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High-entropy alloy and preparation method thereof

A high-entropy alloy and alloy technology, applied in the field of metal materials, can solve problems such as the reduction of the overall plasticity of the alloy

Inactive Publication Date: 2018-11-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the service environment temperature is reduced to 173K, the overall plasticity of the alloy is significantly reduced, and the maximum elongation is only 16 %

Method used

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  • High-entropy alloy and preparation method thereof
  • High-entropy alloy and preparation method thereof
  • High-entropy alloy and preparation method thereof

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[0034]The present invention also provides a method for preparing the high-entropy alloy described in the above technical solution, comprising the following steps:

[0035] (1) Smelting metal raw materials to obtain smelting liquid alloy water;

[0036] (2) casting the smelted liquid alloy water obtained in the step (1) into an ingot, hot forging and hot rolling in sequence to obtain an alloy precursor;

[0037] (3) The alloy precursor obtained in the step (2) is sequentially subjected to solid solution, cold rolling and calcining to obtain a high-entropy alloy.

[0038] The invention smelts metal raw materials to obtain smelting liquid alloy water. In the present invention, the smelting temperature is preferably 1700-1900°C, more preferably 1750-1850°C, most preferably 1780-1820°C. In the present invention, the smelting time is preferably 15-20 minutes, more preferably 16-19 minutes, and most preferably 17-18 minutes. In the present invention, the smelting atmosphere is pre...

Embodiment 1

[0050] A high-entropy alloy prepared from the following elements in atomic percent: 40.0% Fe, 10.0% Co, 40.0% Mn and 10.0% Cr.

[0051] The preparation method of above-mentioned high-entropy alloy comprises the following steps:

[0052] (1) Smelting the above-mentioned metal raw materials in a vacuum induction furnace at 1800°C for 5 times to obtain smelting liquid alloy water;

[0053] (2) The smelted liquid alloy water obtained in the step (1) is sequentially cast into cylindrical ingots, and the cylindrical ingots are hot-calcined at 1200° C. for 10 minutes, so that the cylindrical ingots become square in cross section (80×80mm 2 ) of a rectangular parallelepiped ingot, and then the rectangular parallelepiped ingot is hot-rolled at 900° C., and the relative pressing force of the hot rolling is 50%, to obtain an alloy precursor whose plate thickness is 40 mm;

[0054] (3) The alloy precursor obtained in the step (2) is solid-dissolved at 1200° C. for 2 hours, and cooled to...

Embodiment 2

[0063] A high-entropy alloy prepared from the following elements in atomic percent: 40.0% Fe, 10.0% Co, 40.0% Mn and 10.0% Cr.

[0064] The preparation method of above-mentioned high-entropy alloy comprises the following steps:

[0065] (1) Smelting the above-mentioned metal raw materials in a vacuum induction furnace at 1800°C for 5 times to obtain smelting liquid alloy water;

[0066] (2) The smelted liquid alloy water obtained in the step (1) is successively cast into cylindrical ingots, and the cylindrical ingots are hot-calcined at 1200° C. for 10 min, so that the cross-section of the cylindrical ingots becomes square ( 80×80mm 2 ) of a rectangular parallelepiped ingot, and then hot rolling the rectangular parallelepiped ingot at 900° C., the relative pressing force of the hot rolling is 50%, to obtain an alloy precursor whose plate thickness is 40 mm;

[0067] (3) The alloy precursor obtained in the step (2) is solid-dissolved at 1200° C. for 2 hours, cooled to room te...

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Abstract

The invention provides a high-entropy alloy, which relates to the technical field of a metal material. The high-entropy alloy comprises the following elements by atom percentage content: 39.0-41.0% ofFe, 9.0-11.0% of Co, 39.0-41.0% of Mn, and 9.0-11.0% of Cr. A stacking fault energy theoretical value of the high-entropy alloy is 35 mJ / mol, and the stacking fault energy is in favor of keeping a single-phase austenite structure when the high-entropy alloy is placed under environment lower than room temperature; stress load is bear under low temperature condition, dislocation glide and mechanical twining are generated, deformation induces austenite to change to martensite, when the high-entropy alloy is 173 K, the yield strength is 670 M, the stretching rate reaches 62%, and the tensile strength can reach 750 MPa; and the plasticity and intensity are higher than the mechanical properties of a steel product used for low temperature in a traditional method.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a nickel-free high-entropy alloy for low temperature and a preparation method thereof. Background technique [0002] High-entropy alloy breaks through the traditional single principal element alloy design concept, and is a new type of alloy formed by alloying multiple elements in an equiatomic ratio or close to an equiatomic ratio. Due to its excellent properties such as high strength, high hardness, high wear resistance and corrosion resistance, and high heat / resistance that cannot be compared with traditional metals, it has shown great application potential in the fields of aircraft, ships, high-speed cutting tools, and oil and gas resource development. High-entropy alloys may also be exposed to temperatures below zero degrees Celsius or even lower during processing and subsequent service. This requires not only high strength under harsh conditions, but also a certain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22F1/00
CPCC22C30/00C22C22/00C22C38/30C22C38/38C22F1/00
Inventor 贾楠何竹风马妲闫海乐姚春发赵骧
Owner NORTHEASTERN UNIV
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