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Coherent nanophase-reinforced medium-entropy alloy with excellent thermal stability and preparation method of coherent nanophase-reinforced medium-entropy alloy

A technology of thermal stability and entropy alloy, which is applied in the field of excellent thermal stability coherent nano-phase strengthened medium-entropy alloy and its preparation, can solve the problem of low thermal stability of nano-phase, achieve excellent thermal stability of the structure, and facilitate creep and long-lasting, reduced tendency to form effects

Pending Publication Date: 2022-07-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the relatively low thermal stability of traditional superalloy nanophases, the present invention provides a coherent nanophase-strengthened medium-entropy alloy with excellent thermal stability and a preparation method to improve the thermal stability of superalloy nanophases

Method used

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  • Coherent nanophase-reinforced medium-entropy alloy with excellent thermal stability and preparation method of coherent nanophase-reinforced medium-entropy alloy
  • Coherent nanophase-reinforced medium-entropy alloy with excellent thermal stability and preparation method of coherent nanophase-reinforced medium-entropy alloy
  • Coherent nanophase-reinforced medium-entropy alloy with excellent thermal stability and preparation method of coherent nanophase-reinforced medium-entropy alloy

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preparation example Construction

[0029] The preparation method of the entropy alloy in the NiCoCr base of the above-mentioned dual-phase structure comprises the following steps:

[0030] Step 1. Mix 30-33% of Ni, 30-33% of Co, 30-33% of Cr, 5-7% of Al and 1.0-3.0% of Ta metal particles in atomic percentage.

[0031] When the raw materials are weighed, the weight is accurate to 0.01g, and then the alloy is smelted by vacuum arc melting.

[0032] Step 2, vacuum smelting the metal particles obtained in step 1 to form an ingot.

[0033] During the smelting process, the vacuum is first to 3Pa, then high-purity argon gas is introduced, and then the vacuum is evacuated. The furnace cleaning is repeated three times to ensure a high-purity vacuum environment. Melted 5 times to ensure the uniformity of composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0034] Step 3, performing homogenization treatment on the ingot obtained in step 2 at a temperature of 1200-1250 °C;

[0035] Ste...

Embodiment 1

[0039] A method for preparing a medium-entropy alloy strengthened by coherent nano-phase with excellent thermal stability, comprising the following steps:

[0040] Step 1. Mix 31% of Ni, 31% of Co, 30% of Cr, 6% of Al and 2% of Ta metal particles in atomic percentage.

[0041] Step 2, vacuum smelting the metal particles obtained in step 1 to form an ingot.

[0042] During the smelting process, the vacuum is first to 3Pa, then high-purity argon gas is introduced, and then the vacuum is evacuated. The furnace cleaning is repeated 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 remelting is repeated 5 times. , in order to ensure the uniformity of composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0043] Step 3. Perform 1200°C homogenization treatment on the alloy ingot;

[0044] Step 4. The homogenized alloy is subjected...

Embodiment 2

[0049] A method for preparing a medium-entropy alloy strengthened by coherent nano-phase with excellent thermal stability, comprising the following steps:

[0050] Step 1. Mix 33% of Ni, 30% of Co, 31% of Cr, 5% of Al and 1% of Ta metal particles in atomic percentage.

[0051] Step 2, vacuum smelting the metal particles obtained in step 1 to form an ingot.

[0052] During the smelting process, the vacuum is first to 3Pa, then high-purity argon gas is introduced, and then the vacuum is evacuated, and the furnace is washed three times to ensure a high-purity vacuum environment. , in order to ensure the uniformity of composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;

[0053] Step 3. The alloy ingot is homogenized at 1225°C;

[0054] Step 4. The homogenized alloy is subjected to multi-pass cold rolling at room temperature, and the deformation is controlled at 70%;

[0055] Step 5: Recrystallization of the cold-rolled alloy at 1075° C. for 15 ...

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Abstract

The invention discloses a coherent nanophase reinforced medium-entropy alloy with excellent thermal stability and a preparation method, the coherent nanophase reinforced medium-entropy alloy comprises 30 at.%-33 at.% of Ni, 30 at.%-33 at.% of Co, 30 at.%-33 at.% of Cr, 5 at.%-7 at.% of Al and 1.0 at.%-3.0 at.% of Ta, gamma'phase is added into the NiCoCr medium-entropy alloy with excellent mechanical properties to form elements Al and Ta, and then a nanophase is introduced into a NiCoCr alloy matrix through an aging process, so that the thermal stability of the alloy is improved. A gamma + gamma'structure similar to a high-temperature alloy is constructed, and meanwhile, the strength of the NiCoCr alloy is also greatly improved through the nano precipitation strengthening effect; the alloy not only has the characteristic of high toughness, but also has excellent structure thermal stability, so that the alloy has great competitive advantages in alloys with similar structures, has great engineering application prospects in the high-temperature field, and is expected to become a next-generation high-temperature structural material.

Description

technical field [0001] The invention relates to the technical field of high-performance alloy materials, in particular to a coherent nano-phase reinforced medium-entropy alloy with excellent thermal stability and a preparation method. Background technique [0002] Traditional Ni-based superalloys are a class of high-performance metal structural materials for high-temperature service environments, and they are widely used in nuclear power, aerospace and other fields. The microstructure of Ni-based superalloy is a γ+γ' dual-phase structure, and its special structure endows it with excellent high-temperature mechanical properties, such as creep, fatigue and long-lasting life. Among them, the coarsening behavior of nano-coherent γ' phase directly affects the high-temperature mechanical properties of superalloys, and its coarsening during service will lead to serious degradation of material properties. In fact, the diffusion behavior of alloying elements dominates the coarsening...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C30/00C22C19/07C22C19/058C22C1/02C22C1/023C22F1/10
Inventor 张金钰张东东刘刚孙军
Owner XI AN JIAOTONG UNIV
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