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High-strength high-toughness TiZrHfNbTaWx refractory high-entropy alloy and preparation method thereof

A high-entropy alloy, high-toughness technology, applied in the field of material processing, can solve the problems of cumbersome powder metallurgy preparation procedures, large alloy voids, low sintering temperature, etc., and achieves excellent high-temperature mechanical application prospects, uniform metallographic structure, and simple operation methods. Effect

Active Publication Date: 2021-11-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the cumbersome preparation procedures, high material selection requirements, and low sintering temperature, powder metallurgy has been generally "criticized" by researchers due to low density, large alloy voids, and poor plasticity.

Method used

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  • High-strength high-toughness TiZrHfNbTaWx refractory high-entropy alloy and preparation method thereof
  • High-strength high-toughness TiZrHfNbTaWx refractory high-entropy alloy and preparation method thereof
  • High-strength high-toughness TiZrHfNbTaWx refractory high-entropy alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment is a high-strength and high-toughness TiZrHfNbTaW x (x=0.25,0.5,0.75) The refractory high-entropy alloy is composed of Ti, Zr, Hf, Nb, Ta, W elements, and the molar ratio of Ti, Zr, Hf, Nb, Ta, W elements is 1 / (x +5):1 / (x+5):1 / (x+5):1 / (x+5):1 / (x+5):x / (x+5). For the preparation raw materials of this alloy, pure Ti, pure Zr, pure Hf, pure Nb, pure Ta, pure W are selected, and the specific quality of each material is shown in the table below:

[0034] Table 1 Ratio of Raw Materials

[0035]

[0036] The specific implementation process is as follows:

[0037] A High Strength and High Toughness TiZrHfNbTaW x (x=0.25,0.5,0.75) the preparation method of refractory high-entropy alloy comprises the following steps:

[0038] Step 1, pre-treatment: use a grinder to polish the surface scales of pure Ti, pure Zr, pure Hf, pure Nb, pure Ta, and pure W with a purity ≥ 99.95%, and then put them into a container filled with absolute ethanol In the beaker, use ult...

Embodiment 2

[0055] Embodiment 2: After calculating TiZrHfNbTaW x (x=0.25,0.5,0.75) Refractory high-entropy alloy (RHEA) related parameters mixing melting point Tm, mixing entropy △Smix, mixing enthalpy △Hmix, atomic size difference δ, parameter Ω, valence electron concentration VEC, electronegativity difference Δχ is summarized in Table 2. For BCC refractory high-entropy alloys, the atomic size difference δ, mixing enthalpy △Hmix, valence electron concentration VEC, and Ω criteria are more meaningful. When Ω≥1.1, δ≤6.6, the alloy tends to form a solid solution. However, Ω=31.8 of TiZrHfNbTaW0.25 refractory high-entropy alloy is much larger than 1.1, and δ=4.242<6.6. Therefore, TiZrHfNbTaW0.25 alloy is a single-phase solid solution, known as a refractory high-entropy alloy.

[0056] Table 2 Calculation table of related parameters of TiZrHfNbTaW0.25 refractory high-entropy alloy

[0057]

[0058] The calculation formulas of relevant parameters are as follows:

[0059]

[0060] ...

Embodiment 3

[0066] Example 3: The instrument used for testing the micro-Vickers hardness of the alloy obtained in step 3 is MH-600 microhardness tester with a load of 500 g and a retention time of 30 s.

[0067] Before the experiment, the sample was treated with 240#, 600#, 800#, 1000#, 1200#, 1500#, 2000#, 3000#, 4000# sandpaper to polish the surface of the sample, and then polished to ensure the sample plane It is flat enough. In order to ensure the accuracy of the experimental results, select different positions for each sample to test 5 times, and finally read the Vickers hardness value of the alloy displayed by the microscope. After the test, the average value of the 5 measurements is taken as the final value. They are summarized in Table 3 below:

[0068] Table 3 Microhardness of TiZrHfNbTaW0.25 refractory high-entropy alloy

[0069]

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Abstract

The invention discloses a high-strength and high-toughness TiZrHfNbTaWx refractory high-entropy alloy and a preparation method thereof. The proportion of the elements is as follows: when x is equal to 0.25, the molar ratio of Ti to Zr to Hf to Nb to Ta to W is 19.05 to 19.05 to 19.05 to 19.05 to 19.05 to 4.76; when x is equal to 0.5, the molar ratio of the Ti to Zr to Hf to Nb to Ta to W is 18.18 to 18.18 to 18.18 to 18.18 to 18.18 to 9.09; and when x is equal to 0.75, the molar ratio of the elements of the Ti, Zr, Hf, Nb, Ta and W is 17.39 to 17.39 to 17.39 to 17.39 to 17.39 to 13.04. The TiZrHfNbTaWx single-phase refractory high-entropy alloy is prepared by adopting a non-consumable vacuum arc furnace technology, the method has the characteristics that the operation method is simple, elements of the alloy are fully compounded, the structure is uniform, the density is good, and the like.

Description

technical field [0001] The invention relates to a new material alloy and a preparation method thereof, in particular to a high-strength and high-toughness TiZrHfNbTaW x (x=0.25, 0.5, 0.75) refractory high-entropy alloys and a preparation method thereof belong to the field of material processing. Background technique [0002] With the continuous development of human society, the ever-changing service environment in various fields makes materials continue to develop, and the demand for materials with better performance in high-temperature environments is becoming stronger and stronger. High-temperature materials are mostly used in the aerospace field, such as high-temperature devices such as aero-engine turbine blades, rocket nozzles, and the leading edge of supersonic vehicles. Currently known superalloys mainly include: cobalt-based superalloys, iron-based superalloys and nickel-based superalloys. These superalloys can be used in environments up to 1000°C with stable mecha...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/03C22B9/20C22B9/04
CPCC22C30/00C22C27/02C22C1/03C22B9/20C22B9/04
Inventor 吴玉程黄文军乔珺威刘张全阴少春
Owner TAIYUAN UNIV OF TECH
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