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Medium-high-entropy alloy material and preparation method and application thereof

A high-entropy alloy, high-temperature material technology, applied in the field of materials, to achieve the effects of high hardness and wear resistance, low accuracy requirements, and good mechanical properties

Active Publication Date: 2020-06-19
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the object of the present invention is to overcome the defects of current high-temperature medium-high-entropy alloys, and provide a medium-high-entropy alloy that can withstand high-temperature oxidation and its preparation method and application

Method used

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  • Medium-high-entropy alloy material and preparation method and application thereof
  • Medium-high-entropy alloy material and preparation method and application thereof
  • Medium-high-entropy alloy material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] This example is used to illustrate the preparation method of MoTaTi alloy.

[0078] Preparation of MoTaTi alloy. Use an electronic balance to accurately weigh Mo, Ta, and Ti metal powders with a purity of 99.9%, the total mass is 6 grams, and the molar ratio is 1:1:1. Pour the three metal powders weighed into the same small beaker, Stir with a thin metal rod for 10 minutes (other methods can also be used to stir well), so that it is basically mixed. Pour the mixed powder into a tableting mold, and then use a tablet machine to compress the powder with a pressure of 300 MPa, and release the pressure after holding the pressure for about 2 minutes. The pressed raw material is taken out from the tableting mold. At this time, the powder raw material becomes a cylindrical block with a certain strength and will not be easily broken or scattered. Repeat the above tabletting steps until all powder raw materials are compressed into blocks. Put the finished powder block into an ...

Embodiment 2-3

[0085] This example is used to illustrate the preparation method of MoTaTi alloy.

[0086] Prepare refractory middle entropy alloy Mo according to the method of embodiment 1 35 Ta 35 Ti 30 and Mo 30 Ta 30 Ti 40 , the difference is only in the adjustment of the ratio of raw materials. Its lattice structure, alloy structure, microhardness and high temperature oxidation behavior are shown in Table 1.

Embodiment 4

[0088] This example is used to illustrate the preparation method of MoTaTiCr alloy.

[0089] Use an electronic balance to accurately weigh Mo, Ta, Ti, Cr metal powders with a purity of 99.9%. The total mass is 6 grams, and the molar ratio is 1:1:1:1. In a small beaker, stir with a thin metal rod for 10 minutes (other methods can also be used to stir evenly), so that it is basically mixed evenly. Pour the mixed powder into a tableting mold, and then use a tablet machine to compress the powder with a pressure of 300 MPa, and release the pressure after holding the pressure for about 2 minutes. The compressed raw material is taken out from the tableting die, and the powder raw material becomes a cylindrical block at this time. Repeat the above tabletting steps until all the powder raw materials are compressed into blocks. Put the finished powder block into an electric arc furnace with titanium adsorption and argon atmosphere, and melt it with a current of 260 amps, smelting 4 to...

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Abstract

The invention provides a medium-high-entropy alloy material. The medium-high-entropy alloy material is a solid solution alloy of a single-phase body-centered cubic structure, and the medium-high-entropy alloy material at least comprises Mo, Ta and Ti elements. The invention further provides a preparation method and an application of the medium-high-entropy alloy material. The refractory medium-high-entropy alloy has good thermal stability, good high-temperature oxidation resistance, relatively high hardness and wear resistance and good solid solution capability. According to the medium-high-entropy alloy material, the innovative preparation method of powder briquetting and arc melting is adopted, the difficult problem that the melting point difference between the alloy components is too large, the normal arc melting is difficult to melt the bulk raw materials uniformly is solved, and a simple and feasible preparation method for the alloy material with large melting point difference isprovided.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a medium-high entropy alloy material, its preparation method and application. Background technique [0002] Superalloys are a class of metal materials that work for a long time in a high temperature environment (at least 600°C or higher). Superalloys need to have excellent high temperature strength, oxidation resistance and hot corrosion resistance, etc., and have important applications in aerospace and energy fields. [0003] Nickel-based superalloys are widely used in the aerospace field, and about 40% of the superalloys are nickel-based superalloys. The main components of nickel-based superalloys are Ni, Co, Cr, W, Mo, Re, Ru, Al, Ta, Ti and other elements, the matrix is ​​nickel element, the content is more than 60%, and the main working temperature range is 950°C-1100°C , when served in this temperature range, it has high strength, strong oxidation resistance and corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 李力超柳延辉李明星王超
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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