Preparation method for high-entropy alloy

A technology of high-entropy alloys and alloying elements, applied in the field of preparation of high-entropy alloys, can solve problems that have not been reported, and achieve the effects of avoiding pollution, high reliability, and short sintering time

Inactive Publication Date: 2017-09-05
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, SPS technology has been widely used in the preparation of metal materials, ceramic materials, composite materials, functional materials, amorphous alloys and nano-bulk materials. None reported at home and abroad

Method used

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  • Preparation method for high-entropy alloy
  • Preparation method for high-entropy alloy
  • Preparation method for high-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Adopt the method disclosed in the present invention to prepare high-entropy alloy AlCoCrFeNi, concrete steps are as follows:

[0029] (1) Measure pure Al powder, Co powder, Cr powder, Fe powder and Ni powder according to the converted mass percentage, the particle size of each powder should be less than 70 μm, and the purity should be greater than 99.5%;

[0030] (2) Put the powder into a polymer ball mill tank, put stainless steel balls into it, the ball-to-material ratio is 2:1, mix in a planetary ball mill, the speed of the ball mill is 150 r / min, and the powder has been mixed evenly after 4 hours of mixing , put the powder into the graphite mold after taking it out, and press it tightly;

[0031] (3) Put the graphite mold filled with powder into the SPS sintering equipment for vacuum hot pressing sintering. The pulse cycle of the SPS equipment is set to 36 ms on and 6 ms off. At the beginning of sintering, a pre-pressure of 10 MPa was applied, and heating was starte...

Embodiment 2

[0038] In this example, the high-entropy alloy CoCrFeNiCu will be prepared by the preparation method disclosed in the present invention, and the specific steps are as follows:

[0039] (1) Measure Co powder, Cr powder, Fe powder, Ni powder and Cu powder according to the proportion, the purity of the powder is greater than 99.5%, and the particle size is less than 70 microns;

[0040] (2) Put the powder into a polymer ball mill tank, put stainless steel balls into it, the ball-to-material ratio is 2:1, mix in a planetary ball mill, the speed of the ball mill is 150 r / min, take out the powder after 4 hours of mixing Finally, put it into a graphite mold and press it tightly;

[0041] (3) Put the mold filled with powder raw materials into the SPS sintering equipment for vacuum reaction hot pressing sintering, the pulse mode of the SPS equipment is the same as that of Example 1. At the beginning of sintering, a pre-pressure of 10 MPa was applied, and heating was started when the v...

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Abstract

The invention discloses a preparation method for a high-entropy alloy. A pure element or master alloy powder mixture is adopted as a raw material and is directly put into discharge plasma sintering (SPS) equipment, a vacuum hot pressing reaction is conducted, and the bulk high-entropy alloy is fast sintered and synthesized; and the integration of the densification of the alloy bulk material and the solid solution phase of the high-entropy alloy is achieved through the precise control over the SPS sintering parameters, and the dense high-entropy alloy bulk material is obtained at a time. The high-entropy alloy prepared through the technology is high in densification, uniform in structure and excellent in mechanical performance. The preparation method has the outstanding beneficial effects that the equipment and process are simple, the efficient and fast functions are achieved, the production cost is low, and the reliability is high and is suitable for the industrial production of the high-entropy alloy.

Description

technical field [0001] The invention relates to a simple and reliable preparation method of high-entropy alloys, which belongs to the field of preparation and processing of high-entropy alloys or multi-principal element alloys. Background technique [0002] High-entropy alloys are a new type of alloy system, also known as multi-principal alloys or multi-element alloys, generally composed of a variety of metal (may contain non-metal) elements, and the atomic percentage content of each element is high (5~ 35 at.%), but generally below 50 at.%. Due to the high-entropy effect of mixing multiple elements, the formation of intermetallic compounds is inhibited, and high-entropy alloys generally consist of simple face-centered cubic solid solution (FCC) phases or body-centered cubic solid solution (BCC) phases. Although the high-entropy alloy has a simple phase structure, it has excellent strength, plasticity and toughness, and has special electrical, magnetic and thermal propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/00C23C24/10B22F3/14
CPCC22C1/04B22F3/14B22F2998/10B22F2999/00C22C30/00C23C24/103B22F2202/13B22F2201/20B22F3/02
Inventor 孟军虎张爱军韩杰胜苏博
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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