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A kind of medium entropy alloy and preparation method thereof

An entropy alloy and alloy ingot technology, applied in the field of medium-entropy alloy and its preparation, can solve the problems of limited strengthening effect of high-entropy alloy, and achieve the effects of improved mechanical properties, convenient acquisition and good safety.

Active Publication Date: 2022-04-08
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Replacement solid solution strengthening is a common strengthening and toughening method in high-entropy alloys, but the characteristics of multi-principal components lead to no traditional distinction between solute and solvent in high-entropy alloys, that is, there is no solvent lattice, atomic size difference and modulus mismatch. As a result, the high-entropy alloy crystal has severe and continuous lattice distortion, so the interaction between dislocations and solute atoms will not be as significant as in traditional alloys during the deformation process, so the replacement solid solution strengthening effect on high-entropy alloys is very strong. limited

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  • A kind of medium entropy alloy and preparation method thereof
  • A kind of medium entropy alloy and preparation method thereof
  • A kind of medium entropy alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0051] A medium entropy alloy in this embodiment, according to atomic percentage, B 6%, Cr 30%, Fe 34%, Ni 30%.

[0052] The preparation method of the medium entropy alloy of the present embodiment is as follows:

[0053] (1) According to the proportion of each atom, weigh the elemental B, Cr, Fe, Ni respectively, and the total mass is 80g;

[0054] (2) Use SiC sandpaper and a grinder to remove impurities and oxides on the surface of Cr, Fe, Ni and B elemental metal raw materials with a purity of ≥99.9wt%, then place them in a container, add alcohol, clean them once with ultrasonic waves, and dry them;

[0055] (3) Put the dried metal element in a high-vacuum non-consumable arc melting furnace, under the protection of argon, at a vacuum degree lower than 2.5×10 ﹣3 Carry out alloying smelting under MPa, keep stirring during the smelting process, each smelting time is more than 10min, obtain alloy liquid, cool to obtain alloy ingot, turn over alloy ingot, and repeat smelting m...

Embodiment 2

[0057] A medium entropy alloy in this embodiment, according to the atomic percentage, B 3%, Cr 32.3%, Fe 32.3%, Ni 32.4%.

[0058] The preparation method of the medium entropy alloy of the present embodiment is as follows:

[0059] (1) According to the proportion of each atom, weigh the elemental B, Cr, Fe, Ni respectively, and the total mass is 80g;

[0060] (2) Use SiC sandpaper and a grinder to remove impurities and oxides on the surface of Cr, Fe, Ni and B elemental metal raw materials with a purity of ≥99.9wt%, then place them in a container, add alcohol, clean them twice with ultrasonic waves, and dry them;

[0061] (3) Put the dried metal element in a high-vacuum non-consumable arc melting furnace, under the protection of argon, at a vacuum degree lower than 2.5×10 ﹣3 Carry out alloying smelting under MPa, keep stirring during the smelting process, each smelting time is more than 10min, obtain alloy liquid, cool to obtain alloy ingot, turn over alloy ingot, and repeat...

Embodiment 3

[0063] A medium-entropy alloy in this embodiment, according to atomic percentage, B 1%, Cr 35%, Fe 30%, Ni 34%.

[0064] The preparation method of the medium entropy alloy of the present embodiment is as follows:

[0065] (1) According to the proportion of each atom, weigh the elemental B, Cr, Fe, Ni respectively, and the total mass is 80g;

[0066] (2) Use SiC sandpaper and a grinder to remove impurities and oxides on the surface of Cr, Fe, Ni, and B elemental metal raw materials with a purity of ≥99.9wt%, then place them in a container, add alcohol, and use ultrasonic cleaning for 3 times before drying;

[0067] (3) Put the dried metal element in a high-vacuum non-consumable arc melting furnace, under the protection of argon, at a vacuum degree lower than 2.5×10 ﹣3 Carry out alloying smelting under MPa, keep stirring during the smelting process, each smelting time is more than 10min, obtain alloy liquid, cool to obtain alloy ingot, turn over alloy ingot, and repeat smeltin...

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Abstract

The invention relates to a medium-entropy alloy and a preparation method thereof. The medium-entropy alloy includes the following atoms: B, Cr, Fe and Ni; or C, Cr, Fe and Ni. In the present invention, the mechanical properties of the prepared medium-entropy alloy are greatly improved by adding B or C solid-solution strengthening elements through the interstitial solid-solution strengthening mechanism, and the interstitial solid-solution elements such as B or C are cheap, and do not need to add expensive Co elements. The prepared medium entropy alloy has excellent mechanical properties, thereby improving the performance of the alloy, and the preparation method of the invention is simple, and the selected matrix elements are non-toxic and easy to obtain, with good safety and high economic value.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a medium-entropy alloy and a preparation method thereof. Background technique [0002] Multi-principal alloys refer to alloys containing multiple main constituent elements, including high-entropy alloys and medium-entropy alloys. Compared with traditional single-principal alloys, high-entropy and medium-entropy multi-principal alloys are easier to form a simple solid solution structure, and have excellent mechanical, physical and chemical properties, such as high strength and hardness, high corrosion resistance Resistance, excellent wear resistance and good magnetic properties and so on. These excellent properties make high-entropy and medium-entropy alloys have a very broad application space in the fields of aviation, aerospace, navigation, machinery and microelectronics. [0003] High-entropy alloy, referred to as HEA, has changed the design concept of tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02
Inventor 马丽莉杨柏婷朱子义
Owner QINGHAI UNIVERSITY