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High-entropy alloy surface carburizing modification method

A technology of high-entropy alloy and surface carburizing, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc. Diffusion rate of elements and other issues to achieve the effect of increasing surface hardness, improving high temperature oxidation resistance, and good bonding

Active Publication Date: 2018-04-24
NAT UNIV OF DEFENSE TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

(2) Lattice distortion effect, due to the difference in atomic radius between elements, causes lattice distortion, affects the physical and chemical properties of the alloy; leads to solid solution strengthening, affects the electrical conductivity, magnetism, thermal conductivity, etc. of the alloy
(3) Diffusion hysteresis effect, the synergistic diffusion between various elements is very difficult, and severe lattice distortion will slow down the diffusion rate of elements, so the phase separation is very slow at high temperature, and even inhibited and delayed to low temperature
This research also involves the high-temperature oxidation resistance of the material, but the oxidation assessment condition is 800°C for 40 hours, which is far from the expectation of using high-entropy alloy materials for superalloy materials.

Method used

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Embodiment 1

[0034] A method for carburizing and modifying the surface of a high-entropy alloy according to the present invention. The composition of the high-entropy alloy is HfZrTiTa, and the atomic molar ratio of each component Hf, Zr, Ti, and Ta is 1:1:1:1. When preparing the high-entropy alloy, the purity of the selected raw materials of Hf, Zr, Ti and Ta is not less than 99%, preferably 99%-99.99%. The selected carburizing agent is activated carbon powder of analytical purity and above.

[0035] A method for surface carburizing modification of a high-entropy alloy of the present invention, comprising the steps of:

[0036](1) Pretreatment of the HfZrTiTa high-entropy alloy raw material: the sample was cut into a rod-shaped sample of 1×1×15 mm by wire cutting, and the surface of the rod-shaped sample was polished with sandpaper until the metallic luster was exposed and the surface was smooth. The rod-shaped samples after grinding were ultrasonically cleaned with alcohol, and then dri...

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Abstract

The invention discloses a high-entropy alloy surface carburizing modification method. The method comprises the steps that (1), an HfZrTiTa high-entropy alloy is pre-treated; (2), active carbon is selected as a carburizing agent, a carburizing container is naturally filled with the carburizing agent, and the pre-treated HfZrTiTa high-entropy alloy is buried into the upper middle portion of the carburizing agent; (3), the carburizing container is sealed; and (4), the sealed carburizing container is placed into a heating device, heating is conducted till the temperature is 700-900 DEG C, then heat preservation is conducted for 2-10 h, after treatment is finished, the carburizing container is taken out for air cooling, then a sample subjected to carburizing treatment is taken out to be subjected to ultrasonic washing and drying, and a high-entropy alloy with the surface subjected to carburizing modification is obtained. According to the high-entropy alloy surface carburizing modification method, the surface hardness and the high-temperature oxidation resistance of the HfZrTiTa high-entropy alloy can be effectively improved at the same time.

Description

technical field [0001] The invention belongs to the field of coating preparation, relates to the field of multi-principal element high-entropy alloy materials, and particularly relates to a method for carburizing and modifying the surface of high-entropy alloys. Background technique [0002] High-entropy alloy refers to a new type of alloy that contains 5 to 13 alloying elements, each element content is between 5% and 35%, and can form a high-entropy solid solution. There are no alloy elements with a content of more than 50% in high-entropy alloys, and there is no distinction between major elements and minor elements in the entire alloy system. The study found that the high-entropy alloy system reflects a multi-component collective effect, which has the characteristics of high strength, high hardness, and high wear resistance. Due to the special combination of various metal elements, high-entropy alloys exhibit four major effects: (1) High-entropy effects, alloys will form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/64
CPCC23C8/64
Inventor 朱利安叶益聪白书欣唐宇李顺张虹艾园林
Owner NAT UNIV OF DEFENSE TECH
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