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Rare-earth-Gd-containing ultra-fine-grain high-toughness high-entropy alloy and preparation method thereof

A technology of high-entropy alloy and ultra-fine grain, which is applied in the field of high-entropy alloy to achieve the effects of controlling adverse effects, less energy consumption, and low forming temperature

Active Publication Date: 2019-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the powder metallurgy method (MA+SPS), and on the basis of the existing CoCrFeMnNi high-entropy alloy system, a small amount of rare earth element Gd is added to achieve the purpose of regulating the structure and improving the strength. So far, there is no relevant literature report

Method used

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  • Rare-earth-Gd-containing ultra-fine-grain high-toughness high-entropy alloy and preparation method thereof
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Embodiment 1

[0037] A method for preparing an ultra-fine-grained high-strength and high-entropy alloy containing rare earth Gd, which adopts the method of combining mechanical alloying and spark plasma sintering technology, and includes the following steps and process conditions:

[0038] Step 1: Mix the powder

[0039] According to the atomic ratio of Co 19.8%, Cr 19.8%, Fe 19.8%, Mn 19.8%, Ni 19.8%, Gd1%, weigh the elemental powder, and then dry mix it in a powder mixer for 12-24 hours until uniform, and the purity of the powder is high at 99.5%;

[0040] Step 2: Prepare alloy powder by mechanical alloying method

[0041]Put the uniformly mixed powder into a ball milling tank, and then perform ball milling on a planetary high-energy ball mill until the alloy powder with a single-phase FCC structure is obtained; the material of the tank body and the balls are made of stainless steel, and the tank is vacuumed and filled with High-purity argon (99.99%) was used as a protective atmosphere;...

Embodiment 2

[0053] A preparation method of an ultra-fine-grained high-strength toughness high-entropy alloy containing rare earth Gd, which adopts the method of combining mechanical alloying and spark plasma sintering technology, and includes the following steps and process conditions:

[0054] Step 1: Mix the powder

[0055] According to the atomic ratio of Co 19.6%, Cr 19.6%, Fe 19.6%, Mn 19.6%, Ni 19.6%, Gd2%, weigh the elemental powder, and then dry mix it in a powder mixer for 12-24 hours until uniform, and the powder purity is high at 99.5%;

[0056] Step 2: Prepare alloy powder by mechanical alloying method

[0057] Put the uniformly mixed powder into a ball milling tank, and then perform ball milling on a planetary high-energy ball mill until the alloy powder with a single-phase FCC structure is obtained; the material of the tank body and the balls are made of stainless steel, and the tank is vacuumed and filled with High-purity argon (99.99%) was used as the protective atmosphe...

Embodiment 3

[0069] A preparation method of an ultra-fine-grained high-strength toughness high-entropy alloy containing rare earth Gd, which adopts the method of combining mechanical alloying and spark plasma sintering technology, and includes the following steps and process conditions:

[0070] Step 1: Mix the powder

[0071] According to the atomic ratio of Co 19.4%, Cr 19.4%, Fe 19.4%, Mn 19.4%, Ni 19.4%, Gd3%, weigh the elemental powder, and then dry mix it in a powder mixer for 12-24 hours until uniform, and the powder purity is high at 99.5%;

[0072] Step 2: Prepare alloy powder by mechanical alloying method

[0073] Put the uniformly mixed powder into a ball milling tank, and then perform ball milling on a planetary high-energy ball mill until the alloy powder with a single-phase FCC structure is obtained; the material of the tank body and the balls are made of stainless steel, and the tank is vacuumed and filled with High-purity argon (99.99%) was used as the protective atmosphe...

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Abstract

The invention belongs to the technical field of high-entropy alloys, and discloses a rare-earth-Gd-containing ultra-fine-grain high-toughness CoCrFeMnNiGdx high-entropy alloy and a preparation methodthereof. The high-entropy alloy comprises the following element atoms of, in percentage by mass, 18%-20% of Co, 18%-20% of Cr, 19%-22% of Fe, 19%-22% of Mn, 18%-22% of Ni and 1%-3% of Gd. The invention further provides the preparation method of the high-entropy alloy, and mechanical alloying and spark plasma sintering are combined. According to the high-entropy alloy and the preparation method, rare earth element Gd is added, the adverse effect of impurity oxygen introduced in the preparation process is controlled, strengthening phase is precipitated out, and the grain is refined by combiningwith a powder metallurgy preparation process, so that the high-entropy alloy has quite excellent comprehensive mechanical properties; and the optimal room-temperature compression yield strength reaches 1621 MPa, the plasticity strain is 35.4%, and the maximum compressive strength is 2685 MPa.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to an ultra-fine-grained high-strength CoCrFeMnNiGd containing rare earth Gd x High-entropy alloys and methods for their preparation. Background technique [0002] As a new type of structural and functional materials, high-entropy alloys have attracted a lot of attention since they were proposed. Because of its unique design concept, the high-entropy alloy has a special structure and excellent performance. High-entropy alloys can generally be defined as five or more elements that are alloyed according to an equiatomic ratio or close to an equiatomic ratio, and tend to form a single-phase solid solution alloy. However, the current research on high-entropy alloys is not limited to this, and there are no strict requirements for element types and atomic ratios. Because of the special structure, high-entropy alloys often exhibit excellent properties different from traditio...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/04B22F9/04B22F3/105
CPCB22F3/105B22F9/04B22F2009/043C22C1/04C22C30/00
Inventor 龙雁张伟华彭亮李贵琦彭海燕
Owner SOUTH CHINA UNIV OF TECH