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Re-containing high-density ReWTaMoNbx high-entropy alloy material and preparing method thereof

A high-entropy alloy and alloy material technology, applied in the field of high-density ReWTaMoNbX high-entropy alloy materials and preparation, can solve the problems of low density of high-entropy alloys, achieve the effects of reducing air content, improving alloy uniformity, and high hardness

Active Publication Date: 2018-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the densities of the high-entropy alloys developed so far are all low, among which WNbMoTa has the highest density, only 13.75g / cm 3
At the same time, there are few reports on high-entropy alloy systems with high density Re

Method used

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  • Re-containing high-density ReWTaMoNbx high-entropy alloy material and preparing method thereof
  • Re-containing high-density ReWTaMoNbx high-entropy alloy material and preparing method thereof
  • Re-containing high-density ReWTaMoNbx high-entropy alloy material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of ReWTaMo high-entropy alloys. The specific steps are as follows:

[0035] (1) Mixing: Weigh 5.2794g of Re powder, 4.9750g of W powder, 4.9853g of Ta powder, and 2.5935g of Mo powder with a purity of 99.9% (Re / W / Ta / Mo / Nb molar ratio is 1.05:1:1.02 :1:0), the particle size of the powder is 20 μm; use a light ball mill to mix evenly for 30 hours to obtain a mixed powder.

[0036] (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.

[0037] (3) Preparation of high-entropy alloys 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 reach -0.01MPa relative to the standard atmospheric pressure, and quickly start the arc to reduce the output power. Adjust to 45%-50% (current: 225-250A) for smelting for 2 minut...

Embodiment 2

[0040] Preparation of ReWTaMoNb 0.2 . The specific steps are as follows:

[0041] (1) Mixing: Weigh 5.0280g of Re powder, 7.7199g of W-Mo alloy powder, 4.7410g of Ta powder, and 0.5023g of Nb powder with a purity of 99.9% (Re / W / Ta / Mo / Nb molar ratio is 1: 1.02:0.97:1.02:0.2), the particle size of the powder is 2 μm; use a light ball mill to mix evenly for 24 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 350 MPa) using a tablet press, with a holding time of 8 minutes to obtain a prefabricated block.

[0043] (3) Preparation of high-entropy alloys 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 reach -0.01MPa relative to the standard atmospheric pressure, and quickly start the arc to reduce the output power. Adjust to 45%-50% (current: 225-250A) ...

Embodiment 3

[0046] Preparation of ReWTaMoNb 0.5 . The specific steps are as follows:

[0047] (1) Mixing: take by weighing 99.9% of Re powder 5.0280g, W powder 4.7263g, Ta powder 4.8876g, Mo powder 2.7232g, Nb powder 1.2558g (Re / W / Ta / Mo / Nb mol ratio is 1:0.95:1:1.05:0.5), the particle size of the powder is 10 μm; use a light ball mill to mix evenly for 20 hours to obtain a mixed powder.

[0048] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mold, and perform cold high-pressure molding (pressure 400 MPa) with a tablet press for 5 minutes to obtain a prefabricated block.

[0049] (3) Preparation of high-entropy alloys 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 reach -0.01MPa relative to the standard atmospheric pressure, and quickly start the arc to reduce the output power. Adjust to 45%-50% (current: 225-250A) for smelting for 3 minutes. Afterwa...

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Abstract

The invention discloses a Re-containing high-density ReWTaMoNbx high-entropy alloy material and a preparing method thereof. The alloy material is composed of ReWTaMoNbx, the molar ratio of any two elements in Re / W / Ta / Mo elements in the alloy is 0.95-1.05, and the molar ratio of the Nb to any element is x=0-1. The preparing method includes the following steps that material mixing is carried out, wherein Re, W-Mo, Ta and Nb metal powder is weighed, and ball milling is carried out to achieve even mixing; precast blocks are prepared, wherein cold high-pressure molding technology is adopted, mixedpowder prepared in the step one is prepared into the precast blocks; and electric arc melting is carried out to prepare a high-entropy alloy, wherein a high vacuum nonconsumable arc smelting furnace is adopted for smelting the precast blocks into master alloy pigs under high-purity argon shielding. The obtained high-entropy alloy material has high density and high hardness, the density is not lower than 15 g / cm<3>, the hardness is not lower than 5700 MPa, and the material can be applied to the field of nuke industry, aerospace, high pressure physics and the like.

Description

technical field [0001] The invention relates to a high-density ReWTaMoNb containing Re X A high-entropy alloy material and a preparation method belong to the technical field of alloy materials. Background technique [0002] Due to the high mixing entropy of high-entropy alloys, which is higher than the melting entropy of alloys, the alloys will not form a large number of intermetallic compounds after solidification, but will form simple solid solution phases such as body-centered cubic or face-centered cubic. At the same time, high-entropy alloys have severe lattice distortions leading to high solid solution strengthening and hysteretic diffusion of atoms, so they have a series of excellent properties, including high hardness, high work hardening, high temperature softening resistance, corrosion resistance, and high electrical resistivity. The combination of high-entropy alloys makes the application level of high-entropy alloys colorful, and the potential application prospe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 沈强魏琴琴康克家罗国强张建王传彬张联盟
Owner WUHAN UNIV OF TECH
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