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Preparation method of AlCoCrFeNi series double-phase structure high-entropy alloy

A high-entropy alloy and dual-phase structure technology, applied in the field of metal materials, can solve problems such as poor elongation, achieve high strength, improve structure unevenness, and improve the plasticity of the alloy

Active Publication Date: 2021-06-25
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Literature (A.Munitz, S.Salhov, S.Hayun, N.Frage, Heat treatment impacts the micro-structure and mechanical properties of AlCoCrFeNi high entropy alloy, Journal of Alloys and Compounds, 2016,683:221-230.) report, During the heat treatment process of the equiatomic ratio AlCoCrFeNi high-entropy alloy, significant phase transformations occurred in the dendrite region and the intergranular region, and the compression elongation of the heat-treated alloy increased. Poor elongation during tensile test

Method used

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  • Preparation method of AlCoCrFeNi series double-phase structure high-entropy alloy
  • Preparation method of AlCoCrFeNi series double-phase structure high-entropy alloy
  • Preparation method of AlCoCrFeNi series double-phase structure high-entropy alloy

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Embodiment 1

[0045] (1) Select high-purity metals with a purity of 99.99%, including aluminum, cobalt, chromium, iron, and nickel, as raw materials, according to Co: 20.91wt.%, Cr: 18.45wt.%, Fe: 19.82wt.%, Ni : 31.24wt.%, the balance is the ratio of Al to weigh the corresponding metal, put it in the copper crucible of the vacuum arc melting equipment, and use the mechanical pump and the molecular pump to vacuum the arc melting furnace to 3×10 -3 Pa, filled with high-purity argon to 1.6×10 3 Pa, this process is repeated 5 times to fully remove the oxygen in the furnace cavity.

[0046] (2) Vacuum arc melting process is used to melt high-purity metals to obtain ingots. During the process, the ingots are turned over with the help of a mechanical arm and then smelted again. This operation is repeated 5 times to ensure uniform alloy composition. During the first smelting, the current is controlled at 170A to slowly melt the high-purity metal, and during the 2nd to 5th smelting, the current is...

experiment example 1

[0054] The high-entropy alloy casting bar microstructure that embodiment 1 step 5 obtains is observed, and the results are shown in figure 1 . in, figure 1 b is figure 1 Enlarged view of the white framed area in a. Depend on figure 1 It can be seen that the as-cast high-entropy alloy has a typical dendrite structure morphology, the dendrite region is a dual-phase nanostructure, and the intergranular region is dominated by FCC phase.

[0055] The microstructure of the AlCoCrFeNi dual-phase structure high-entropy alloy obtained in Comparative Example 1 was observed, and the results are shown in figure 2 . Depend on figure 2 a It can be seen that a new flocculent phase is precipitated in the alloy dendrite area of ​​the heat-treated alloy at 650 °C, and this phase is the FCC phase. figure 2 b&c confirmed that the dendrite region is mainly composed of disordered BCC and ordered B2 nano-duplexes, which is consistent with the dendrite region of the as-cast alloy (see figu...

Embodiment 2

[0062] Concrete method is the same as embodiment 1, and difference only is that heat treatment time is 2 hours in step (6).

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Abstract

The invention belongs to the technical field of metal materials, and particularly discloses a preparation method of an AlCoCrFeNi series double-phase structure high-entropy alloy. The method aims at a brittle body-centered cubic high-entropy alloy with typical dendritic structure morphology, in the heat treatment process, a disordered body-centered cubic phase can be converted into an ordered body-centered cubic phase and a face-centered cubic phase after phase change, the microstructure is changed, and a thick dendritic crystal structure disappears and is converted into a double-phase net-shaped structure composed of a face-centered cubic phase and a body-centered cubic phase. Wherein the content of the in-situ synthesized face-centered cubic phase is increased, and the plasticity of the body-centered cubic-based high-entropy alloy is effectively improved. The method is different from a method for directly introducing an FCC phase by adjusting components, a complex processing technology is also avoided, the comprehensive mechanical properties of high strength and high plasticity can be obtained only by carrying out simple heat treatment on the as-cast alloy, the machinability of the alloy is improved, and the alloy has great practical application potential.

Description

Technical field [0001] The invention relates to the technical field of metal materials, and in particular to a method for preparing an AlCoCrFeNi-based dual-phase structure high-entropy alloy. Background technique [0002] High-entropy alloys are one of the hot spots in the field of metallic materials research in recent years. They are usually composed of a variety of elements in equiatomic or near-equiatomic ratios. They have large development space and strong designability. It has been found that high-entropy alloys have excellent properties such as high strength, high hardness, good wear resistance and corrosion resistance, excellent low-temperature properties, resistance to radiation, and resistance to high-temperature softening. They are a new type of metal structure with great development potential. Material. [0003] Due to the contradictory relationship between strength and plasticity, the development of advanced materials with both high strength and high plasticity...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C1/02C22C30/00C22F1/00
Inventor 曹雷刚侯鹏宇朱琳崔岩杨越
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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