although people have developed new material processing techniques, such as rapid solidification, laser processing, etc., to improve the performance of materials, they still cannot meet the requirements.

Method used

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  • AlCoCrFeNiTix high-entropy alloy material and method for preparing same
  • AlCoCrFeNiTix high-entropy alloy material and method for preparing same
  • AlCoCrFeNiTix high-entropy alloy material and method for preparing same

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Embodiment Construction

[0020] figure 1 A flowchart illustrating the steps of the present invention is illustrated.

[0021] 1. The preparation of multi-principal high-entropy alloys is a key step, and the preparation process has the following steps in sequence:

[0022] 1) Raw material preparation: the alloy smelting raw materials adopted in the present invention are high-purity (≥99.9%) Al, Co, Cr, Fe, Ni and Ti elements, which are accurately weighed and proportioned according to the molar ratio, and used for smelting and preparing alloys . The alloy composition is shown in Table 1.

[0023] Nominal composition (at%) of AlCoCrFeNiTix (x=0, 0.1, 0.2, 0.3, 0.4 and 0.5) high-entropy alloys (HEAs) with different Ti contents

[0024]

[0025] Table 1

[0026] 2) Purification of pure metals: the alloy preparation uses high-purity (99.9%) Al, Co, Cr, Fe, Ni, Ti as raw materials, and uses boric anhydride to purify high-purity metal surface oxides. Put into the test tube, then put the pure metal to ...

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Abstract

The invention relates to a high-entropy alloy material and a method for preparing the same. The component of the high-entropy alloy material is AlCoCrFeNiTix, wherein x represents a molar ratio, and the value range is between 0.1-0.4. The method for preparing the material comprises: preparing raw materials, adopting the alloy smelting raw materials including Al, Co, Cr, Fe, Ni and Ti, and accurately weighing and proportioning according to the molar ratio; then, purifying oxide on a metal surface; putting the prepared raw materials into a tank in a water-cooling copper-formed mold smelting pool, vacuumizing, filling argon, controlling smelting current to be at about 250 ampere and smelting time for 30-60 seconds, turning an alloy block after alloys are fully mixed, putting an alloy ingot into a tank of a water-cooling copper-formed mold, regulating the smelting current, opening a suction casting air suction valve after the alloys are uniformly smelted, utilizing the negative pressure in a pump for suction casting, and taking out the alloy ingot after an alloy mould is cooled. Compared with the conventional crystalline state alloy, the high-entropy alloy material has relative high thermal stability, hardness, yield strength, breaking tenacity, plastic deformation and work hardening capacity.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, in particular to AlCoCrFeNiTix (x is the molar ratio, x=0, 0.1, 0.2, 0.3, 0.4 and 0.5) high-entropy alloy and its preparation method. Background technique [0002] For a long time, the traditional alloy design method is to use one or two elements as the main components, and then add other elements to improve the structure and properties of the alloy, such as stainless steel, aluminum alloy, Ti-Al and other binary intermetallic compounds. and bulk amorphous alloys [1] . The current theories about crystal phases are limited to these alloys. Too many components in the alloy lead to the formation of multiple intermetallic compounds or other complex organizational structures, making it difficult to analyze and subsequently process [2] . With the development of modern industry, people put forward higher and higher requirements for materials in terms of operating temperature, str...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/00
Inventor 乔珺威杨慧君石巨岩王银凤
Owner TAIYUAN UNIV OF TECH
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