Powder metallurgy refractory multi-principal-element high-entropy alloy and preparation method thereof

A high-entropy alloy and powder metallurgy technology, which is applied in the field of powder metallurgy refractory multi-principal high-entropy alloy and its preparation, can solve the problem of restricting the application and promotion of refractory multi-principal high-entropy alloy materials, and refractory multi-principal high-entropy alloys. Difficulty in large-scale mass production of alloys, high cost and other issues, to achieve the effect of easy safety risk control, fine microstructure, and conducive to diffusion

Active Publication Date: 2021-10-26
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the large-scale mass production of refractory multi-principal high-entropy alloys using the above preparation methods is relatively difficult or very costly, which limits the application and promotion of refractory multi-principal high-entropy alloy materials

Method used

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  • Powder metallurgy refractory multi-principal-element high-entropy alloy and preparation method thereof
  • Powder metallurgy refractory multi-principal-element high-entropy alloy and preparation method thereof
  • Powder metallurgy refractory multi-principal-element high-entropy alloy and preparation method thereof

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preparation example Construction

[0053] A method for preparing a powder metallurgy refractory multi-principal element high-entropy alloy, specifically comprising the following steps:

[0054] Step S1: pass the refractory metal element through a 300-mesh sieve; the powder is mixed in a multi-component powder mixing method to obtain a mixture;

[0055] The compound is at least four elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W;

[0056] The atomic percentage of each element in the mixture is 5%-35%; the total percentage is 100%;

[0057] Step S2: pressing and forming to obtain a compact;

[0058] Step S3: Vacuum high-temperature solid phase sintering to obtain a sintered block.

[0059] The present invention adopts multi-element powder mixing mode to process raw material powder.

[0060] This method uses high-purity elemental powders for mixing. The difference from high-energy ball milling mechanical alloying is that this method only mixes multi-element powders without grinding. It has the following advantage...

Embodiment

[0093]A refractory multi-principal high-entropy alloy containing Ti, Zr, Hf and Ta is taken as an example, wherein the atomic percentages of Ti, Zr, Hf and Ta are 28.33%, 28.33%, 28.33% and 15.01% respectively. According to the data, the melting point T of the alloy m About 1850°C, from the sintering temperature T s = α·T m Calculated, its sintering temperature T s The range is 1387.5°C-1585.7°C. In order to facilitate the setting of sintering process parameters, 1400°C and 1500°C within this range are taken as the sintering temperature for the test. The test set the sintering process parameters composed of different sintering temperature and holding time, respectively 1500°C×60 minutes, 1500°C×180 minutes, 1500°C×300 minutes, 1500°C×420 minutes, 1400°C×300 minutes, 1300°C × 300 minutes, 1800°C × 300 minutes.

[0094] 1. Preparation

[0095] Step S1: multi-element powder mixing;

[0096] Commercially available Ti powder, Zr powder, Hf powder and Ta powder with purity ≥ 9...

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Abstract

The invention relates to the technical field of powder metallurgy preparation of refractory metal materials, and specifically discloses a preparation method of a powder metallurgy refractory multi-principal-element high-entropy alloy. The preparation method of the powder metallurgy refractory multi-principal-element high-entropy alloy specifically comprises the following steps: step S1, refractory metal element powder is sieved through a 300-mesh sieve and mixed in a multi-element powder mixing mode, so that a mixture is obtained; the mixture comprises at least four elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W; the atomic percent of each element in the mixture is 5%-35%; and the total percentage is 100%; step S2, pressing forming is carried out, and a pressed blank is obtained; and S3, vacuum high-temperature solid-phase sintering is carried out to obtain a sintered block. The preparation method of the powder metallurgy refractory multi-principal-element high-entropy alloy has the advantages that the components are easy to regulate and control, the production efficiency is high, and near-net forming is achieved; the prepared powder metallurgy refractory multi-principal-element high-entropy alloy is stable in structure and performance and low in cost; and the powder metallurgy refractory multi-principal-element high-entropy alloy has remarkable advantages in research and development of high-performance powder metallurgy refractory multi-principal-element high-entropy alloy and flexible batch production of products of various shapes and varieties.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation of refractory metal materials, and in particular relates to a powder metallurgy refractory multi-principal element high-entropy alloy and a preparation method thereof. Background technique [0002] The existing methods for preparing refractory multi-principal high-entropy alloy blocks are mainly arc melting casting process and powder metallurgy mechanical alloying + spark plasma sintering process. These two processes are mostly used in the preparation of laboratory-level refractory multi-principal element high-entropy alloys, but they face many problems when they are put into large-scale mass production. The problems existing in these two processes are described below. [0003] At present, the most commonly used method for preparing refractory multi-principal high-entropy alloy bulk materials is the arc melting casting process, but this process is quite complicated (such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/00B22F1/00B22F3/02B22F3/04B22F3/10
CPCC22C1/045C22C1/0458C22C30/00B22F3/02B22F3/04B22F3/1007B22F2998/00B22F2201/20
Inventor 任俊业张向东王家文常宇岳映雷汪彩芬李先容贾玉斌鄂荣高为柯祖斌董嘉琳
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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