A kind of preparation method of high-entropy alloy powder and high-hardness high-entropy alloy coating

Abstract

The invention provides a method for preparing a high-entropy alloy powder and a high-hardness high-entropy alloy coating. By adding B element into the conventional FeNiAlCrCo alloy, the grain diameter of the high-entropy alloy coating prepared by the high-entropy alloy powder is greatly reduced. Small, so that the high-entropy alloy coating has very good hardness, and after further analysis of the addition of B element, the optimal B element addition is obtained.

Description

technical field

[0001] The invention relates to the field of alloy materials, in particular to a method for preparing a high-entropy alloy powder and a high-hardness high-entropy alloy coating. Background technique

[0002] In 1995, Ye Junwei, a Taiwanese scholar, first proposed the concept of high-entropy alloys. High-entropy alloys are usually composed of 5 or more elements, and the content of each element is not less than 5%, but not more than 35%. to express its characteristics. In order to give full play to the effect of high disorder in the alloy system and distinguish it from traditional alloys, the number of principal elements of high-entropy alloys is usually defined to be n≥5. By analogy, traditional alloys with a single element as the main component can be classified into the category of low-entropy alloys, while medium-entropy alloys are in between, and the number of components contained in this category is usually 2-4.

[0003] High-entropy alloys have many c...

Examples

Embodiment 1

[0021] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps: mixing Fe, Ni, Al, Cr, Co, and B element powders with a purity higher than 99.9%, and performing ball milling at room temperature using a planetary ball mill, The ball-milled powder is pre-placed on the substrate with a pre-set thickness of 1.5mm. After the pre-coating is dried, multi-pass cladding is performed on a carbon dioxide high-power laser. The laser power used is 500W and the scanning speed is 3mm / s. The spot diameter is 4mm, and the inert gas argon is used for protection during cladding;

[0022] The Fe, Ni, Al, Cr, and Co element powders in the step A are equimolar mixing, and the molar amount of the B element powder added is 75% of other elements, that is, the expression of the alloy is FeNiAlCrCoBx, x=0.75;

[0023] The milling time of the ball mill is 8 hours, the ball-to-material ratio (mass ratio) is 10:1, and the milling speed is 200 r / min.

Embodiment 2

[0025] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps: mixing Fe, Ni, Al, Cr, Co, and B element powders with a purity higher than 99.9%, and performing ball milling at room temperature using a planetary ball mill, The ball-milled powder is pre-placed on the substrate with a pre-set thickness of 1.5mm. After the pre-coating is dried, multi-pass cladding is performed on a carbon dioxide high-power laser. The laser power used is 500W and the scanning speed is 3mm / s. The spot diameter is 4mm, and the inert gas argon is used for protection during cladding;

[0026] The Fe, Ni, Al, Cr, and Co element powders in the step A are equimolar mixing, and the molar amount of the B element powder added is 50% of other elements, that is, the expression of the alloy is FeNiAlCrCoBx, x=0.5;

[0027] The milling time of the ball mill is 8 hours, the ball-to-material ratio (mass ratio) is 10:1, and the milling speed is 200 r / min.

Embodiment 3

[0029] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps: mixing Fe, Ni, Al, Cr, Co, and B element powders with a purity higher than 99.9%, and performing ball milling at room temperature using a planetary ball mill, The ball-milled powder is pre-placed on the substrate with a pre-set thickness of 1.5mm. After the pre-coating is dried, multi-pass cladding is performed on a carbon dioxide high-power laser. The laser power used is 500W and the scanning speed is 3mm / s. The spot diameter is 4mm, and the inert gas argon is used for protection during cladding;

[0030] The Fe, Ni, Al, Cr, and Co element powders in the step A are equimolar mixing, and the molar amount of the B element powder added is 25% of other elements, that is, the expression of the alloy is FeNiAlCrCoBx, x=0.25;

[0031] The milling time of the ball mill is 8 hours, the ball-to-material ratio (mass ratio) is 10:1, and the milling speed is 200 r / min.

technical field

[0001] The invention relates to the field of alloy materials, in particular to a method for preparing a high-entropy alloy powder and a high-hardness high-entropy alloy coating. Background technique

[0002] In 1995, Ye Junwei, a Taiwanese scholar, first proposed the concept of high-entropy alloys. High-entropy alloys are usually composed of 5 or more elements, and the content of each element is not less than 5%, but not more than 35%. to express its characteristics. In order to give full play to the effect of high disorder in the alloy system and distinguish it from traditional alloys, the number of principal elements of high-entropy alloys is usually defined to be n≥5. By analogy, traditional alloys with a single element as the main component can be classified into the category of low-entropy alloys, while medium-entropy alloys are in between, and the number of components contained in this category is usually 2-4.

[0003] High-entropy alloys have many c...

Examples

Embodiment 1

[0021] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps: mixing Fe, Ni, Al, Cr, Co, and B element powders with a purity higher than 99.9%, and performing ball milling at room temperature using a planetary ball mill, The ball-milled powder is pre-placed on the substrate with a pre-set thickness of 1.5mm. After the pre-coating is dried, multi-pass cladding is performed on a carbon dioxide high-power laser. The laser power used is 500W and the scanning speed is 3mm / s. The spot diameter is 4mm, and the inert gas argon is used for protection during cladding;

[0022] The Fe, Ni, Al, Cr, and Co element powders in the step A are equimolar mixing, and the molar amount of the B element powder added is 75% of other elements, that is, the expression of the alloy is FeNiAlCrCoBx, x=0.75;

[0023] The milling time of the ball mill is 8 hours, the ball-to-material ratio (mass ratio) is 10:1, and the milling speed is 200 r / min.

Embodiment 2

[0025] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps: mixing Fe, Ni, Al, Cr, Co, and B element powders with a purity higher than 99.9%, and performing ball milling at room temperature using a planetary ball mill, The ball-milled powder is pre-placed on the substrate with a pre-set thickness of 1.5mm. After the pre-coating is dried, multi-pass cladding is performed on a carbon dioxide high-power laser. The laser power used is 500W and the scanning speed is 3mm / s. The spot diameter is 4mm, and the inert gas argon is used for protection during cladding;

[0026] The Fe, Ni, Al, Cr, and Co element powders in the step A are equimolar mixing, and the molar amount of the B element powder added is 50% of other elements, that is, the expression of the alloy is FeNiAlCrCoBx, x=0.5;

[0027] The milling time of the ball mill is 8 hours, the ball-to-material ratio (mass ratio) is 10:1, and the milling speed is 200 r / min.

Embodiment 3

[0029] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps: mixing Fe, Ni, Al, Cr, Co, and B element powders with a purity higher than 99.9%, and performing ball milling at room temperature using a planetary ball mill, The ball-milled powder is pre-placed on the substrate with a pre-set thickness of 1.5mm. After the pre-coating is dried, multi-pass cladding is performed on a carbon dioxide high-power laser. The laser power used is 500W and the scanning speed is 3mm / s. The spot diameter is 4mm, and the inert gas argon is used for protection during cladding;

[0030] The Fe, Ni, Al, Cr, and Co element powders in the step A are equimolar mixing, and the molar amount of the B element powder added is 25% of other elements, that is, the expression of the alloy is FeNiAlCrCoBx, x=0.25;

[0031] The milling time of the ball mill is 8 hours, the ball-to-material ratio (mass ratio) is 10:1, and the milling speed is 200 r / min.

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