A kind of monbcrvti refractory high-entropy alloy and preparation method thereof
A high-entropy alloy and refractory technology, which is applied in the field of refractory high-entropy alloys with the composition MoNbCrVTi and their preparation, can solve the problems of difficulty in wide application and poor plasticity of refractory high-entropy alloys, and achieves wide application prospects, high strength, Excellent mechanical properties
Active Publication Date: 2019-08-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0004] Due to its high melting point and high strength, refractory high-entropy alloys have become potential high-temperature structural materials. However, refractory high-entropy alloys have poor plasticity at room temperature and are difficult to be widely used. Therefore, it is important to prepare a single-phase refractory high-entropy alloy. the meaning of
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[0026] 1. The preparation of MoNbCrVTi alloy, the specific steps are as follows:
[0027] 1) Raw material preparation: the constituent elements of the refractory high-entropy alloy developed by the present invention are molybdenum (Mo), niobium (Nb), chromium (Cr), vanadium (V) and titanium (Ti). When the alloy is prepared, the ingredients are distributed according to the nominal chemical composition, and the purity of the selected five elemental raw materials is higher than 99.5wt.%. The raw materials Mo and Cr are disk-shaped, Nb is flake-shaped, V is dendritic, and Ti is titanium sponge.
[0028] Firstly, the raw materials are pretreated: remove the oxide skin on the surface of Mo and Cr by mechanical means, clean and dry. Nb and V were first cleaned with petroleum ether for 15 minutes, then ultrasonically cleaned with ethanol for 15 minutes, and then dried in a drying oven (temperature 80°C, time 2 hours), and sponge titanium was directly dried in a drying oven (temperatu...
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Abstract
The invention relates to the field of metal materials and preparation for the same, in particular to refractory high-entropy alloy with MoNbCrVTi components and a method for preparing the refractory high-entropy alloy. The refractory high-entropy alloy comprises Mo, Nb, Cr, V and Ti. The method includes preparing elementary substances including the Mo, the Nb, the Cr, the V and the Ti according tonominal chemical components; smelting the elementary substances in vacuum electric arc furnaces to prepare alloy, to be more specific, placing elements with low melting points on the lower sides of copper crucibles during smelting and placing elements with high melting points on the upper sides of the copper crucibles; vacuumizing working cavities of the electric arc furnaces until the pressuresof the working cavities reach 5*10<-4> Pa; then filling the working cavities with high-purity argon with the purity of 99.99 wt.%; carrying out arc striking smelting to obtain the MoNbCrVTi refractoryhigh-entropy alloy. The purity of the elementary substances is not lower than 99.5 wt.%. The refractory high-entropy alloy and the method have the advantages that the refractory high-entropy alloy isof a simple monolithic centered cubic structure, is excellent in mechanical property, extremely high in strength and good in plasticity and has the possibility of potential application in high-temperature environments; the method is simple and feasible and has a broad application prospect.
Description
technical field [0001] The invention relates to the field of metal materials and their preparation, in particular to a refractory high-entropy alloy whose composition is MoNbCrVTi and a preparation method thereof. Background technique [0002] High-entropy alloy is a new type of metal material. The design concept of the alloy was proposed by Taiwan scholar Ye Junwei in the 1990s. This novel alloy design concept greatly expands the alloy design system and breaks through the design idea of using one or two elements as the main elements in the traditional alloy design. A high-entropy alloy in a broad sense means that the number of components of the alloy is ≥ 5, the components of the alloy are proportioned in an equimolar ratio, and the mole percentage of each element is between 5% and 35%. Because the alloy is not dominated by a certain element, high-entropy alloys are also called multi-principal alloys. [0003] Although there are many components in high-entropy alloys, a...
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IPC IPC(8): C22C30/00C22C1/03
Inventor 韩恩厚向超张志明王俭秋张海峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI