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Preparation method of high-strength and high-toughness high-entropy alloy

A high-entropy alloy, high-strength and toughness technology, which is applied in the field of high-strength and toughness high-entropy alloy preparation, can solve the problems of unstable structure and uneven composition of high-entropy alloy, and achieve fine microstructure, excellent strength and plastic fit, and stable structure Effect

Active Publication Date: 2021-07-16
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-isoatomic FeMnCoCrC high-entropy alloy containing C prepared by the invention has excellent strength and plastic bonding, and at the same time improves the problems of uneven composition and unstable structure of the high-entropy alloy prepared by the traditional process

Method used

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  • Preparation method of high-strength and high-toughness high-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-strength and ductile high-entropy alloy, the composition of which is the following atomic percentages of metal elements: Fe49.5%, Mn30%, Co10%, Cr10%, C0.5%, which can be expressed as Fe 49.5 mn 30 co 10 Cr 10 C0.5 .

[0036] The first step: configure the high-entropy alloy of the above composition and n-heptane accounting for 10% of the total powder mass in a glove box filled with Ar gas, put it into a ball mill jar and seal it.

[0037] Step 2: Put the sealed ball mill jar into a high-energy planetary ball mill for mechanical alloying. Use stainless steel balls and stainless steel tanks, the ratio of balls to materials is 15:1, the rotation speed is 300r / min, and the ball milling time is 32h.

[0038] The third step: put the powder obtained in the second step into a vacuum drying oven to dry at a temperature of 100° C., and keep it warm for 20 hours to remove n-heptane to obtain a high-entropy alloy powder.

[0039] Step 4: Put the high-entropy alloy powde...

Embodiment 2

[0045] A high-strength and toughness high-entropy alloy, the composition of which is the following atomic percentage of metal element: Fe49.6%, Mn27.4%, Co11.6%, Cr10.8%, C0.6%, can be expressed as Fe 49.6 mn 27.4 co 11.6 Cr 10.8 C 0.6 .

[0046] The first step: configure the high-entropy alloy powder of the above composition and n-heptane accounting for 10% of the total mass of the powder in a glove box filled with Ar gas, put it into a ball mill jar and seal it.

[0047] Step 2: Put the sealed ball mill jar into a high-energy planetary ball mill for mechanical alloying. Use stainless steel balls and stainless steel tanks, the ball-to-material ratio is 20:1, the rotating speed is 280r / min, and the ball milling time is 34h.

[0048] The third step: put the powder obtained in the second step into a vacuum drying oven to dry at a temperature of 100° C., and keep it warm for 20 hours to remove n-heptane to obtain a high-entropy alloy powder.

[0049] Step 4: Put the high-en...

Embodiment 3

[0055] A high-entropy alloy with high strength and toughness, the composition is the following atomic percentage of metal element: Fe49.7%, Mn29.6%, Co9.6%, Cr10.2%, C0.9%, which can be expressed as Fe 49.7 mn 29.6 co 9.6 Cr 10.2 C 0.9 .

[0056] The first step: configure the high-entropy alloy powder of the above composition and n-heptane accounting for 10% of the total mass of the powder in a glove box filled with Ar gas, put it into a ball mill jar and seal it.

[0057] Step 2: Put the sealed ball mill jar into a high-energy planetary ball mill for mechanical alloying. Use stainless steel balls and stainless steel tanks, the ball-to-material ratio is 20:1, the rotating speed is 300r / min, and the ball milling time is 35h.

[0058] The third step: put the powder obtained in the second step into a vacuum drying oven to dry at a temperature of 100° C., and keep it warm for 20 hours to remove n-heptane to obtain a high-entropy alloy powder.

[0059] Step 4: Put the high-en...

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Abstract

The invention discloses a preparation method of a high-strength and high-toughness high-entropy alloy, and relates to the technical field of alloy material production. The preparation method comprises the following specific steps that high-entropy alloy powder prepared from the components in atomic percent: 27%-30% of Mn, 8%-12% of Co, 8%-12% of Cr, 0.4%-1.3% of C and the balance of Fe is prepared; the high-entropy alloy powder is subjected to ball milling treatment and then pre-pressed, the pressure ranges from 300 MPa to 500 MPa, the pressure is maintained for 200 seconds to 300 seconds, and a pre-pressed block of the high-entropy alloy is obtained; the pre-pressing block is subjected to vacuum annealing, vacuum hot pressing sintering and cold rolling deformation; and the high-entropy alloy sheet subjected to cold rolling deformation is subjected to constraint carbon distribution treatment at the temperature of 400-550 DEG C, and free carbon elements are diffused. The C-containing unequal-atom FeMnCoCrC high-entropy alloy prepared through the method has excellent strength and plasticity combination, and meanwhile, the problems that a high-entropy alloy prepared through a traditional technology is uneven in component and unstable in structure are solved.

Description

technical field [0001] The invention belongs to the technical field of alloy material production, and in particular relates to a method for preparing a high-strength toughness high-entropy alloy. Background technique [0002] High-entropy alloys were originally considered to be composed of five or more principal elements in an equiatomic or nearly equiatomic ratio. Later, with further research, this definition was extended to non-equatomic ratio alloys and could be obtained by adding some trace elements To adjust the structure and properties of high-entropy alloys, the content of these trace elements generally does not exceed 5%. Due to the high mixing entropy of high-entropy alloys, the formation of intermetallic compounds is inhibited, so alloys generally tend to form solid solution phases with simple FCC, BCC and HCP crystal structures, which makes high-entropy alloys exhibit some unique physical and chemical properties. chemical properties. In some cases, the addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C38/58C22C38/52C22C1/04C22C33/02B22F9/04B22F3/14B22F3/18B22F3/24
CPCC22C30/00C22C38/58C22C38/52C22C1/04C22C33/0285B22F9/04B22F3/14B22F3/18B22F3/24B22F2009/043B22F2009/041B22F2003/248
Inventor 刘和平杨恒喆刘浪浪孙凤儿
Owner ZHONGBEI UNIV
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