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Ultra-fine grain high-strength high-entropy alloy with magnetism and preparing method of ultra-fine grain high-strength high-entropy alloy

A high-entropy alloy and high-strength technology, applied in the field of high-entropy alloys, to achieve good comprehensive mechanical properties, low forming temperature, and uniform composition

Inactive Publication Date: 2020-05-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports in the existing literature on the preparation of magnetic high-entropy alloys by powder metallurgy

Method used

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  • Ultra-fine grain high-strength high-entropy alloy with magnetism and preparing method of ultra-fine grain high-strength high-entropy alloy
  • Ultra-fine grain high-strength high-entropy alloy with magnetism and preparing method of ultra-fine grain high-strength high-entropy alloy
  • Ultra-fine grain high-strength high-entropy alloy with magnetism and preparing method of ultra-fine grain high-strength high-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A magnetic high-strength ultrafine grain (Fe 50 mn 30 Cr 10 co 10 ) 100-X al X High-entropy alloys, the composition of which is (Fe 50 mn 30 Cr 10 co 10 ) 84 al 16 , the specific steps of the method are as follows:

[0031] Step 1: Mix the powder

[0032] Weigh the elemental powder according to the atomic percentage content of Fe 42%, Mn 25.2%, Cr 8.4%, Co 8.4%, Al 16%, the powder purity is 99.99wt%, and the particle size is less than 325 mesh. The weighed powder was placed in a V-type powder mixer for dry mixing for 16 hours.

[0033] Step 2: Mechanical Alloying

[0034] Put the uniformly mixed powder into a ball mill jar, and then use a planetary ball mill for ball milling. The main ball milling parameters are controlled as follows:

[0035] Atmosphere control: Before the ball milling starts, the ball mill tank is evacuated and filled with argon for protection;

[0036] Ball material ratio: 20:1;

[0037] Ball mill speed: 300rpm;

[0038] Ball milling...

Embodiment 2

[0049] A magnetic high-strength ultrafine grain (Fe 50 mn 30 Cr 10 co 10 ) 100-X Al X High-entropy alloys, the composition of which is (Fe 50 mn 30 Cr 10 co 10 ) 80 Al 20 , the specific steps of the method are as follows:

[0050] Step 1: Mix the powder

[0051] Weigh the elemental powder according to the atomic percentage content of Fe 40%, Mn 24%, Cr 8%, Co 8%, Al 20%, the powder purity is 99.99wt%, and the particle size is less than 325 mesh. The weighed powder was placed in a V-type powder mixer for dry mixing for 20 h.

[0052] Step 2: Mechanical Alloying

[0053] Put the uniformly mixed powder into a ball mill jar, and then use a planetary ball mill for ball milling. The main ball milling parameters are controlled as follows:

[0054] Atmosphere control: Before the ball milling starts, the ball mill tank is evacuated and filled with argon for protection;

[0055] Ball material ratio: 15:1;

[0056] Ball mill speed: 200rpm;

[0057] Ball milling time: 50h...

Embodiment 3

[0068] A magnetic high-strength ultrafine grain (Fe 50 mn 30 Cr 10 co 10 ) 100-X Al X High-entropy alloys, the composition of which is (Fe 50 mn 30 Cr 10 co 10 ) 88 Al 12 , the specific steps of the method are as follows:

[0069] Step 1: Mix the powder

[0070] Weigh the elemental powder according to the atomic percentage content of Fe 44%, Mn 26.4%, Cr 8.8%, Co 8.8%, Al 12%, the powder purity is 99.99wt%, and the particle size is less than 325 mesh. The weighed powder was placed in a V-type powder mixer for dry mixing for 24 hours.

[0071] Step 2: Mechanical Alloying

[0072] Put the uniformly mixed powder into a ball mill jar, and then use a planetary ball mill for ball milling. The main ball milling parameters are controlled as follows:

[0073] Atmosphere control: Before the ball milling starts, the ball mill tank is evacuated and filled with argon for protection;

[0074] Ball material ratio: 10:1;

[0075] Ball mill speed: 250rpm;

[0076] Ball milling...

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Abstract

The invention belongs to the technical field of high-entropy alloys, and discloses an ultra-fine grain high-strength high-entropy alloy with magnetism and a preparing method of the ultra-fine grain high-strength high-entropy alloy. The preparing method of the high-entropy alloy is further provided, and in other words, a mechanical alloying and spark plasma sintering combined method is provided. The structure of the high-entropy alloy is a BCC+FCC double-phase structure or BCC single-phase structure, wherein the average grain size of the BCC phase is about 200-500 nm, the average grain size ofthe FCC phase is about 400-600 nm, and good comprehensive mechanical performance and magnetic performance are achieved. When the content of Al is 16%, the room-temperature compression yield strength of the Al is 1916 MPa, the plasticity strain capacity during fracture is 11.48%, the maximum compressive strength is 2379 MPa, hardness is 614 Hv, the saturation magnetization strength is 83.07 Am<2> / Kg, and the coercive force is 1238.39 A / m.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to a magnetic ultrafine-grain high-strength high-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloys (HEAs) are a class of alloys that are alloyed by five or more elements in a certain atomic ratio or near-equal atomic ratio to form a high-entropy solid solution phase. High-entropy alloys are a new type of multi-principal alloys that have emerged in recent years. Compared with traditional alloys, they have excellent comprehensive properties. This is mainly due to its special structure. The most typical structure of high-entropy alloys is a multi-principal solid solution. Due to its extremely strong solid solution strengthening effect, it will significantly increase the strength and hardness of the alloy. Sometimes a small amount of ordered phase, nano The presence of crystalline and amorphous phases will further increase the...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C33/02B22F9/04B22F1/00B22F3/105
CPCC22C30/00C22C38/38C22C38/30C22C38/06C22C33/0207C22C33/0285B22F9/04B22F3/105B22F2009/043B22F2003/1051B22F1/05
Inventor 龙雁彭亮张伟华李贵琦彭海燕
Owner SOUTH CHINA UNIV OF TECH
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