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

A w-ta-mo-nb-hf-c, high-entropy alloy technology, applied in the field of metal materials, to achieve the effects of reducing incidence, improving plasticity, and improving compressive strength

Active Publication Date: 2020-07-03
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

Especially alloys with high strength at 1800°C have not been reported

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of WTaMoNbHfC high-temperature high-entropy alloy

[0043] The raw materials used are W elemental powder, Ta elemental powder, Mo elemental particles, Nb elemental particles, HfC carbide powder, and W, Ta, Mo, Nb, Hf, and C elements are dosed in equal atomic 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 a liquid state for 20 minutes. After cooling, a WTaMoNbHfC high-temper...

Embodiment 2

[0044] Example 2 Performance test and structural characterization of WTaMoNbHfC high-temperature high-entropy alloy ingot

[0045] 1. Density determination:

[0046] The Archimedes drainage method is used for measurement, and the specific operation steps are as follows: the WTaMoNbHfC 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,

[0047]

[0048] In the formula, ρ 0 is the density of water, 0.9982g / cm 3 (20°C); ρ l is air density, 0.0012g / cm 3...

Embodiment 3W16

[0062] Example 3W 16 Ta 16 Mo 17 Nb 17 Hf 17 C 17 Preparation, performance testing and structural characterization of high-temperature high-entropy alloys

[0063] The raw materials used are W elemental powder, Ta elemental powder, Mo elemental particles, Nb elemental particles, HfC carbide powder, and according to W: Ta: Mo: Nb: Hf: C ​​= 16: 16: 17: 17: 17: 17 Atom ratio ingredients. 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, ...

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Abstract

The invention provides a W-Ta-Mo-Nb-Hf-C high-temperature high-entropy alloy and a preparation method thereof. The high-temperature high-entropy alloy is composed of an atomic ratio or a non-atomic ratio such as W, Ta, Mo, Nb, Hf, and C. The preparation method of the high-temperature high-entropy alloy comprises the following steps that 1) raw materials with the required weight of W, Ta, Mo, Nb, Hf, and C are weighed; and 2) vacuum arc melting is carried out. The W-Ta-Mo-Nb-Hf-C high-temperature high-entropy alloy prepared through the preparation method still has the strength of 266 MPa at 1800 DEG C, can be used for compensating the insufficient strength of nickel-base high-temperature alloy at the temperature of 1200 DEG C or above, and can replace the nickel-base high-temperature alloyto be used in 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-Hf-C high-temperature high-entropy alloy and a preparation method thereof. Background technique [0002] Near-space hypersonic vehicles have many advantages such as high speed, high maneuverability, and long-range precision strikes, which represent the development direction of aerospace vehicles. Exploring new high-temperature structural materials resistant to extreme environments has become an urgent need for the development of hypersonic vehicles and aerospace technology. At present, ultra-high temperature ceramics are generally used as materials for ultra-high temperature environments. However, the fracture toughness of ultra-high temperature ceramic bulk materials is low, and its thermal shock resistance is greatly affected by the size, which is the main reason restric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22C1/03C22C32/00
CPCC22C1/02C22C1/03C22C30/00C22C32/0052
Inventor 梁秀兵万义兴张志彬胡振峰莫金勇沈宝龙
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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