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A kind of face-centered cubic high-entropy alloy with high strength and toughness and preparation method thereof

A face-centered cubic, high-entropy alloy technology, applied in the field of strengthening and toughening high-entropy alloy materials, can solve the problems that limit the application of face-centered cubic high-entropy alloys, and the strength needs to be improved, so as to avoid decomposition or phase transition, facilitate deformation, The effect of improving the strength of the alloy

Active Publication Date: 2022-03-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CoCrFeMnNi is the earliest high-entropy alloy with FCC structure. FCC high-entropy alloys show excellent plasticity, but their strength needs to be improved.
Li Zhiming used the "metastable project" to design a phase transformation-induced dual-phase high-entropy alloy, which effectively improved the tensile fracture strength of the alloy, but its yield strength was only 253 MPa, and the low yield strength severely limited the application of face-centered cubic high-entropy alloys.

Method used

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  • A kind of face-centered cubic high-entropy alloy with high strength and toughness and preparation method thereof
  • A kind of face-centered cubic high-entropy alloy with high strength and toughness and preparation method thereof
  • A kind of face-centered cubic high-entropy alloy with high strength and toughness and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method of preparing a high-strength toughness of the facial cubic high entropy alloy, including the following steps:

[0038] Press Fe: 49At.%, Mn: 30 at.%, CO: 10.5At.%, Cr: 9.5t.%, C: 1t.% Atomic percentage of atomic percentage of Fe, Mn, Co, Cr and C 50kg, also weigh 0.045kg Al Als, 0.045kg CE single texture, spare;

[0039] The addition of Fe, Mn, Co, Cr and Al metallic is added to the vacuum induction melting furnace, vacuuming to 0.06 MPa, after induction is heated to completely melting, opening electromagnetic stirring, refined at 70 kW of power;

[0040] Under the protection of the argon atmosphere, adding a good C using the refined alloy, smelting 4 min at a 70 kW of power; and then adding a good CE metal single sheet to the alloy after smelt treatment, 70 kW After the power is smelted for 2 min, after repeatedly smelting 5 times, then in 1650 ° C flooding into the mold, then cut off the rush, obtain a ingot having a thickness of 100 mm; ...

Embodiment 2

[0048] This embodiment provides a method of preparing a high-strength toughness of the facial cubic high entropy alloy, including the following steps:

[0049] Press Fe:. 49at%, Mn:. 30at%, Co:. 10.5at%, Cr:. 9.5at%, C:. 1at% atomic percentage of the respective weighing Fe, Mn, Co, Cr and elemental C total 50kg, 0.075kg Al were weighed 0.025kg Ce elemental and elemental standby;

[0050] The addition of Fe, Mn, Co, Cr and Al metallic is added to the vacuum induction melting furnace, vacuuming to 0.06 MPa, after induction is heated to completely melting, opening electromagnetic stirring, refined at 70 kW of power;

[0051] Under the protection of the argon atmosphere, adding a good C using the refined alloy, smelting 4 min at a 70 kW of power; and then adding a good CE metal single sheet to the alloy after smelt treatment, 70 kW After the power is smelted for 2 min, after repeatedly smelting 5 times, then in 1650 ° C flooding into the mold, then cut off the rush, obtain a ingot hav...

Embodiment 3

[0059] This embodiment provides a method of preparing a high-strength toughness of the facial cubic high entropy alloy, including the following steps:

[0060] Press Fe:. 49at%, Mn:. 30at%, Co:. 10.5at%, Cr:. 9.5at%, C:. 1at% atomic percent of the respective weighing Fe, Mn, Co, Cr and elemental C co 50kg, 0.075kg Al were weighed 0.025kg Ce elemental and elemental standby;

[0061] The addition of Fe, Mn, Co, Cr and Al metallic is added to the vacuum induction melting furnace, vacuuming to 0.06 MPa, after induction is heated to completely melting, opening electromagnetic stirring, refined at 70 kW of power;

[0062] Under argon atmosphere, into a refining alloys were weighed and added elemental good C, 4min melting at 70KW power; alloy smelted again after treatment weighed good Ce added elemental metal, of at 70KW 2min after the melting at a power, smelting repeated five times, at 1650 deg.] C and then cast into a mold inversion, cut riser after cooling, to obtain an ingot having ...

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Abstract

The invention discloses a face-centered cubic high-entropy alloy with high strength and toughness and a preparation method thereof, belonging to the technical field of strengthening and toughening high-entropy alloys. The first smelting; then under inert gas, add C elemental substance to the alloy after the first smelting for the second smelting; add rare earth elements for the third smelting, and then cast it at 1100~1300℃ Keeping at temperature for 1 to 3 hours to obtain alloy ingots, and hot rolling them to deform the thickness to 3 mm, remove the oxide layer on the surface after cooling to room temperature, and then undergo cold rolling to deform the thickness to 1 mm to obtain Alloy crude product: place the above-mentioned rolled alloy in a heat treatment furnace at a temperature of 650-900° C. for 0.5-2 hours, take it out for water cooling, and obtain the target composition face-centered cubic high-entropy alloy. The invention provides guidance for subsequent heat treatment through composition design and phase diagram calculation, so that the strength of the alloy is greatly improved, and the alloy has higher plasticity at the same time.

Description

Technical field [0001] The present invention relates to the field of strong toughening techniques of high entropy alloy materials, and more particularly to a high-strength toughness, high entropy alloy, and a preparation method thereof. Background technique [0002] Metal materials have always played a key role in the development of human society, and my country's scientific and technological development has also put forward higher requirements for high-performance new metal materials. High entropy alloys are alloy design philosophy with extensive application prospects in recent years. It consists of five or more elements, each of the main elements, between 5AT.% To 35AT.% (Atom). Breaking traditional alloys, a single-primary component design concept of a mixed enthalpy, the design of high entropy alloy is mainly based on configuration entropy, intending to maximize configuration entropy, thus promoting alloy forming a simple solid solution. The unique solid solution structure ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C30/00C22F1/16
CPCC22C1/02C22C30/00C22F1/16
Inventor 李小琳郝晓晓王海丰邓想涛
Owner NORTHWESTERN POLYTECHNICAL UNIV