Preparation method of VNbMoTaW high-entropy alloy

A high-entropy alloy and body-centered cubic technology, which is applied in the field of high-entropy alloys, can solve the problems of deteriorating the mechanical properties of alloys, increasing personnel injuries, and adjusting the cooling speed, so as to simplify the alloy preparation process, eliminate component segregation, and reduce processing temperature. Effect

Active Publication Date: 2020-07-14
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, considerable Ta 2 VO 6 , which deteriorates the mechanical properties of the alloy
Even if there is research on the use of hot pressing sintering method, excessive pressure will cause damage to the equipment. Moreover, conventional hot pressing sintering furnaces cannot adjust the cooling rate. Undoubtedly increases the risk of personal injury and equipment damage

Method used

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  • Preparation method of VNbMoTaW high-entropy alloy
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  • Preparation method of VNbMoTaW high-entropy alloy

Examples

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Effect test

Embodiment 1

[0034] A preparation method of the VNbMoTaW high-entropy alloy of the present invention, comprising the following steps:

[0035] (1) Mechanical alloying method: 50 g of equiatomic ratio mixed powders of W, Mo, V, Nb, and Ta five kinds of elemental powders were used as raw materials, and ball milled in a ball mill tank of a planetary high-energy ball mill. The material of the tank body and the grinding balls are all WC carbide, and the inside of the ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protective atmosphere. During the ball milling process, the ball-to-material ratio was 10:1, and the rotational speed was 300 r / min. After 15 hours of ball milling, the VNbMoTaW high-entropy alloy powder with equiatomic ratio was obtained. The VNbMoTaW alloy powder was taken out and detected by XRD. At this time, the powder had transformed into a two-phase BCC solid solution.

[0036] (2) Put the VNbMoTaW alloy powder into a graphite mold (isostatically pr...

Embodiment 2

[0038] A preparation method of the VNbMoTaW high-entropy alloy of the present invention, the preparation process is basically the same as that of Example 1, the only difference is: in step (1), the ball milling time is 20h; in step (2), the pressure is 40MPa, and the heating rate is 10°C / min, the holding temperature is 1800°C.

[0039] Equiatomic VNbMoTaW high-entropy alloy powders were obtained after ball milling, and their XRD results showed that they were two-phase BCC solid solutions. VNbMoTaW high-entropy alloy bulk with a density of 99.7%, such as figure 2 As shown, its XRD results show that it is a single-phase BCC solid solution.

Embodiment 3

[0041] A preparation method of the VNbMoTaW high-entropy alloy of the present invention, the preparation process is basically the same as that of Example 1, the only difference is: in step (1), the ball milling time is 30h; in step (2), the pressure is 30MPa, and the heating rate is 5°C / min, the holding temperature is 1900°C.

[0042] Equiatomic VNbMoTaW high-entropy alloy powders were obtained after ball milling, and their XRD results showed that they were two-phase BCC solid solutions. VNbMoTaW high-entropy alloy bulk with a density of 99.6%, such as image 3 As shown, its XRD results show that it is a single-phase BCC solid solution.

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Abstract

The invention discloses a preparation method of a VNbMoTaW high-entropy alloy. The preparation method of the VNbMoTaW high-entropy alloy comprises the following steps that simple substance powder of W, Mo, V, Nb and Ta are mixed by adopting a mechanical alloying method firstly, ball milling is carried out without adding a ball milling medium to obtain single-phase or double-phase single-body centripetal cubic structure VNbMoTaW high-entropy alloy powder, then hot-pressing sintering is adopted, the pressure ranges from 30 MPa to 50 MPa, the heating rate ranges from 5 DEG C/min to 15 DEG C/min,the heat preservation temperature ranges from 1700 DEG C to 1900 DEG C, and the VNbMoTaW high-entropy alloy block with the single-phase single-body centripetal cubic structure and the density larger than 99.5% is obtained. The preparation method of the VNbMoTaW high-entropy alloy is simple in process, a block material with good performance can be obtained without being heated to the melting pointtemperature, the processing temperature is effectively reduced, the preparation cost is lower, and a very high industrial application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, and relates to a method for preparing a VNbMoTaW high-entropy alloy, in particular to a method for preparing a VNbMoTaW high-entropy alloy with a high melting point. Background technique [0002] High-entropy alloys (High-entropy alloys) are a new class of multi-principal alloys first discovered by Cantor's team in experiments in 2004, and named by Ye Junwei in the same year based on the high mixing entropy of this type of alloy. Unlike traditional alloys, which consist of one main element and multiple trace elements, high-entropy alloys are solid solutions composed of multiple elements (usually more than 4) in equal or nearly equal proportions. Under the effect of high thermodynamic entropy, atoms with different properties occupy disorder in the solid solution, resulting in severe lattice distortion. The special crystal structure makes high-entropy alloys have excellent properties s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/00C22C27/00
CPCB22F3/14B22F9/04B22F2009/041B22F2009/043B22F2998/10C22C1/045C22C27/00C22C30/00
Inventor 唐宇李顺白书欣乔娅婷叶益聪朱利安刘希月王震
Owner NAT UNIV OF DEFENSE TECH
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