High-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy and preparation method thereof

A high-entropy alloy, high-strength and high-toughness technology, which is applied in the field of metal materials and its preparation, can solve the problems of poor plasticity matching of high-entropy alloys, and achieve the effects of excellent plasticity and toughness, uniform structure, and low price

Active Publication Date: 2020-10-02
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of poor plasticity matching of existing high-entropy alloys, the present invention provides a high-strength, high-toughness, corrosion-resistant, cobalt-free high-entropy alloy

Method used

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  • High-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy and preparation method thereof
  • High-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy and preparation method thereof
  • High-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-strength, high-toughness, corrosion-resistant, cobalt-free high-entropy alloy Fe 30 Ni 30 Cr 15 mn 10 Al 15

[0037] Step 1. Metal particles of five elements including Fe, Ni, Cr, Mn and Al are selected as raw materials, and the purity of all metal raw materials is greater than 99.9wt.%.

[0038] Step 2, the molar ratio of Fe: Ni: Cr: Mn: Al of the alloy is 30%: 30%: 15%: 10%: 15%, according to the naming characteristics of high-entropy alloys, the atomic molar ratio of each element The percentages converted into the percentages of the mass of each element in the total mass of the alloy are wt(Fe)=32.40%, wt(Ni)=34.05%, wt(Cr)=15.08%, wt(Mn)=10.63%, wt(Al) =7.84%, and the ingredients of each element are carried out based on the total mass of the prepared alloy.

[0039] Step 3, using a combination of mechanical and chemical methods to remove the surface oxide scales of the raw material metals Fe, Ni, Cr, Mn, Al, and cleaning, drying for later use, that is, ...

Embodiment 2

[0046] A high-strength, high-toughness, corrosion-resistant, cobalt-free high-entropy alloy Fe 27.5 Ni 27.5 Cr 15 mn 10 Al 20

[0047] Step 1. Metal particles of five elements including Fe, Ni, Cr, Mn and Al are selected as raw materials, and the purity of all metal raw materials is greater than 99.9wt.%.

[0048] Step 2, the molar ratio of Fe: Ni: Cr: Mn: Al of the alloy is 27.5%: 27.5%: 15%: 10%: 20%, according to the naming characteristics of high-entropy alloys, the atomic moles of each element The percentages converted into the mass of each element in the total mass of the alloy are wt(Fe)=30.60%, wt(Ni)=32.16%, wt(Cr)=15.54%, wt(Mn)=10.95%, wt(Al) =10.75%, and the ingredients of each element are carried out based on the total mass of the prepared alloy.

[0049] Step 3, using a combination of mechanical and chemical methods to remove the surface oxide scales of the raw material metals Fe, Ni, Cr, Mn, Al, and cleaning, drying for later use, that is, using sandpaper ...

Embodiment 3

[0056] A high-strength, high-toughness, corrosion-resistant, cobalt-free high-entropy alloy Fe 32.5 Ni 32.5 Cr 15 mn 10 al 10

[0057] Step 1. Metal particles of five elements including Fe, Ni, Cr, Mn and Al are selected as raw materials, and the purity of all metal raw materials is greater than 99.9wt.%.

[0058] Step 2, the molar ratio of Fe: Ni: Cr: Mn: Al of the alloy is 32.5%: 32.5%: 15%: 10%: 10%, according to the naming characteristics of high-entropy alloys, the atomic moles of each element The percentages converted into the percentages of the mass of each element in the total mass of the alloy are wt(Fe)=34.11%, wt(Ni)=35.84%, wt(Cr)=14.66%, wt(Mn)=10.32%, wt(Al) =5.07%, and the ingredients of each element are carried out based on the total mass of the prepared alloy.

[0059] Step 3, using a combination of mechanical and chemical methods to remove the surface oxide scales of the raw material metals Fe, Ni, Cr, Mn, Al, and cleaning, drying for later use, that is...

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Abstract

The invention discloses high-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy and a preparation method thereof. In the high-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy, the atomic percent of Fe: Ni: Cr: Mn: Al is 30-27.5% : 30-27.5% : 15% : 10% : 15-20%. A preparation technology of the high-strength, high-toughness and anti-corrosion cobalt-free high-entropy alloy comprises the following steps: selecting the five elements including Fe, Ni, Cr, Mn and Al with the purity of each being 99.9wt% as the raw material for batching, and utilizinga non self-consuming electric arc furnace to prepare the high-entropy alloy through smelting. The high-entropy alloy is uniform in texture, shows excellent comprehensive mechanical property, does notcontain the expensive Co element and is low in price. The yield strength of the high-entropy alloy is equal to or greater than 770MPa, the breaking strain is equal to or greater than 45%, the corrosion resistance of the high-entropy alloy to 3.5wt.% NaCl is better than the corrosion resistance of stainless steel SUS 304 to 3.5wt.% NaCl, and the application prospect is broad.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, and provides a high-strength, high-toughness, corrosion-resistant, cobalt-free high-entropy alloy. Background technique [0002] High-entropy alloys are new materials based on the development of "chemical disorder". It mainly proposes the development and research of alloy materials from the perspective of entropy, breaking through the limitations of alloy material elements in the past. High-entropy alloys are generally composed of five or more metals or nonmetals in equal or near-equal atomic ratios. In order to explore a broader field, scholars have extended the definition of high-entropy alloys to the extent that the proportion of each principal element in the alloy can be between 5 at.% and 35 at.%. Different from traditional alloys, multi-principal element high-entropy alloys are the result of the joint action of multiple principal elements, rather than a single element t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02C22C19/058C22C38/58C22C38/06C22C1/023C22C33/04
Inventor 叶喜葱李哲徐维权方东徐东张文
Owner CHINA THREE GORGES UNIV
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