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A kind of w-re-ta-mo high temperature high entropy alloy and preparation method thereof

A high-entropy alloy and high-temperature technology, applied in the field of metal materials, can solve problems such as strength to be improved, poor plasticity, and high brittleness, and achieve stable high-temperature mechanical properties, less accidents, and stable crystal structures.

Active Publication Date: 2021-03-30
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 (Senkov O N, et al.Intermetallics[J], 2011,19(5):698-706.)

Method used

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  • A kind of w-re-ta-mo high temperature high entropy alloy and preparation method thereof
  • A kind of w-re-ta-mo high temperature high entropy alloy and preparation method thereof
  • A kind of w-re-ta-mo high temperature high entropy alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of embodiment 1WReTaMo high-temperature high-entropy alloy

[0041] The raw materials used are W elemental powder, Re elemental powder, Ta elemental powder, and Mo elemental particles, and the ingredients 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 WReTaMo high-temperature high-entropy alloy ingot was obta...

Embodiment 2

[0042] Performance test and structural characterization of embodiment 2 WReTaMo high-temperature high-entropy alloy ingot

[0043] 1. Density determination:

[0044] The Archimedes drainage method is used for measurement, and the specific operation steps are as follows: prepare the WReTaMo high-temperature high-entropy alloy prepared in Example 1 into three cylindrical samples of Φ4mm×4mm, and put them 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,

[0045]

[0046] 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 3

[0060] Example 3W 24 Re 25 Ta 25 Mo 26 Preparation, performance testing and structural characterization of high-temperature high-entropy alloys

[0061] The raw materials used are W elemental powder, Re elemental powder, Ta elemental powder, and Mo elemental particles, and follow W:Re:Ta:Mo=24:25:25:26. 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 minutes, and W is obtained after cooling 24 Re...

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Abstract

The invention provides a W-Re-Ta-Mo high-temperature high-entropy alloy and a preparation method thereof. The high-temperature high-entropy alloy consists of W, Re, Ta and Mo in equal atomic ratio ornon-equal atomic ratio. The invention further provides a preparation method for the high-temperature high-entropy alloy. The preparation method comprises the following steps of (1) weighing W, Re, Taand Mo raw materials with required weight; and (2) performing vacuum electric arc melting. The W-Re-Ta-Mo high-temperature high-entropy alloy prepared by the preparation method has the characteristicsof high melting point, high compressive strength, stable high-temperature structure property and easiness in preparation, can be used for making up for strength deficiency of nickel-based high-temperature alloy at temperature above 1,200 DEG C, and can be used in the field of high-temperature structures instead of the nickel-based high-temperature alloy.

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-Re-Ta-Mo high-temperature high-entropy alloy and a preparation method thereof. Background technique [0002] Superalloys refer to a class of metal materials with iron, cobalt, and nickel as the main alloy components, and the working temperature is higher than 600 °C. When serving at high temperatures, superalloys generally exhibit high high-temperature strength and high-temperature structural stability, and have good high-temperature oxidation resistance, high-temperature fatigue resistance, corrosion resistance, and fracture toughness. [0003] The development of superalloys in China has been more than 60 years, which can be roughly divided into three stages. The first stage is the initial stage, from the 1950s to the 1970s, mainly under the guidance of experts from the former Sov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 梁秀兵莫金勇孙博万义兴张志彬沈宝龙
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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