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High-melting-point high-entropy alloy NbMoTaWVTi and preparation method thereof

A high-entropy alloy and high melting point technology, applied in the field of high-entropy alloys, can solve problems such as dendrite segregation and alloy microstructure coarseness, and achieve the effects of reducing grain size, eliminating dendrite structure, and reducing energy consumption

Active Publication Date: 2016-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the microstructure of the alloy prepared by the vacuum arc melting method is coarse, and there is dendrite segregation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of high-melting-point high-entropy alloy NbMoTaWVTi adopts a forming method combining mechanical alloying and spark plasma sintering technology, which includes the following steps and process conditions:

[0036] Step 1: Preparation of NbMoTaWVTi high-entropy alloy powder by mechanical alloying method

[0037] (1) Weigh the Nb, Mo, Ta, W, V, Ti elemental powders according to the equiatomic ratio, and mix them evenly.

[0038] (2) Put the mixed powder and balls into the ball mill tank of the planetary high-energy ball mill for ball milling. The material of the tank body and the balls are all hard alloy. The ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protective atmosphere. With the prolongation of ball milling time, the mixed powder gradually realizes alloying, and the mixed powder of various elemental powders is transformed into an alloy powder with a single-phase BCC structure. At the same time, the grains inside th...

Embodiment 2

[0049] A preparation method of high-melting-point high-entropy alloy NbMoTaWVTi adopts a forming method combining mechanical alloying and spark plasma sintering technology, which includes the following steps and process conditions:

[0050] Step 1: Preparation of NbMoTaWVTi high-entropy alloy powder by mechanical alloying method

[0051] (1) Weigh the Nb, Mo, Ta, W, V, Ti elemental powders according to the equiatomic ratio, and mix them evenly.

[0052] (2) Put the mixed powder and balls into the ball mill tank of the planetary high-energy ball mill for ball milling. The material of the tank body and the balls are all stainless steel. The ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protection atmosphere. With the prolongation of ball milling time, the mixed powder gradually realizes alloying, and the mixed powder of various elemental powders is transformed into an alloy powder with a single-phase BCC structure. At the same time, the grains insi...

Embodiment 3

[0063] A preparation method of high-melting-point high-entropy alloy NbMoTaWVTi adopts a forming method combining mechanical alloying and spark plasma sintering technology, which includes the following steps and process conditions:

[0064] Step 1: Preparation of NbMoTaWVTi high-entropy alloy powder by mechanical alloying method

[0065] (1) Weigh the Nb, Mo, Ta, W, V, Ti elemental powders according to the equiatomic ratio, and mix them evenly.

[0066] (2) Put the mixed powder and balls into the ball mill tank of the planetary high-energy ball mill for ball milling. The material of the tank body and the balls are all stainless steel. The ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protection atmosphere. With the prolongation of ball milling time, the mixed powder gradually realizes alloying, and the mixed powder of various elemental powders is transformed into an alloy powder with a single-phase BCC structure. At the same time, the grains insi...

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Abstract

The invention belongs to the technical field of high-entropy alloys and discloses a high-melting-point high-entropy alloy NbMoTaWVTi and a preparation method of the high-melting-point high-entropy alloy NbMoTaWVTi. According to the method, a forming method that a mechanical alloying technology and a spark plasma sintering technology are combined is adopted. Compared with a traditional vacuum arc furnace casting method, by the adoption of the preparation method, operation is easier and more convenient, the temperature required in forming is lowered greatly, sintering time is short, a block material which is uniform in composition and near-total dense can be obtained through one-time sintering, and near-net forming is achieved; and the microscopic structure of the obtained alloy is characterized in that granular second phases are diffused and distributed in an isometric crystal matrix. By the adoption of the preparation method, the prepared alloy is uniform in structure and tiny in grain size and has higher strength and plasticity, and the optimum mechanical performance meets the conditions that compression yield strength is 2,709.2 MPa, the maximum compressive strength is 3,114.9 MPa, and the plasticity dependent variable generated in fracture is 7.5%.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to a high-melting-point high-entropy alloy NbMoTaWVTi and a preparation method thereof. Background technique [0002] High-melting point metals and high-temperature alloys have high melting points, excellent high-temperature mechanical properties and good thermal stability, so they are widely used in aerospace, atomic energy, metallurgy and chemical industries. With the development of science and technology, the requirements for the mechanical properties of high melting point metals and superalloys are getting higher and higher. The existing high melting point metals and high temperature alloy systems: nickel and nickel alloys, tungsten and tungsten alloys, titanium and titanium alloys, etc. have been It cannot meet the requirements of modern technology for the mechanical properties of high temperature resistant materials, so it is necessary to develop high melting point...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04B22F9/04B22F3/105
CPCC22C1/045C22C27/04C22C30/00B22F3/105B22F9/04B22F2998/10B22F2003/1051B22F2009/041
Inventor 龙雁高楠李小珍陈晓东
Owner SOUTH CHINA UNIV OF TECH
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