High-specific-strength high-plasticity refractory high-entropy alloy and preparing method thereof

A high-specific-strength, high-entropy alloy technology, applied in the field of metal materials, can solve problems that cannot meet the needs of practical applications, and achieve the effects of good liquid fluidity, low cost, and high densification

Active Publication Date: 2018-10-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing alloys cannot meet the requirements of practical application in terms of tensile properties at room te...

Method used

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  • High-specific-strength high-plasticity refractory high-entropy alloy and preparing method thereof
  • High-specific-strength high-plasticity refractory high-entropy alloy and preparing method thereof
  • High-specific-strength high-plasticity refractory high-entropy alloy and preparing method thereof

Examples

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Embodiment 1

[0036] This embodiment is to prepare a V 10 Nb 10 Zr 45 Ti 35 Refractory high-entropy alloy, the alloy is composed of V, Nb, Zr, Ti four elements. The atomic radius size difference δ is 5.65%, the valence electron concentration VEC is 4.20; the density of the alloy is 99.7%, and the density is 5.99g*cm -3 . from figure 1 It can be seen from the XRD pattern of the alloy that the alloy has a simple BCC crystal structure without precipitation of other phases.

[0037] The metal purity of V, Nb, Zr, Ti is higher than 99.9%;

[0038] The alloy of the present invention can be prepared by various methods, including induction melting, suspension melting, arc melting, mechanical alloying and so on. A kind of preparation method is given as follows now:

[0039] (1) Select four massive pure metals of V, Nb, Zr, and Ti, use 150-mesh sandpaper to remove the surface oxide skin, perform ultrasonic cleaning for 20 minutes, and use an electronic balance to weigh V: 5.65g, Nb: 10.30g in...

Embodiment 2

[0044] This example is to prepare a kind of Al 4.5 V 15 Nb 20 Zr 30 Ti 30 o 0.5 Refractory high-entropy alloy, the alloy is composed of Al, V, Nb, Zr, Ti, O six elements, the atomic radius size difference δ of this alloy is 5.92%, and the valence electron concentration VEC is 4.32; the density of the alloy is 99.7%, the density is 6.09g*cm -3 . from figure 1 It can be seen from the XRD pattern of the alloy that the alloy has a simple BCC crystal structure without precipitation of other phases.

[0045] The V, Nb, Zr, Ti, Al, ZrO 2 Purity higher than 99.9%;

[0046] The alloy of the present invention can be prepared by various methods, including induction melting, suspension melting, arc melting, mechanical alloying and so on. A kind of preparation method is given as follows now:

[0047] (1) Select V, Nb, Zr, Ti, Al four bulk pure metals and bulk ZrO 2 , use 150-grit sandpaper to remove its surface scale, then perform ultrasonic cleaning for 20 minutes, use an elec...

Embodiment 3

[0052] This example is to prepare a kind of Al 1 Ni 0.5 V 15 Nb 13 Zr 25 Ti 40 N 0.5 Refractory high-entropy alloy, the alloy is composed of seven elements: Al, Ni, V, Nb, Zr, Ti, and N. The atomic radius size difference δ is 6.02%, and the valence electron concentration VEC is 4.32;. The density of the alloy is 99.8%, and the density is 6.34g*cm -3 . from figure 1 It can be seen from the XRD pattern that the alloy is composed of BCC simple phase structure.

[0053] The alloy of the present invention can be prepared by various methods, including induction melting, suspension melting, arc melting, mechanical alloying and so on. A kind of preparation method is given as follows now:

[0054] (1) Select Al, Ni, V, Nb, Zr, Ti six block pure metals and block TiN, use 150 mesh sandpaper to remove the surface oxide skin, and then perform ultrasonic cleaning for 20 minutes. Al: 0.35g, Ni: 0.38g, V: 9.82g, Nb: 15.51g, Zr: 29.28g, Ti: 24.28g, : 0.40g were sequentially weighed...

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Abstract

The invention relates to a high-specific-strength high-plasticity refractory high-entropy alloy and a preparing method thereof, and belongs to the technical field of metal materials. The expression isVaNbbZrcTidMeNfPg, wherein M, N, P can be the elements such as Cr, Al, Ni, Fe, Si, O, B, C, and N; a is no less than 15% and no more than 20%, b is no less than 15% and no more than 25%, c is no lessthan 30% and no more than 50%, d is no more than 30% and no less than 50%, e is no less than 0 and no more than 5%, f is no less than 0 and no more than 5%, g is no less than 0 and no more than 5%, and the sum of a, b, c, d, e, f and g is 100%; and meanwhile, the valence electron concentration VEC of the alloy is no less than 4.1 and no more than 4.4, and the atomic radius size difference Delta is no less than 5.5% and no more than 6.4%. The alloy is prepared by various methods, the density of the VaNbbZrcTidMeNfPg alloy is less than 6.5 g*cm<-3>, the room temperature tensile strength is morethan 900 MPa, the plastic deformation is more than 15%, and the high specific strength and high plasticity are achieved; and after the temperature is increased to 600 DEG C, the weakening of the material is not very obvious, after the temperature is increased to 800 DEG C, the material can still maintain a certain strength, and the alloy has a certain storage ability for H2 and can be used in thefield of energy materials.

Description

technical field [0001] The invention relates to a refractory high-entropy alloy with high specific strength and high plasticity and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] High-entropy alloys are a new class of alloys with multiple principal components and simple phase structures. High-entropy alloys composed of refractory elements (Zr, Ti, Hf, V, Nb, Mo, Ta, W, etc.) have attracted extensive research due to their ability to maintain low creep and high strength at high temperatures. In the Zr-Ti-Hf-Nb-Ta, Zr-Ti-Hf-Nb-Mo, Mo-Nb-Ta-V-W and other series of refractory high-entropy alloys reported so far, the yield strength at 800 ° C exceeds 800 MPa , can still maintain a certain strength under the condition of more than 1600 ℃, and has shown a good application prospect in the fields of aerospace and other fields. [0003] Lightweight refractory high-entropy alloy composed of V, Nb, Zr, Ti, Al, Cr and oth...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 李云凯陈义文程兴旺薛云飞徐子祁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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