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a raised al 0.3 A method for the strength of cocrfeni high-entropy alloys

A high-entropy alloy and strength technology, applied in metal material coating process, solid-state diffusion coating, vacuum evaporation coating, etc., to achieve the effect of increasing yield strength, increasing tensile strength, and stabilizing grain boundaries

Active Publication Date: 2020-05-19
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Recently, Al x The CoCrFeNi alloy system has been proven many years ago that the system can transform from FCC to BCC phase only by increasing the Al content (F. Otto, Y. Yang, H. Bei, E.P. George, ActaMaterialia. 61 (2013) 2628 -2638.), although the strength and hardness increase with increasing volume fraction of BCC phase, the alloy also becomes brittle

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  • a raised al <sub>0.3</sub> A method for the strength of cocrfeni high-entropy alloys
  • a raised al <sub>0.3</sub> A method for the strength of cocrfeni high-entropy alloys
  • a raised al <sub>0.3</sub> A method for the strength of cocrfeni high-entropy alloys

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Embodiment 1

[0030] This embodiment provides an Al 0.3 The strengthening method of CoCrFeNi high-entropy alloy includes the following contents:

[0031] 1. The preparation of multi-principal high-entropy alloys is a key step, and the preparation process has the following steps in sequence:

[0032] (1) Raw material preparation: The alloy smelting raw materials used in the present invention are high-purity (≥99.9%) Al, Co, Cr, Fe and Ni elements, which are accurately weighed and proportioned according to the molar ratio. Before smelting, the metal surface The oxides are ground and ultrasonically cleaned with alcohol for use in smelting to prepare alloys. The quality of each component of the alloy is shown in Table 1.

[0033] Table 1 The quality of each ingredient in the ingredients

[0034]

[0035](2) Preparation of high-entropy alloys: The equipment used for smelting is a WK-II vacuum electric arc furnace. Before smelting, the water-cooled copper crucible in the furnace needs to be...

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Abstract

The invention discloses a method for improving Al0.3CoCrFeNi high-entropy alloy intensity. Five kinds of analytical pure metals of Al, Co, Cr, Fe and Ni are blended according to the atomic ratio of 0.3 to 1 to 1 to 1 to 1, smelting is carried out in a vacuum arc melting furnace, the molten alloy is subjected to suction casting to form plate-shaped high-entropy alloy materials with 2mm thickness, 10mm width and 85mm length, and then a high-entropy alloy is subjected to cold rolling and annealing heat treatment to eliminate the residual internal stress, generated in the casting process, of the high-entropy alloy; and then a wire cutting machine is used for cutting bone-shaped standard tensile samples with a standard distance of 5mm, the front faces and back faces and the two side faces of the tensile samples are polished, and the polished samples are subjected to a double-glow chromizing test by using a double-glow metal furnace, and finally, the obtained samples are strengthened high-entropy alloy samples. According to the method for improving the Al0.3CoCrFeNi high-entropy alloy intensity, through a double-glow chromizing technology, the friction coefficient of the high-entropy alloy is reduced, and the amplitude is greatly reduced.

Description

technical field [0001] The present invention relates to a method for improving Al 0.3 A method for the strength of a CoCrFeNi high-entropy alloy belongs to the field of metal material preparation and reprocessing. Background technique [0002] In recent years, in order to meet the increasingly higher requirements for the physical and chemical properties of materials in the development of science and technology and engineering construction, many methods have been used to improve the properties of materials. One is innovation in manufacturing methods, such as rapid solidification, mechanical alloying, semi-solid casting, injection molding, cross-extrusion, isometric extrusion, and superplastic forming. The second is innovation in material composition, such as high-entropy alloys, metal matrix composites, intermetallic compound alloys, amorphous alloys, etc. It is worth noting that the research and development of new alloy systems is increasingly favored by domestic and foreig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C30/00C22F1/08C23C10/10C23C14/34
Inventor 乔珺威曹晋玮乔春光石晓辉杨慧君吴玉程
Owner TAIYUAN UNIV OF TECH
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