A kind of homogeneous high-strength cocrni-b medium entropy alloy and preparation method thereof

An entropy alloy and high-strength technology, applied in the field of homogeneous high-strength CoCrNi-B medium-entropy alloy and its preparation, can solve the problems of low mechanical performance index, high cost, and affecting safe service, etc., achieve good strength and toughness index, and reduce melting consumption Energy, the effect of reducing the melting time

Active Publication Date: 2022-03-29
西安慧金科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] First, the composition is difficult to be uniform and the segregation is serious
The prerequisite for multi-principal alloys to fully exert their performance is that several principal components are fully soluble and form a macroscopically homogeneous structure, otherwise the material properties will be seriously affected. In the preparation of medium-entropy alloys in the laboratory, one or more principal components often segregate. Low mechanical performance index, extremely brittle
[0004] Second, the cost is high and the process is complicated
The above-mentioned preparation process seriously increases the cost and the complexity of the process
[0005] Third, recrystallization and abnormal grain growth occur during hot forging or hot rolling
However, in the process of hot forging and hot rolling, there are phenomena of recrystallization of deformed grains and abnormal growth of grains, resulting in abnormal fracture of the material and affecting safe service

Method used

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  • A kind of homogeneous high-strength cocrni-b medium entropy alloy and preparation method thereof
  • A kind of homogeneous high-strength cocrni-b medium entropy alloy and preparation method thereof
  • A kind of homogeneous high-strength cocrni-b medium entropy alloy and preparation method thereof

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Experimental program
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preparation example Construction

[0041] The preparation method of homogeneous high-strength CoCrNi-B medium entropy alloy of the present invention comprises the steps:

[0042] (1) Ingredients: Take raw materials Co, Ni, Cr and B according to the specified ratio.

[0043] (2) High-energy ball milling: Add raw materials Cr and B into a vacuum ball milling tank for ball milling, the ball milling medium is absolute ethanol, the ball-to-material ratio is 10-80:1, the rotating speed is 350-550rpm, and the ball milling time is 1-24h; ball milling After the completion, the ball mill slurry was left to stand in a vacuum environment for 2-10 hours, then the upper clear liquid was removed, and the bottom sediment was dried in a vacuum drying oven at a drying temperature of 55-80°C to obtain Cr-B composite powder.

[0044] (3) Low-temperature curing pre-sintering: the Cr-B composite powder compact prepared in step (2) is subjected to low-temperature curing pre-sintering treatment in a vacuum tube furnace to obtain a Cr-...

Embodiment 1

[0055] A homogeneous high-strength (CoCrNi) 99.92 B 0.08 The preparation method of medium entropy alloy, the preparation method is as follows:

[0056] (1) Ingredients

[0057] Cr: 30.7g, superfine chromium powder;

[0058] Co: 34.7g, block, particle size about 1cm;

[0059] Ni: 34.6g, granular, particle size 1-5mm;

[0060] B: 0.08g, high-purity powder, 400 mesh.

[0061] (2) High energy ball mill

[0062] Add high-purity Cr powder and B powder into a vacuum ball mill tank, use absolute ethanol as the ball mill medium; the ball-to-material ratio is 60:1, the rotation speed is 450 rpm, the ball milling time is 6 hours, and the ball milling aid is stearic acid.

[0063] After ball milling, transfer the ball mill slurry to a beaker, and let it stand in a vacuum environment for 2 hours until the upper layer of the beaker is obviously clear, and the Cr-B composite powder settles at the bottom. In the vacuum glove box, use a pipette to remove the upper clear liquid, transfer...

Embodiment 2

[0072] A homogeneous high-strength (CoCrNi) 99.95 B 0.05 Medium entropy alloy, the preparation method is as follows:

[0073] (1) Ingredients

[0074] Cr: 30.7g, superfine chromium powder;

[0075] Co: 34.7g, block, particle size about 1cm;

[0076] Ni: 34.6g, granular, particle size 1-5mm;

[0077] B: 0.05g, high-purity powder, 400 mesh.

[0078] (2) High energy ball mill

[0079] Add the high-purity Cr powder and B powder into the vacuum ball mill tank, and use absolute ethanol as the ball mill medium;

[0080] The ball-to-material ratio is 40:1, the rotation speed is 350rpm, the ball milling time is 12h, and the ball milling aid is stearic acid;

[0081] After ball milling, transfer the ball mill slurry to a beaker, and let it stand in a vacuum environment for 2 hours until the upper layer of the beaker is obviously clear, and the Cr-B composite powder settles at the bottom. In a vacuum glove box, using a pipette, remove the supernatant liquid. Transfer the Cr-B co...

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Abstract

The invention belongs to the technical field of metal materials and their preparation, and specifically discloses a homogeneous high-strength CoCrNi-B medium-entropy alloy and a preparation method thereof. The chemical composition of described middle entropy alloy is: (CoCrNi) 100‑x B x , wherein the atomic ratio of Co, Cr and Ni is 1:1:1, and the value range of X is 0.00001‑0.5wt%. The preparation method includes the following steps: batching, high-energy ball milling, low-temperature solidification pre-sintering, smelting and solid solution heat treatment. The present invention combines the liquid phase method and the high-energy ball milling method, and simplifies the multiple remelting and refining processes of the medium-entropy alloy, thereby preparing a homogeneous and high-strength medium-entropy alloy at a relatively low cost. The process of the present invention can not only reduce the main The segregation phenomenon of the element can be shortened, the smelting time can be shortened, and the number of remelting times can be reduced. It has the advantages of low preparation cost, few defects, and good mechanical properties.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, in particular to a homogeneous high-strength CoCrNi-B medium-entropy alloy and a preparation method thereof. Background technique [0002] Multi-principal alloy is a concept corresponding to traditional single-principal alloy. It refers to a single-phase solid solution mixed with various metal elements in an equiatomic ratio or non-equioatomic ratio. It generally has high strength, high hardness, and Wear resistance, corrosion resistance, light weight and high temperature stability. At present, the relevant research on multi-principal alloys is mainly based on high-entropy alloys, which are composed of five or more metal elements. However, the preparation process of high-entropy alloys is complex, costly and brittle, making it difficult to industrialize. Medium-entropy alloys refer to alloys composed of about three principal components, among which CoCrNi three-principal med...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00
CPCC22C30/00C22C1/02C22F1/002
Inventor 冯科张芝民朱科徐诗鑫白书霞
Owner 西安慧金科技有限公司
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