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High-powder-yield mechanical alloying and sintering forming method for high-entropy alloy

A technology of mechanical alloying and high-entropy alloys, which is applied in the field of mechanical alloying and sintering of high-entropy alloys, can solve the problems of low powder yield of high-entropy alloys, achieve uniform composition, fine structure, and increase powder yield.

Pending Publication Date: 2021-10-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problem of low powder yield of high-entropy alloy prepared by the existing mechanical alloying method, and provides a mechanical alloying and sintering forming method of high powder yield of high-entropy alloy

Method used

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  • High-powder-yield mechanical alloying and sintering forming method for high-entropy alloy

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specific Embodiment approach 1

[0030] Specific Embodiment 1: This embodiment is a method of mechanical alloying and sintering forming of a high-entropy alloy with a high powder yield, which is specifically carried out according to the following steps:

[0031] 1. Ratio of elemental powder: Put Al elemental powder, Co elemental powder, Cr elemental powder, Cu elemental powder, Fe elemental powder and Ni elemental powder into the same ball mill pot, then put stainless steel balls into it, and seal the ball mill tank; wash the glove box with argon gas with a purity of 99.99% for 3 to 4 times;

[0032] The stainless steel grinding balls are composed of three kinds of ball mills with different diameters, the diameters are respectively 10mm-11mm, 8mm-9mm and 5mm-6mm, and the mass ratio of the three kinds of grinding balls is (2-2.2): (1- 1.2):(2~2.2);

[0033] The mass of the stainless steel grinding ball is 10 to 12 times the total mass of the powder;

[0034] The particle sizes of the Al elemental powder, Co ...

specific Embodiment approach 2

[0042] Embodiment 2: This embodiment differs from Embodiment 1 in that: In Step 1, the glove box is purged 3 times with argon gas with a purity of 99.99%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the stainless steel grinding balls described in step 1 are composed of three ball mills with different diameters, and the diameters are 10mm, 8mm and 5mm respectively. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a high-powder-yield mechanical alloying and sintering forming method for a high-entropy alloy, and relates to a mechanical alloying and sintering forming method for the high-entropy alloy. The invention aims to solve the technical problem of low powder yield of an existing mechanical alloying method for preparing the high-entropy alloy. In the step 3, high-speed ball milling is conducted without adding a process control agent, then stearic acid is added, and ball milling is continued, so that the phenomenon that powder adheres to balls and a tank is basically avoided, the powder yield is greatly improved and can reach 99.2%, the powder is completely alloyed, and the powder is fine. The prepared powder is subjected to vacuum hot press sintering to form the block Al<0.8>Co<0.5>Cr<1.5>FeNiCu high-entropy alloy, and the alloy structure is fine and uniform.

Description

technical field [0001] The invention relates to a high-entropy alloy mechanical alloying and sintering forming method. Background technique [0002] High-entropy alloys are a new type of alloy system that has emerged in recent years. Unlike traditional alloys such as aluminum alloys, magnesium alloys, steels, copper alloys, titanium alloys, and high-temperature alloys, which are composed of a single principal element, high-entropy alloys are designed based on the concept of multi-principal elements, usually consisting of five or more principal elements Composition, and the atomic content percentage of each principal element is in the range of 5% to 35%. High-entropy alloys are therefore also called multi-principal alloys, and the entropy value of the alloy is usually greater than 1.6R. High-entropy alloys have unique effects such as "high-entropy effect", "lattice distortion effect", "hysteretic diffusion effect", and "cocktail effect". These effects make many high-entrop...

Claims

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Application Information

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IPC IPC(8): C22C30/02B22F9/04C22C1/04B22F3/14
CPCC22C30/02B22F9/04C22C1/045C22C27/06B22F3/14B22F2009/043B22F2009/041
Inventor 姜巨福黄敏杰王迎刘英泽张颖
Owner HARBIN INST OF TECH
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