Single-phase high-entropy alloy with micron/nano crystal grain composite structure

A high-entropy alloy and composite structure technology, applied in the field of single-phase high-entropy alloys, can solve problems such as difficulties, and achieve the effects of inhibiting grain growth, excellent wear resistance in a wide temperature range, and low cost of raw materials

Active Publication Date: 2022-04-08
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the first two types of design strategies, how to successfully construct nano / micro grain composite structures is the key to the third strategy, which is also extremely difficult.

Method used

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  • Single-phase high-entropy alloy with micron/nano crystal grain composite structure
  • Single-phase high-entropy alloy with micron/nano crystal grain composite structure
  • Single-phase high-entropy alloy with micron/nano crystal grain composite structure

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preparation example Construction

[0038] The preparation method of the single-phase high-entropy alloy with micron / nano grain composite structure comprises the following steps:

[0039] ⑴Convert Ni powder, Cr powder, Fe powder, Co powder, Al powder, Ti powder, Cu powder and B powder from the preset atomic ratio to mass ratio and weigh them into the planetary ball mill. mm tungsten carbide alloy balls are grinding balls, the ball-to-material ratio is 3.5~5.5:1, the rotation speed is 200~300 r / min, and the dry grinding fine crystallization is carried out under the condition that the protective gas is argon, and the running time is 24~ After 36 h, a dry fine-crystalline solid solution powder was obtained.

[0040] Among them: Ni powder, Cr powder, Fe powder, Co powder, Al powder, Ti powder and Cu powder are all spherical in shape, with a particle size of 20-53 μm and a purity of >99.9%. The particle size of powder B is 1~2μm, and the purity is >99.9%.

[0041] ⑵ Add 10% of the mass of absolute ethanol or ethyl ...

Embodiment 1

[0045] Example 1 Preparation of Ni 27 co 30 Cr 28 al 7 Cu 6 B 2 Single-phase high-entropy alloys:

[0046] (1) Dry grinding fine crystallization process: mix Ni powder, Co powder, Cr powder, Al powder, Cu powder and B powder according to the ratio shown in Table 1, weigh them with an electronic balance, and put them into a planetary ball mill to Tungsten carbide alloy balls with a diameter of 3-15 mm are used as grinding balls, the ball-to-material ratio is 3.5:1, and the rotation speed is 250 r / min. Dry grinding and fine-graining are carried out under the condition of argon as the protective gas, and the running time is 24 hours. , to obtain dry fine-crystalline solid solution powder.

[0047] Table 1: Alloy raw material ratio (mass ratio wt.%)

[0048]

[0049] (2) Wet grinding fine crystallization process: Add 10% of its mass absolute ethanol or ethyl acetate as a process control agent to the dry fine-grained solid solution powder, put it into the planetary ball m...

Embodiment 2

[0058] Example 2 Preparation of Ni 27 co 30 Cr 28 Al 7 Ti 6 B 2 Single-phase high-entropy alloys:

[0059] (1) Dry grinding fine crystallization process: mix Ni powder, Co powder, Cr powder, Al powder, Ti powder and B powder according to the ratio shown in Table 2, weigh them with an electronic balance and put them into a planetary ball mill to The tungsten carbide alloy balls with a diameter of 3-15 mm are used as grinding balls, the ball-to-material ratio is 4:1, and the rotation speed is 300 r / min. Dry grinding and fine-graining are carried out under the condition that the protective gas is argon, and the running time is 30 h, to obtain dry fine-crystalline solid solution powder.

[0060] Table 2: Alloy raw material ratio (mass ratio wt.%)

[0061]

[0062] (2) Wet grinding fine crystallization process: Add 10% of its mass absolute ethanol or ethyl acetate as a process control agent to the dry fine-grained solid solution powder, put it into the planetary ball mill...

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Abstract

The invention relates to a single-phase high-entropy alloy with a micron/nano crystal grain composite structure, the schematic chemical composition formula of the single-phase high-entropy alloy is M90-84H8-14X2, and the proportion of each element is calculated according to atomic percent; wherein M represents an FCC (Fluid Catalytic Cracking) matrix forming component and is any one of (NiCoCr), (NiCoFe) or (NiCoCrFe) with an approximately equal atomic ratio; h represents a heterostructure forming component and is any one of (AlTi) or (AlCu) with a near-equal atomic ratio; and X represents an element B. The material is simple in preparation process, low in raw material cost, excellent in comprehensive performance and high in reliability, and has important application prospects in the aspects of bearing and wear resistance of movement/transmission parts of advanced mechanical systems in the fields of automobiles, energy, aerospace and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of high-performance alloy materials, in particular to a single-phase high-entropy alloy with a composite structure of micron / nano grains. Background technique [0002] For centuries, the performance regulation of alloy systems has been based on the principle or guidance of alloying design between single principal elements and compound elements at dilute concentrations. However, in the past decade, the design strategy of alloys has gradually shifted from the narrow design space at the end of the phase diagram characterized by single principal composition to the broad design space at the center of the phase diagram characterized by multi-principal composition. [0003] Based on the multi-principal element alloying design strategy, a new class of complex alloys has been proposed and developed, especially as a subset or subclass of high-entropy alloys and medium-entropy alloys, which exhibit uniqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C30/02B22F9/04B22F3/14C22C1/04
Inventor 程军杨军耿钰山朱圣宇谈辉陈文元
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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