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TaTiNb-based multi-principal-element single-phase alloy with high corrosion resistance

A high corrosion resistance, single-phase alloy technology, applied in the field of metal materials, can solve the problems of plasticity and corrosion resistance, high alloy cost, unfavorable development and application, etc., to improve plasticity and corrosion resistance, and good corrosion resistance. , the effect of excellent comprehensive performance

Active Publication Date: 2020-04-17
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional multi-principal alloys based on AlCoCr usually form a dual-phase structure, which greatly affects plasticity and corrosion resistance. Multi-principal alloys formed by high melting point elements can form a single-phase structure, but due to the existing research The alloy ratio is carried out in an equimolar manner, and the addition of too many high melting point elements makes the cost of the alloy too high, which is not conducive to development and application

Method used

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  • TaTiNb-based multi-principal-element single-phase alloy with high corrosion resistance
  • TaTiNb-based multi-principal-element single-phase alloy with high corrosion resistance
  • TaTiNb-based multi-principal-element single-phase alloy with high corrosion resistance

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Embodiment 1

[0022] The preparation steps of the TaTiNb-based multi-principal element single-phase alloy described in the present invention are as follows:

[0023] 1. Use Hf, Nb, Ta, Ti, Zr metal elements with a purity of more than 99.5% as raw materials, use a wire electric discharge machine to cut the pure metal element raw materials, and use 240# sandpaper and a grinding wheel to remove the oxide skin on the surface of the pure metal element raw materials Polish it off, and use the molar ratio of Hf:Nb:Ta:Ti:Zr=4:27:15:49:5 to weigh the required mass with an electronic balance, and the error between the actual mass and the theoretically calculated mass is within 1%. Pure metal elemental raw materials of Hf, Nb, Ta, Ti and Zr;

[0024] 2. In order to avoid the introduction of impurities that affect the experiment, before the vacuum arc melting, it is necessary to put the five kinds of pure metal elements that have been weighed into acetone and use ultrasonic cleaning, then put them into...

Embodiment 2

[0033] On the basis of Example 1, the difference from Example 1 is that the molar ratio of each metal element in step (1) is Hf:Nb:Ta:Ti:Zr=4:29:15:47:5, Other steps and conditions are all the same as in Example 1, and correspondingly the yield strength of the multi-principal single-phase alloy is 532MPa, showing obvious plasticity, and the compressibility is 74%; The self-corrosion potentials are -0.39V and -0.12V respectively, and the self-corrosion current densities are 7.7×10 - 8 A·cm -2 and 3.2×10 -8 A·cm -2 , there is a passivation zone.

Embodiment 3

[0035] On the basis of Example 1, the difference from Example 1 is that the molar ratio of each metal element in step (1) is Hf:Nb:Ta:Ti:Zr=5:27:15:47:6, Other steps and conditions are all the same as in Example 1, and correspondingly the yield strength of the multi-principal single-phase alloy is 551MPa, showing obvious plasticity, and the compressibility is 66%; The self-corrosion potentials are -0.41V and -0.18V respectively, and the self-corrosion current densities are 8.1×10 - 8 A·cm -2 and 4.3×10 -8 A·cm -2 , there is a passivation zone.

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Abstract

The invention provides a TaTiNb-based multi-principal-element single-phase alloy with high corrosion resistance. The alloy comprises the following components of, in molar ratio, 25-32 of Nb, 12-19 ofTa, 47-54 of Ti, 1-7 of Hf and 2-8 of Zr; the structure of the alloy is a single-phase body-centered cubic structure, the alloy has high plasticity and corrosion resistance, the compressive yield strength of the alloy is 400-600 MPa, the compression ratio is 65%-85%, the self-corrosion potential of the alloy in a 3.5% NaCl solution is -0.37 to -0.47V, the self-corrosion potential of the alloy in asulfuric acid solution with the concentration being 1mol / L is -0.12 to -0.22V, and the self-corrosion current densities of the alloy are 7.4 * 10<-8> to 8.6 * 10<-8>A.cm<-2> and 3.2 * 10<-8> to 4.7 *10<-8> A.cm<-2> correspondingly.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a TaTiNb-based multi-principal element single-phase alloy with high corrosion resistance. Background technique [0002] Multi-principal alloys are mixed with five or more elements and have the characteristics of high strength, high hardness, wear resistance and corrosion resistance. In recent years, more and more researchers have carried out related research, including multi-principal alloy composition design, microstructure, physical and chemical properties, mechanical properties and heat treatment process. Since multi-principal alloys have infinite possibilities in composition design, multi-principal alloys will greatly broaden the boundaries of research in the field of materials. Traditional multi-principal alloys based on AlCoCr usually form a dual-phase structure, which greatly affects plasticity and corrosion resistance. Multi-principal alloys formed by high meltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00
CPCC22C14/00C22C30/00
Inventor 农智升王子玥王浩玉王继杰王赫男
Owner SHENYANG AEROSPACE UNIVERSITY