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W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and preparation method thereof

A w-ta-mo-nb-zr, high-entropy alloy technology, applied in the field of W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and its preparation, can solve the shortage of high-temperature high-entropy alloy system, and the strength needs to be further improved Improvement, room temperature plasticity is not high, etc., to achieve the effect of improved impact resistance, improved compressive strength, and simple preparation steps

Active Publication Date: 2020-06-05
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NbMoTaW high-temperature high-entropy alloy has a single-phase body-centered cubic (BCC) structure, the maximum compressive strength at room temperature is 1211MPa, the plasticity is 2.1%, the brittleness is large, the plasticity is not good, and the strength needs to be improved
[0004] However, the room temperature plasticity of high-temperature high-entropy alloys currently studied is not high, and the brittleness is large, and the strength needs to be further improved.
Domestic research on high-temperature high-entropy alloys is less, and there are insufficient high-temperature high-entropy alloy systems to choose from, which limits the choice of high-temperature structural materials in my country

Method used

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  • W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and preparation method thereof
  • W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and preparation method thereof
  • W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation of embodiment 1WTaMoNbZr high-temperature high-entropy alloy

[0042] The raw materials used are W elemental powder, Ta elemental powder, Mo elemental particles, Nb elemental particles, and Zr elemental particles, and are prepared in an equiatomic ratio. Put the above raw materials into the water-cooled copper crucible of the non-consumable vacuum arc melting furnace, and then carry out vacuum arc melting: vacuumize the vacuum chamber to 5×10 -3 Pa, refill high-purity argon with a purity of 99.999% until the pressure of the vacuum chamber is -0.7MPa, high-purity argon is used as the protective gas and arcing medium, the melting current is 450A, and cooling water is passed during melting to prevent the water-cooled copper plate from overheating and melting , the front and back sides were repeatedly smelted 5 times, each smelting time was 4 minutes, and the alloy was in liquid state for 20 minutes. After cooling, a WTaMoNbZr high-temperature high-entropy a...

Embodiment 2

[0043] Performance test and structural characterization of embodiment 2 WTaMoNbZr high-temperature high-entropy alloy ingot

[0044] 1. Density determination:

[0045] The Archimedes drainage method is used for measurement, and the specific operation steps are as follows: the WTaMoNbZr high-temperature high-entropy alloy prepared in Example 1 is prepared into three cylindrical samples of Φ4mm×4mm, and put into a beaker filled with absolute alcohol before measurement , ultrasonically oscillate and clean for 10 minutes, take it out and blow dry, and then use a DT-100 precision balance (accuracy 0.1mg) to weigh the dry weight of each sample M 1 , weigh each sample 3 times to reduce the measurement error; then, weigh the mass M of each sample in water 2 , each sample was weighed 3 times; finally, the density was calculated according to the following formula,

[0046]

[0047] In the formula, ρ 0 is the density of water, 0.9982g / cm 3 (20°C); ρ l is air density, 0.0012g / cm ...

Embodiment 3

[0061] Example 3W 20 Ta 20 Mo 21 Nb 19 Zr 20 Preparation, performance testing and structural characterization of high-temperature high-entropy alloys

[0062] The raw materials used are W elemental powder, Ta elemental powder, Mo elemental particles, Nb elemental particles, and Zr elemental particles according to W:Ta:Mo:Nb:Zr=20:20:21:19:20. Put the above raw materials into the water-cooled copper crucible of the non-consumable vacuum arc melting furnace, and then carry out vacuum arc melting: vacuumize the vacuum chamber to 5×10 -3 Pa, refill high-purity argon with a purity of 99.999% until the pressure of the vacuum chamber is -0.7MPa, high-purity argon is used as a shielding gas and arcing medium, the melting current is 380A, and cooling water is passed during melting to prevent the water-cooled copper plate from overheating and melting , the front and back sides are repeatedly smelted 4 times, each smelting is 4 minutes, the alloy is in the liquid state for 16 minute...

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Abstract

The invention provides a W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and a preparation method thereof. The high-temperature high-entropy alloy is composed of W, Ta, Mo, Nb and Zr according to anequal or an unequal atomic ratio. The preparation method of the high-temperature high-entropy alloy is further provided and comprises the steps that 1) W, Ta, Mo, Nb and Zr raw materials with the needed weight are weighed; and 2) vacuum electric arc melting is carried out. The W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy prepared through the method can be used for overcoming the strength defect of a nickel-based high-temperature alloy at the temperature of 120 DEG C or above, and replaces the nickel-based high-temperature alloy to be used for the field of high-temperature structures.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a high-temperature resistant high-entropy alloy and a preparation method thereof, in particular to a W-Ta-Mo-Nb-Zr high-temperature high-entropy alloy and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the preparation technology of human beings in aerospace vehicles is constantly improving, and the dream is getting closer, but at the same time, the demand for ultra-high temperature performance of materials is increasing day by day. In order to meet the service and life extension requirements of aerospace vehicles under extreme conditions such as ultra-high temperature, high vacuum, and high pressure, in addition to relying on optimized structural design, it is also closely related to the performance of the equipment materials themselves. Metal components are required to have good high temperature toughness to avoid ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C28/00C22C30/00
Inventor 梁秀兵张志彬万义兴莫金勇胡振峰沈宝龙
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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