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(NbMoTaW)100-xMx series refractory high-entropy alloy and preparation method thereof

A technology of high-entropy alloys and alloys, applied in the field of high-entropy alloys and high-temperature-resistant alloys, can solve problems such as the use of refractory high-entropy alloy materials, and achieve the effect of improving deformation resistance

Active Publication Date: 2019-01-11
UNIV OF SCI & TECH BEIJING
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  • Claims
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Problems solved by technology

[0004] According to the early design of NbMoTaW and NbMoTaWV two high-entropy alloys by Senkev et al. to characterize their mechanical properties and microstructure, the research shows that the alloy system has good strength (1600°C, 600MPa) and plasticity at high temperature, but at room temperature The plasticity is less than 2%, thus limiting the further use of this system of refractory high-entropy alloy materials

Method used

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  • (NbMoTaW)100-xMx series refractory high-entropy alloy and preparation method thereof

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preparation example Construction

[0038] above (NbMoTaW) 100-x m x It is a preparation method of a refractory high-entropy alloy, and the preparation method specifically includes the following steps:

[0039] Step 1: Use metallurgical pure elements with a purity of more than 99.9% as raw materials to remove the oxide layer and impurities of Nb, Mo, Ta, W, and put them into ethanol or acetone for ultrasonic cleaning. Cut into fine particles, O element is added in the form of metal oxide particles.

[0040] Step 2: Calculate the mass of Nb, Mo, Ta, W, C, B and oxides required for each alloy according to the atomic ratio of the design components, and then carry out weighing and proportioning for smelting and preparing alloys;

[0041] Step 3: Use a vacuum non-consumable tungsten electrode electric arc furnace to melt the alloy, and vacuum the sample chamber. When the vacuum degree is higher than 5*10 -3 Pa, filled with industrial argon;

[0042] Step 4: Pre-alloying is first smelted according to the differenc...

Embodiment 1

[0045] (NbMoTaW) 99.96 B 0.04 Alloy preparation and characterization:

[0046] (1) Raw material preparation: Weigh clean raw materials separately, take Nb: 3.324g, Mo: 3.466g, Ta: 6.536g, W: 6.641g, B: 0.0006g;

[0047] (2) Alloy smelting: first, B and a certain quality of Nb are smelted into a pre-alloy, so that B is completely melted in Nb to form a niobium alloy; then two kinds of raw materials are selected according to the difference in melting point to smelt an intermediate alloy, and through multiple smelting. The elements of the master alloy are evenly distributed; finally, the two master alloys are combined into the same crucible, and the alloy ingot with uniform distribution of elements is formed by multiple melting;

[0048] (3) Material mechanical performance test and phase characterization: From the alloy ingots refined above, a cylindrical sample with a height-to-diameter ratio of 2:1 was taken out by wire cutting, and its surface was polished. The mechanical p...

Embodiment 2

[0051] (NbMoTaW) 99.5 B 0.5 Alloy preparation and characterization:

[0052] (1) Raw material preparation: Weigh the clean raw materials separately, take Nb: 3.354g, Mo: 3.465g, Ta: 6.534g, W: 6.638g, B: 0.0078g;

[0053] (2) Alloy smelting: first, B and a certain quality of Nb are smelted into a pre-alloy, so that B is completely melted in Nb to form a niobium alloy; then two kinds of raw materials are selected according to the difference in melting point to smelt an intermediate alloy, and through multiple smelting. The elements of the master alloy are evenly distributed; finally, the two master alloys are combined into the same crucible, and the alloy ingot with uniform distribution of elements is formed by multiple melting;

[0054] (3) Material mechanical performance test and phase characterization: From the alloy ingots refined above, a cylindrical sample with a height-to-diameter ratio of 2:1 was taken out by wire cutting, and its surface was polished. The mechanical...

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Abstract

The invention belongs to the field of high-entropy alloy and high temperature resistance alloy, and particularly relates to a (NbMoTaW)100-xMx series refractory high-entropy alloy and a preparation method of the (NbMoTaW)100-xMx series refractory high-entropy alloy. The chemical ingredient of the alloy is (NbMoTaW)100-xMx (0<X<=5%), M is one or two of B, C and O, and the content of each element except for the element M is not smaller than 5% and is not higher than 35%. The preparation method comprises the steps that impurities such as surface scale in needed raw materials are removed, and weighing is carried out according to the atomic ratio; and alloy ingredients are smelted into a cast ingot through vacuum electric arc melting. The high-entropy alloy has the good plasticity at room temperature, meanwhile has the excellent high temperature strength and plasticity, can be used for high temperature structural parts and the like in special working condition environment, and has the wideapplication prospect in the high temperature field.

Description

technical field [0001] The invention belongs to the field of high-entropy alloys and high-temperature-resistant alloys, in particular to a (NbMoTaW) with good plasticity and strength at room temperature and relatively high mechanical properties at high temperatures 100-x m x It is a refractory high-entropy alloy and its preparation method, which is expected to have important application value in the field of high-temperature alloys. technical background [0002] According to the needs of the current development of high-tech equipment, new materials that meet human needs are one of the key factors to improve equipment reliability and exert excellent performance. The materials currently serving in high temperature environments are mainly used for turbine blades of steam turbines. At present, titanium alloys are mostly used as materials for compressor disks and blades, and their high temperature resistance is up to 600 ° C. At the same time, the latter stages of the compressor...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/03
CPCC22C1/03C22C27/04C22C30/00
Inventor 吴渊王正奇王辉刘雄军吕昭平
Owner UNIV OF SCI & TECH BEIJING
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