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A kind of high-entropy alloy reinforced by ceramic particles and its preparation method

A technology of high-entropy alloys and ceramic particles, which is applied in the field of high-entropy alloys reinforced by ceramic particles and its preparation, can solve the problems of difficult uniform distribution of metal solutions, high toxicity of chemical reagents, and high environmental protection requirements, so as to reduce brittle fracture The possibility of occurrence, low cost, and the effect of improving comprehensive mechanical properties

Active Publication Date: 2020-07-28
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Adding ceramic particles to the interior of high-entropy alloy grains can be achieved by smelting, but due to the characteristics of small density, light weight and high melting point of ceramic particles, they will float on the surface of the molten metal during the smelting process, and it is difficult to distribute them evenly on the metal Therefore, it is difficult to uniformly distribute the ceramic particle reinforcement phase in the high-entropy alloy crystal through the traditional smelting method.
[0003] Mechanical alloying can also dope ceramic particles into high-entropy alloy grains, but the workload is heavy and the cost is too high for workpieces with high raw material requirements
Solid-liquid doping is the use of chemical methods to dope ceramic particles into the high-entropy alloy matrix. Compared with solid-solid doping, the cost is lower and it is easier to achieve large-scale production. However, due to the toxicity of chemical reagents, the requirements for environmental protection are relatively high. high

Method used

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  • A kind of high-entropy alloy reinforced by ceramic particles and its preparation method
  • A kind of high-entropy alloy reinforced by ceramic particles and its preparation method
  • A kind of high-entropy alloy reinforced by ceramic particles and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Take alumina particles with a particle size of 20-30um, FeMnCoCr high-entropy alloy powder with a particle size of 80-100um and an atomic ratio of 4:4:1:1, the weight ratio of the two is 0.5wt.%; take 5 The % high-entropy alloy powder is ball-milled with alumina particles as the first part, and the ball-milling parameters are as follows: the ball-to-material ratio is 2:1, the rotating speed is 200rpm, and the ball-milling time is 2h to obtain high-entropy-ceramic alloy powder;

[0034] 2) uniformly mixing the high-entropy-ceramic alloy powder and the remaining high-entropy powder for 40 minutes to obtain a mixed powder;

[0035] 3) Prepress the mixed powder under a pressure of 400Mpa to obtain a prepress;

[0036] 4) Put the prepress in N with a volume ratio of 9:1 2 and H 2 In the atmosphere, sintering is carried out at 1000 ° C, and naturally cooled after sintering.

[0037] see Figure 2a , Figure 2b , Figure 2a and Figure 2b They are the SEM image and t...

Embodiment 2

[0040] 1) Take ZrO with a particle size of 10-20um 2 Particles, FeMnCoCr high-entropy alloy powder with a particle size of 60-80um and an atomic ratio of 5:3:1:1, the weight ratio of the two is 0.3wt.%; take 7% high-entropy alloy powder as the first part and ZrO 2 Carry out ball milling, and the ball milling parameters are as follows: the ball-to-material ratio is 2:1, the rotating speed is 300rpm, and the ball milling time is 1.5h to obtain high-entropy-ceramic alloy powder;

[0041] 2) uniformly mixing the high-entropy-ceramic alloy powder and the remaining high-entropy powder for 30 minutes to obtain a mixed powder;

[0042] 3) prepress the mixed powder under a pressure of 500Mpa to obtain a prepress;

[0043] 4) Put the pre-pressed part at a volume ratio of 19:1 N 2 and H 2 In the atmosphere, sintering is carried out at 1050°C, and it is naturally cooled after sintering.

Embodiment 3

[0045] 1) Take SiC particles with a particle size of 10-15um, FeMnCoCr high-entropy alloy powder with a particle size of 40-60um and an atomic ratio of 1:1:1:1, the weight ratio of the two is 0.1wt.%; take 10% The high-entropy alloy powder is used as the first part to perform ball milling with SiC particles. The ball-milling parameters are as follows: the ball-to-material ratio is 2:1, the rotating speed is 400rpm, and the ball-milling time is 1h to obtain high-entropy-ceramic alloy powder;

[0046] 2) uniformly mixing the high-entropy-ceramic alloy powder and the remaining high-entropy powder for 25 minutes to obtain a mixed powder;

[0047] 3) Prepress the mixed powder under a pressure of 600Mpa to obtain a prepress;

[0048] 4) Put the prepress in 19:1 Ar and H 2 In the atmosphere, sintering is carried out at 1050°C, and it is naturally cooled after sintering.

[0049] Other embodiments provided by the present invention are shown in Table 1:

[0050] Table 1 is the detaile...

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Abstract

The invention discloses a preparation method of a ceramic particle reinforced high-entropy alloy. The preparation method comprises the following steps that (1), ceramic particles and a high-entropy alloy are weighed, wherein the ceramic particles account for 0.1-0.5 wt.% of the sum of weights of high-entropy alloy powder and the ceramic particles, and the ceramic particles serve as alloy elementsto conduct ball milling with a first part of the high-entropy alloy to obtain high-entropy-ceramic alloy powder, wherein the first part of the high-entropy alloy accounts for 5-10% of the total weight; (2) the high-entropy-ceramic alloy powder and remaining high-entropy alloy powder are mixed; (3) the mixed powder is cold-pressed to be formed, and a pre-pressed part is obtained; and (4) the pre-pressed part is sintered at a high temperature, the grain boundary of the high-entropy alloy is migrated, thus the ceramic particles are wrapped, and natural cooling is conducted after sintering. The preparation method is less in consumed time and low in cost, the ceramic particles in the grain boundary of the high-entropy alloy are reduced, and thus the possibility of brittle fracture is decreased.According to the ceramic particle reinforced high-entropy alloy, the comprehensive mechanical properties of the high-entropy alloy are improved.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a high-entropy alloy reinforced by ceramic particles and a preparation method thereof. Background technique [0002] Adding ceramic particles to the interior of high-entropy alloy grains can be achieved by smelting, but due to the characteristics of small density, light weight and high melting point of ceramic particles, they will float on the surface of the molten metal during the smelting process, and it is difficult to distribute them evenly on the metal Therefore, it is difficult to uniformly distribute the ceramic particle reinforcement phase in the high-entropy alloy crystal through the traditional melting method. [0003] Mechanical alloying can also dope ceramic particles into high-entropy alloy grains, but the workload is large and the cost is too high for workpieces with high demand for raw materials. Solid-liquid doping is the use of chemical methods to dope ceramic par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/05C22C1/10
CPCC22C1/05C22C30/00
Inventor 江峰王邃王华磊王琪孙军张冰清田谨
Owner XI AN JIAOTONG UNIV
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