A kind of nicocr-based medium-entropy alloy with excellent strength-plasticity matching and its preparation method

A technology of entropy alloying and strength, applied in the field of entropy alloying and preparation in NiCoCr-based medium, can solve the problems of limited yield strength, etc., and achieve the effects of increased twinning content, significant solid solution strengthening effect, and simple preparation method.

Active Publication Date: 2021-11-19
XI AN JIAOTONG UNIV
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Problems solved by technology

However, coarse-grained NiCoCr medium-entropy alloys are similar to fcc pure metals. Although they have high ductility, their yield strength is limited, and it is difficult to meet the needs of structural material applications. Therefore, how to increase the yield strength of coarse-grained NiCoCr while maintaining good plasticity is the current Key issues that need to be addressed

Method used

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  • A kind of nicocr-based medium-entropy alloy with excellent strength-plasticity matching and its preparation method
  • A kind of nicocr-based medium-entropy alloy with excellent strength-plasticity matching and its preparation method
  • A kind of nicocr-based medium-entropy alloy with excellent strength-plasticity matching and its preparation method

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preparation example Construction

[0029] The preparation method of the above-mentioned NiCoCr-AlTa series medium entropy alloy comprises the following steps:

[0030] Step 1. According to atomic percentage, uniformly mix metal particles of 29-33% Ni, 29-33% Co, 29-33% Cr, 4-8% Al and 1.0-3.0% Ta.

[0031] The weight of raw materials is accurate to 0.01g when weighing, and then the alloy is smelted by vacuum arc melting method.

[0032] During the smelting process, first vacuum to 5Pa and 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 400-500A. 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;

[0033] Step 2, the alloy ingot is homogenized at 1150-1250°C;

[0034] Step 3, cold rolling at room temperature, the amount of defo...

Embodiment 1

[0037] A kind of preparation method of NiCoCr-AlTa system entropy alloy, comprises the following steps:

[0038] Step 1. In atomic percentage, uniformly mix metal particles of 29% Ni, 31% Co, 33% Cr, 4% Al and 3% Ta.

[0039] During the smelting process, first vacuum to 5Pa, 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 400A, 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;

[0040] Step 2, the alloy ingot is homogenized at 1150°C;

[0041] Step 3, cold rolling at room temperature, the amount of deformation is controlled at 50%;

[0042] In step 4, a single-phase fcc alloy is obtained after recrystallization annealing at 1100°C.

[0043] In the single-phase fcc structure, the equiaxed...

Embodiment 2

[0045] A kind of preparation method of NiCoCr-AlTa system entropy alloy, comprises the following steps:

[0046] Step 1. In atomic percentage, uniformly mix metal particles of 31% Ni, 29% Co, 31% Cr, 7% Al and 2.0% Ta.

[0047]During the smelting process, first vacuum to 5Pa, 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 6 times , to ensure the uniformity of the composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0048] Step 2, the alloy ingot is homogenized at 1200°C;

[0049] Step 3, cold rolling at room temperature, the amount of deformation is controlled at 65%;

[0050] Step 4: After recrystallization annealing at 1150° C., a single-phase fcc alloy is obtained.

[0051] In the single-phase fcc structure, the equiaxe...

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Abstract

The invention provides a NiCoCr-based medium-entropy alloy with excellent strength-plasticity matching and a preparation method thereof, which uses Al and Ta elements for microalloying treatment, and the alloy can obtain excellent strength-plasticity combination after a simple deformation heat treatment process; Alloying Al / Ta elements in the present invention not only reduces the grain size and increases the twin content, but also produces a significant solid solution strengthening effect, which greatly improves the lattice friction, but the alloy still maintains the fcc matrix, so that the alloy While improving the strength, it still has good toughness. The alloy of the invention has excellent mechanical properties at room temperature, increases the yield strength of the NiCoCr medium entropy alloy by 106% to about 635MPa, and increases the tensile strength by 35% to about 1000MPa, and simultaneously has 52% tensile ductility. Based on the above characteristics, the alloy of the present invention has great competitive advantages in single-phase fcc high / medium entropy alloys, and 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 NiCoCr-based medium-entropy alloy with excellent strength-plasticity matching and a preparation method thereof. Background technique [0002] For traditional metal materials, it is extremely challenging to design alloys with excellent-strength matching, and the emergence of high / medium entropy alloys (HEAs / MEAs) provides infinite possibilities for realizing this goal. HEAs were first reported in 2004, It is a new type of high-performance metal material that has emerged in recent years 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 propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16
CPCC22C1/02C22C30/00C22F1/16
Inventor 张金钰张东东刘刚孙军
Owner XI AN JIAOTONG UNIV
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