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High-entropy alloy and multi-component carbide eutectic composite material and in-situ preparation method

A technology for high-entropy alloys and composite materials, applied in the field of high-entropy alloys and multi-component carbide eutectic composite materials and their in-situ preparation, to achieve clean phase interfaces, reduce grain size, and good high temperature creep resistance performance effect

Active Publication Date: 2019-01-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the lack of comprehensive properties of the existing high-temperature-resistant high-entropy alloy at room temperature or high temperature and the deficiency of the solid-phase reaction method of the existing composite material, the present invention selects high-melting-point metal elements Mo, Nb, Re, and W on the basis of the high-temperature-resistant high-entropy alloy MoNbTaW , by adding high melting point TaC (including high melting point metal Ta), the high-entropy alloy and multi-component carbide eutectic composite material is formed in situ by arc melting method, and a high-temperature composite material with good room temperature strength and toughness is obtained

Method used

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  • High-entropy alloy and multi-component carbide eutectic composite material and in-situ preparation method
  • High-entropy alloy and multi-component carbide eutectic composite material and in-situ preparation method
  • High-entropy alloy and multi-component carbide eutectic composite material and in-situ preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of MoNbW(TaC) 0.5 composite material. The specific steps are as follows:

[0029] (1) Mixing: Weigh 2.5935g of Mo powder, 2.5116g of Nb powder, 4.9750g of W powder, and 2.6080g of TaC powder with a purity of 99.95% (Mo / Nb / W / TaC molar ratio is 1:1:1:0.5 ), the particle size of the powder is 20 μm; use a light ball mill for 15 hours to mix evenly to obtain a mixed powder.

[0030] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mold, and perform cold high-pressure molding (pressure 300 MPa) with a tablet press for 10 minutes to obtain a prefabricated block.

[0031] (3) Preparation of composite materials by electric arc melting: close the furnace door to vacuumize, and then pass 99.999% high-purity argon gas to make the pressure in the furnace relative to the standard atmospheric pressure reach -0.01MPa, start the arc quickly, and adjust the output power Melting to 40%-60% (current: 200-300A) for 2 minutes. After t...

Embodiment 2

[0034] Preparation of Re 0.5 MoNbW(TaC) 0.5 composite material. The specific steps are as follows:

[0035] (1) Weighing: Weigh 2.5140g of Re powder, 2.4638g of Mo powder, 2.6372g of Nb powder, 4.975g of W powder, and 2.6080g of TaC powder with a purity of 99.9% (Re / Mo / Nb / W / TaC molar ratio is 0.5:0.95:1.05:1:0.5). The particle size of the powder is 5 μm; it is mixed uniformly by using a light ball mill for 20 hours to obtain a mixed powder.

[0036] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mould, and perform cold high-pressure molding (pressure 250 MPa) with a tablet press for 8 minutes to obtain a prefabricated block.

[0037] (3) Preparation of composite materials by electric arc melting: close the furnace door to vacuumize, and then pass 99.999% high-purity argon gas to make the pressure in the furnace relative to the standard atmospheric pressure reach -0.01MPa, start the arc quickly, and adjust the output power Melting...

Embodiment 3

[0040] Preparation of Re 0.5 MoNbW(TaC) 0.9 composite material. The specific steps are as follows:

[0041] (1) Mixing: take by weighing 2.5140g of Re powder, 2.5935g of Mo powder, 2.5116g of Nb powder, 4.9750g of W powder, 4.6943g of TaC powder (Re / Mo / Nb / W / TaC molar ratio is 0.5:1:1:1:0.9), the particle size of Re powder, Nb powder and TaC powder is 44 μm, and the particle size of other powders is 0.5 μm; use a light ball mill to mix evenly for 25 hours to obtain a mixed powder.

[0042] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mould, and perform cold high-pressure molding (pressure 300 MPa) with a tablet press for 6 minutes to obtain a prefabricated block.

[0043] (3) Preparation of composite materials by electric arc melting: close the furnace door to vacuumize, and then pass 99.999% high-purity argon gas to make the pressure in the furnace relative to the standard atmospheric pressure reach -0.01MPa, start the arc quickl...

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Abstract

The invention provides a high-entropy alloy and multi-component carbide eutectic composite material and an in-situ preparation method. A vacuum arc melting is adopted, powder of pure Re, Mo, Nb, and Wand TaC powder are subjected to high temperature melting, and in-situ generated high-entropy alloy phase and a multi-component carbide phase form the eutectic composite material. The composite material is composed of primary dendritic crystals and fine, regular, and layered eutectic tissues; the phase interface is clean, the binding force is high; the toughness is high at a room temperature; theyield strength is greater than 1.1 GPa; the average extreme compression strength is greater than 1.8 GPa; the plastic strain is more than 5% at a room temperature; the hardness is more than 5.8 GPa; and the composite material can be applied to fields such as nuclear power industry, national defense and military industry, and the like.

Description

technical field [0001] The invention relates to a high-entropy alloy and multi-element carbide eutectic composite material and an in-situ preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] With the continuous development of nuclear power technology, national defense and military industry and other fields, higher and higher requirements are put forward for high-temperature structural materials. For example, the operating temperature of the skin of aerospace vehicles is above 1000 °C, and the operating temperature of jet engines is as high as nearly 2000 °C. , High-temperature thermocouple elements use temperatures as high as 2300 ° C, etc., all require materials with higher use temperatures or higher high-temperature strength. High-temperature-resistant high-entropy alloy materials have a series of excellent properties, such as high strength, high hardness, and good high-temperature creep resistance under the com...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C32/00C22C1/10C22C1/02
CPCC22C1/1036C22C30/00C22C32/0052C22C1/1047
Inventor 沈强魏琴琴罗国强刘茹霞张建王传彬张联盟
Owner WUHAN UNIV OF TECH
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