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

A high-entropy alloy and powder metallurgy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problem of limiting the application and promotion of refractory multi-principal element high-entropy alloy materials, and large-scale mass production of refractory multi-principal element high-entropy alloys Difficulty, high cost and other issues, to achieve the effect of easy safety risk control, fine microstructure, and conducive to diffusion

Active Publication Date: 2022-05-27
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • 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 its preparation method
  • Powder metallurgy refractory multi-principal element high-entropy alloy and its preparation method
  • Powder metallurgy refractory multi-principal element high-entropy alloy and its preparation method

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preparation example Construction

[0053] The preparation method of powder metallurgy refractory multi-principal high-entropy alloy specifically includes the following steps:

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

[0055] The mixture is at least four elements in 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: press forming to obtain a pressed blank;

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

[0059] The present invention uses the multi-component powder mixing method to process the raw material powder.

[0060] This method uses element powders with higher purity for mixing, which is different from high-energy ball milling mechanical alloying in that this method only mixes multi-element powders without grinding them. It has the followi...

Embodiment

[0093]Take a refractory multi-principal high-entropy alloy containing Ti, Zr, Hf and Ta as an example, in which 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 of the alloy is T m About 1850℃, by the sintering temperature T s =α·T m Calculate, 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 testing. The sintering process parameters consisting of different sintering temperatures and holding times were set in the experiment, which were 1500℃×60 minutes, 1500℃×180 minutes, 1500℃×300 minutes, 1500℃×420 minutes, 1400℃×300 minutes, 1300℃ ×300 minutes, 1800°C ×300 minutes.

[0094] 1. Preparation

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

[0096] Weigh commercially available Ti powder, Zr powder, Hf powder and Ta powder with...

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Abstract

The present invention relates to the technical field of powder metallurgy preparation of refractory metal materials; specifically discloses a method for preparing powder metallurgy refractory multi-principal element high-entropy alloys, which specifically includes the following steps: Step S1: refractory metal element powder is passed through a 300-mesh sieve, and The multi-element powder mixing method is mixed to obtain a mixed material; the mixed material is at least four elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W; the atoms occupied by each element in the mixed material Percentages are 5%‑35%; total percentages are 100%. Step S2: Press forming to obtain a compact; Step S3: Vacuum high-temperature solid-phase sintering to obtain a sintered block. The invention has the advantages of easy composition control, high production efficiency, and near-net shape, and the prepared powder metallurgy refractory multi-principal element high-entropy alloy has relatively stable structure and performance, low cost, and is more suitable for high-performance powder metallurgy refractory alloys. There will be significant advantages in the research and development of principal element high-entropy alloys and the flexible mass production of multi-shape products.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation of refractory metal materials, in particular to a powder metallurgy refractory multi-principal element high-entropy alloy and a preparation method thereof. Background technique [0002] The existing refractory multi-principal high-entropy alloy bulk preparation methods mainly include arc melting and casting process and powder metallurgy mechanical alloying + spark plasma sintering process. These two processes are mostly used for the preparation of refractory multi-principal high-entropy alloys at the laboratory level, 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 arc melting and casting process is most commonly used to prepare refractory multi-principal high-entropy alloy bulk materials, but this process is quite complicated (such as patent literature:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C30/00B22F1/14B22F3/02B22F3/04B22F3/10
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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