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FeCrNiAlTi-series dual-phase high-entropy alloy and preparing method thereof

A high-entropy alloy and alloy technology, applied in the field of high-entropy alloys, can solve the problems of unrealistic production and application and high cost of high-entropy alloys, and achieve the effects of high strength and hardness, excellent performance, and excellent corrosion resistance.

Inactive Publication Date: 2019-10-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of high-entropy alloys is relatively high, and it is not practical to want a wide range of production applications

Method used

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  • FeCrNiAlTi-series dual-phase high-entropy alloy and preparing method thereof
  • FeCrNiAlTi-series dual-phase high-entropy alloy and preparing method thereof
  • FeCrNiAlTi-series dual-phase high-entropy alloy and preparing method thereof

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Experimental program
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Embodiment 1

[0033] This embodiment is a FeCrNiAlTi-based high-entropy alloy composed of five elements, Fe, Cr, Ni, Al, and Ti, and the atomic percentage ratio of Fe, Cr, Ni, Al, and Ti is 28.6667:28.6667:28.6667:7: .

[0034] The raw materials for preparing this alloy are pure Fe, pure Cr, pure Ni, pure Al and pure Ti. The mass of each element metal is shown in the table below:

[0035] Table 1 raw material ratio:

[0036]

[0037] The specific implementation process is as follows:

[0038] A preparation method of FeCrNiAlTi system high-entropy alloy, comprising the following steps:

[0039]Step 1. Pretreatment of raw materials: selecting pure Fe, pure Cr, pure Ni, pure Al and pure Ti with a purity greater than 99.9% for batching. The oxide skin on the metal surface needs to be polished off before batching. Put the polished raw materials into a beaker filled with absolute ethanol, and then put them into an ultrasonic cleaner for about 10 minutes to remove impurities and stains on ...

Embodiment 2

[0051] Example 2: Calculation (FeCrNi) 86 Al 7 Ti 7 Related parameters of high-entropy alloys, such as atomic size difference δ, mixing entropy S mix , Mixing enthalpy △ H mix , mixed melting point Tm, valence electron concentration VEC, electronegativity difference Δχ, parameter Ω are summarized in Table 2. The physical and chemical parameter criteria for forming high-entropy alloy solid solution are: δ≤6.6% and Ω≥1.1. (FeCrNi) 86 Al 7 Ti 7 δ=5.5171%, Ω=1.8357, so high-entropy alloy solid solution can be formed.

[0052] Table 2 Calculation table of relevant parameters of high-entropy alloy

[0053]

[0054] The calculation formulas of relevant parameters are as follows:

[0055]

[0056] Among them, C i — molar percentage of i component, ri — atomic radius of i component

[0057]

[0058] Among them,—the mixing enthalpy between i,j components, ri ,rj—the atomic radius of i,j components

[0059]

[0060] Among them, R—molar gas constant, R=8.3144J / (mo...

Embodiment 3

[0065] Example 3: Test Step 3 (FeCrNi) 86 Al 7 Ti 7 The instrument used for the micro-Vickers hardness is the MH-600 micro-hardness tester. Before the experiment, the samples cut by wire cutting were first mounted with a hot mounting machine, and then polished on 400, 600, 800, 1000, 1200, 1500 and 2000 mesh sandpaper in order until there were no scratches visible to the naked eye, and then polished It is polished on the machine, and no scratches can be observed under a 100x optical microscope. Generally, the measurement needs to be tested at 5-10 different positions, and the average value of the results is taken to ensure the accuracy of the test. The distance between every two positions should be greater than four times the length of the diagonal line, and a maximum value and a minimum value should be removed when calculating the average hardness value to reduce errors. The test uses a test force of 1000gN and loads for 15 seconds. The 10 measurements are summarized in ...

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Abstract

The invention discloses a FeCrNiAlTi-series dual-phase high-entropy alloy and a preparing method thereof. Fe, Cr and Ni serve as base bodies, the alloy is formed through equal atomic ratios, a small amount of Al and Ti is added, and the (FeCrNi)86Al7Ti7 high-entropy alloy is formed. The alloy is formed through vacuum electric arc smelting of pure Fe, pure Cr, pure Ni, pure Al and pure Ti with thepurity larger than 99.9% according to the atom ratios. The process of preparing the raw material mainly comprises the three steps of raw material pretreatment, weighing and smelting. Through calculation of physicochemical parameters of the alloy, it proves that the parameters meet the thermodynamic criteria forming the high-entropy alloy solid-solution body, the experimental analysis shows that the alloy is of a dual-phase structure of BCC and FCC coexistence, the enough high strength and hardness are achieved, in addition, the alloy has the excellent corrosion resisting property, and the alloy can be widely applied to environment such as a power plant and a sewage treatment works.

Description

technical field [0001] The invention relates to a FeCrNiAlTi-based dual-phase high-entropy alloy and a preparation method thereof, belonging to the technical field of high-entropy alloys. Background technique [0002] As a material widely used in our daily life, metal materials play an extremely important role in the development of human society. In the past hundred years, this field has achieved the fastest development in history. Due to the limitations of the properties of pure metals, various alloys such as aluminum alloys, magnesium alloys, heat-resistant alloys, and shape memory alloys have been designed through alloying processes, which are widely used in daily life, industry, and national defense. However, the design of alloys based on single-component systems is approaching the limit of their performance enhancement due to the mutual constraint relationship between strength and plasticity. Therefore, it is undoubtedly a huge challenge to design metal materials that...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02B22D18/06
CPCB22D18/06C22C1/02C22C30/00
Inventor 乔珺威王重袁家乐石晓辉杨慧君张敏王雪姣吴玉程
Owner TAIYUAN UNIV OF TECH
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