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High-strength and large-plasticity multi-stage heterostructure medium-entropy alloy and preparation method thereof

A heterogeneous structure, high plasticity technology, applied in the direction of metal rolling, temperature control, elongation control, etc., can solve the problems of limited yield strength and limited engineering application, and achieve strong plastic deformation ability, improved yield strength and good toughness Effect

Active Publication Date: 2021-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, coarse-grained single-phase NiCoCr medium-entropy alloys are similar to fcc pure metals. Although they have high ductility, their yield strength is limited, which limits their engineering applications. Key issues that need to be addressed

Method used

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  • High-strength and large-plasticity multi-stage heterostructure medium-entropy alloy and preparation method thereof
  • High-strength and large-plasticity multi-stage heterostructure medium-entropy alloy and preparation method thereof
  • High-strength and large-plasticity multi-stage heterostructure medium-entropy alloy and preparation method thereof

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preparation example Construction

[0034] The preparation method of the NiCoCr medium entropy alloy of the above-mentioned dual-phase multi-level heterogeneous structure comprises the following steps:

[0035] Step 1. According to atomic percentage, uniformly mix metal particles of 29-33% Ni, 29-33% Co, 29-33% Cr, 9-12% Al and 1.0-3.0% Ta.

[0036] The weight of raw materials is accurate to 0.01g when weighing, and then the alloy is smelted by vacuum arc melting method.

[0037] During the smelting process, first vacuum to 3Pa, then pass high-purity argon gas and then evacuate, repeat the furnace washing three times to ensure a high-purity vacuum environment, the smelting induction current is 450-550A, the alloy smelting process is accompanied by electromagnetic stirring, and repeated remelting 5 times to ensure the uniformity of the composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0038] Step 2, performing homogenization treatment at a temperature of 1200-1240°C;

[003...

Embodiment 1

[0042] A method for preparing a NiCoCr medium-entropy alloy with a dual-phase multilevel heterogeneous structure, comprising the following steps:

[0043] Step 1. In atomic percentage, uniformly mix metal particles of 29% Ni, 31% Co, 33% Cr, 10% Al and 2% Ta.

[0044]During the smelting process, first vacuum to 3Pa, then pass high-purity argon gas and then evacuate, repeat the furnace washing three times to ensure a high-purity vacuum environment, the smelting induction current is 450A, the alloy smelting process is accompanied by electromagnetic stirring, and repeated remelting 5 times , to ensure the uniformity of the composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0045] Step 2, the alloy ingot is homogenized at 1200°C;

[0046] Step 3, hot rolling at 1150°C, the deformation is controlled at 70%, and the total rolling time is controlled to 10 minutes;

[0047] Step 4. Quenching treatment after the last hot rolling to retain medium-d...

Embodiment 2

[0050] A method for preparing a NiCoCr medium-entropy alloy with a dual-phase multilevel heterogeneous structure, comprising the following steps:

[0051] Step 1. In atomic percentage, uniformly mix metal particles of 31% Ni, 29% Co, 31% Cr, 9% Al and 3.0% Ta.

[0052] During the smelting process, first vacuum to 3Pa, then pass high-purity argon gas and then evacuate, repeat the furnace washing three times to ensure a high-purity vacuum environment, the smelting induction current is 500A, the alloy smelting process is accompanied by electromagnetic stirring, and repeated remelting 5 times , to ensure the uniformity of the composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0053] Step 2, the alloy ingot is homogenized at 1200°C;

[0054] Step 3, hot rolling at 1175°C, the deformation is controlled at 80%, and the total rolling time is controlled to 9 minutes;

[0055] Step 4. Quenching treatment after the last hot rolling to retain medium-...

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Abstract

The invention provides a high-strength and large-plasticity multi-stage heterostructure medium-entropy alloy and a preparation method thereof. Multiple strengthening mechanisms are introduced at the same time through component, process and structural design, so that the yield strength of the alloy is improved to 3-4 times. And each strengthening mechanism has obvious contribution, wherein the contribution of solid solution strengthening, dislocation strengthening, grain boundary strengthening and back stress strengthening to the strength is 274 MPa, 175 MPa, 189 MPa and 366 MPa respectively. However, the alloy still keeps an fcc matrix, so that the alloy still possesses good toughness while the strength of the alloy is improved. The high-strength and large-plasticity multi-stage heterostructure medium-entropy alloy has the advantages that the room-temperature mechanical property is excellent, the yield strength of the NiCoCr medium-entropy alloy is improved by 3.6 times to about 1100 MPa, the tensile strength is improved by 2 times to about 1400 MPa, and meanwhile, the alloy possesses 20% of tensile ductility. The NiCoCr medium-entropy alloy with the double-phase multistage heterostructure is excellent in comprehensive mechanical property, the process is simple and feasible, and the alloy has great engineering application prospects.

Description

technical field [0001] The invention relates to the technical field of high-performance alloy materials, in particular to a high-strength and large-plastic multi-level heterostructure medium-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloys (HEAs) are a new type of high-performance metal materials with broad application potential. HEAs break the traditional design concept of a single principal element of alloys and open up new ideas for alloy design. Moreover, due to its high mixing entropy effect, severe lattice distortion effect, hysteresis diffusion effect and "cocktail" effect, it has unique microstructure characteristics, and thus presents many unique properties different from traditional alloys, such as good comprehensive mechanical properties , ultra-high damage tolerance, excellent corrosion resistance and excellent radiation resistance, etc. [0003] Among the many HEAs systems at present, the H / MEA of the face-center...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C21D8/00C22F1/00C21D1/18B21B37/74B21B37/56B21B3/00
CPCC22C30/00C22C1/02C22F1/002C21D8/00C22C1/023C22C19/058C22C19/07C22F1/10B21B37/74B21B37/56B21B3/00
Inventor 张金钰张东东刘刚孙军
Owner XI AN JIAOTONG UNIV
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