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Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and preparation method of Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy

A co-cr-fe-ni-v-b, high-entropy alloy technology, applied in the field of high-entropy alloys, can solve the problems of rare reports on the non-metallization design of eutectic high-entropy alloys, and achieve significant thermal modification characteristics and less casting The effect of improving defect and fracture toughness

Active Publication Date: 2022-06-24
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification in view of the problems that the non-metallization design of eutectic high-entropy alloys is rarely reported.

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  • Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and preparation method of Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy
  • Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and preparation method of Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy
  • Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and preparation method of Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy

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Embodiment 1

[0028] This embodiment discloses a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification, the general formula of which is CoCrFeNi 2 V 0.8 B 0.4 Hypoeutectic alloy composition.

[0029]In this embodiment, the steps of a preparation method of a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification are as follows: placing an inorganic non-metallic elemental raw material B in a copper crucible in an arc melting furnace At the bottom, the metal elemental raw materials Co, Cr, Fe, Ni and V are covered on top of B. The purity of the selected metal elemental materials is 99.95wt.%, while the purity of inorganic non-metallic materials is 99.99wt.%. The vacuum chamber is evacuated to 3.2×10 -3 pa, and then reversely fill with high-purity argon to -0.05MPa.

[0030] When the alloy ingot is smelted, the current is added to 270A, the smelting time is 110s, and the smelting is repeated 6 times to ensure a uniform structure. Finally, ...

Embodiment 2

[0033] This embodiment discloses a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification, the general formula of which is CoCrFeNi 2 V 0.94 B 0.47 Fully eutectic high-entropy alloy composition.

[0034] In this embodiment, the steps of a preparation method of a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification are as follows: placing an inorganic non-metallic elemental raw material B in a copper crucible in an arc melting furnace At the bottom, the metal elemental raw materials Co, Cr, Fe, Ni and V are covered on top of B. The purity of the selected metal elemental materials is 99.95wt.%, while the purity of inorganic non-metallic materials is 99.99wt.%. The vacuum chamber is evacuated to 3.2×10 -3 pa, and then reversely fill with high-purity argon to -0.05MPa.

[0035] When the alloy ingot is smelted, the current is added to 270A, the smelting time is 110s, and the smelting is repeated 6 times to ensure a uniform str...

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Abstract

The invention provides a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and a preparation method of the Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy. A general formula of the eutectic high-entropy alloy is CoaCrbFecNidVeBf, 0.8 < = a < = 1.2, 0.8 < = b < = 1.2, 0.8 < = c < = 1.2, 1.6 < = d < = 2.4, 0.8 < = e < = 1.2, 0.3 < = f < = 0.6, and a, b, c, d, e and f are molar ratios of corresponding elements respectively. According to the eutectic high-entropy alloy, through simple high-temperature annealing heat treatment, a long-strip-shaped M3B2 phase is effectively fused and spheroidized and is in a spherical shape, stress concentration is reduced, the fracture toughness of the alloy is greatly improved, and meanwhile the tensile strength is still kept at a high level. The eutectic high-entropy alloy shows a remarkable thermal modification characteristic and has a wide application prospect in the field of engineering structures.

Description

technical field [0001] The invention relates to high-entropy alloy technology, in particular to a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and a preparation method thereof. Background technique [0002] High-entropy alloys are a new class of materials that have developed rapidly in recent years, because of their excellent mechanical properties (high strength, high hardness, etc.) and special functional properties (irradiation resistance, soft magnetic properties, biocompatibility, etc.), It has received extensive attention in the field of materials research and is expected to become a potential structure-function integrated material in the future. However, due to the large variety of elements and the large difference in atomic size, high-entropy alloys have disadvantages such as poor fluidity, compositional segregation and various casting defects during the casting process. Although high-entropy alloys are composed of four or more prin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C30/00C22C1/02C22F1/00
Inventor 卢一平张令坤李廷举王同敏曹志强接金川张宇博康慧君郭恩宇
Owner DALIAN UNIV OF TECH
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