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FeCrVTiCu high-entropy alloy and preparation method thereof

A high-entropy alloy and metal element technology, which is applied in the field of FeCrVTiCu high-entropy alloy and its preparation, can solve the problem of complex preparation process of high-entropy alloy powder metallurgy, affecting material tensile properties, fatigue properties, and low melting point metals are easy to evaporate and burn. and other problems, to achieve the effect of smaller grain size, lower cost and increased plasticity

Active Publication Date: 2021-07-23
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the problem faced by BCC-based high-entropy alloys is that the plasticity at room temperature is poor, which makes processing more difficult, but the high-temperature strength is slightly insufficient.
[0004] At present, domestic research on high-performance high-entropy alloys has also made some progress. For example, the Chinese patent CN201410386446.2 discloses an AlCrFeNiCuMo high-entropy alloy composed of FCC and BCC structures with good hardness, high compressive strength and outstanding Corrosion resistance, however, the preparation process of this method is complicated, and the powder metallurgy method makes the material have the possibility of segregation, voids and looseness
[0005] Chinese patent CN200810063807.4 discloses a high-entropy alloy composite material, in which a certain volume of reinforcing phase (such as TiC, TiB2, etc.) , induction melting, self-propagating-melting casting and other methods, the process is complicated, and the reinforcement phase in the obtained product is not uniform, and the high temperature performance is not good.
[0006] Chinese patent CN201610414014.7 discloses a FeSiBAlNiCo bulk high-entropy alloy. The high-entropy alloy includes FCC, BCC, intermetallic compounds FeSi and FeB, and the alloy hardness is above 1100HV. The internal voids seriously affect the tensile properties and fatigue properties of materials; it is difficult to obtain alloy materials with uniform structure and stable performance by plasma sintering technology, and low-melting point metals are easy to evaporate and burn during the smelting process, making it difficult to control the alloy composition. Uneven composition

Method used

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  • FeCrVTiCu high-entropy alloy and preparation method thereof

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preparation example Construction

[0037] The preparation method of FeCrVTiCu high-entropy alloy of the present invention comprises the steps:

[0038] Fe, Cr, V, Ti, Cu five metal elements are taken as raw materials, mixed according to the atomic percentage of the FeCrVTiCu high-entropy alloy, pressed into a billet, and then smelted to obtain the FeCrVTiCu high-entropy alloy;

[0039] The specific operation of the smelting is: firstly evacuate until the pressure in the smelting furnace is lower than 0.005Pa, then fill in argon to make the pressure in the furnace reach 14-20Pa, and then start to heat up at a rate of 55-65°C / min to 350-450°C, keep warm for 1-5min, then raise the temperature to 750-850°C at a rate of 35-45°C / min, keep warm for 3-8min, then raise the temperature to 1150-1250°C at a rate of 25-35°C / min, keep warm 3~8min, then raise the temperature to 1550~1650℃ at a rate of 15~25℃ / min, keep warm for 3~8min, then raise the temperature to 1750~1800℃ at a rate of 15~25℃ / min, keep warm for 8~15min, and...

Embodiment 1

[0052] The FeCrVTiCu high-entropy alloy is smelted using the following atomic percentage raw materials:

[0053] FeV50: 20%, Cr: 20%, Fe: 20%, Ti: 20%, Cu: 20%, wherein FeV50 is a vanadium-iron alloy containing 50wt% vanadium.

[0054] Prepare by following steps:

[0055] 1) Billet making: Take the raw materials containing the constituent elements of the FeCrVTiCu high-entropy alloy, mix them in a stainless steel ball mill tank for 20 minutes according to the element percentage, and the rotation speed is 200r / min; then press them into rods with a pressure of 30Mpa; The raw material is put into a graphite crucible coated with yttrium oxide, and then put into an induction melting furnace for melting;

[0056] 2) Melting: first use 2X-8 mechanical pump to evacuate to below 5Pa, then turn on TK-200 diffusion pump to evacuate below 0.005Pa, then turn off the diffusion pump and inject argon to make the pressure in the furnace reach 15Pa. Turn on the induction melting furnace to st...

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Abstract

The invention relates to a FeCrVTiCu high-entropy alloy and a preparation method thereof, and belongs to the technical field of alloy materials and preparation thereof. A high-strength FeCrVTiCu high-entropy alloy is provided. The FeCrVTiCu high-entropy alloy comprises five metal elements of, in atomic percentage, 8%-12% of V, 18%-23% of Cr, 18%-23% of Ti, 18%-23% of Cu, the balance Fe and inevitable impurities. The FeCrVTiCu high-entropy alloy disclosed by the invention is reasonable in component composition and higher in strength, and meets the requirements of materials such as bearings and structural load-bearing members on mechanical properties, meanwhile, the preparation process is simple, convenient to operate, lower in production cost, capable of achieving preparation of large-size cast ingots and suitable for industrial production.

Description

technical field [0001] The invention relates to a FeCrVTiCu high-entropy alloy and a preparation method thereof, and belongs to the technical field of alloy materials and preparation thereof. Background technique [0002] High-entropy alloys are a new class of alloys composed of five or more elements in equimolar or near-molar ratios. They have the characteristics of high entropy, slow diffusion, large lattice distortion and "cocktail" effect. Since Professor Ye Junwei from Taiwan, China proposed the new concept of high-entropy alloys in 1996, high-entropy alloys have attracted extensive attention from material science researchers at home and abroad. Starting from different alloy composition systems, researchers have carried out different studies on the microstructure and properties of high-entropy alloys. After Professor Ye Junwei proposed this concept, he studied the mechanical properties and microstructure of high-entropy alloys formed by five or more elements in FeAlCuN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/02C22F1/00
CPCC22C30/02C22C1/02C22F1/00
Inventor 李强
Owner PANZHIHUA UNIV
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