High-entropy alloy of double-layer close-packed hexagonal structure
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A technology of close-packed hexagonal and high-entropy alloys is applied in the field of double-layer close-packed hexagonal structure high-entropy alloys to achieve the effect of promoting application
Active Publication Date: 2020-05-19
YANSHAN UNIV
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The heavy rare earth high-entropy alloy YGdDyHoTb has a similar phase transition process under high pressure, however, high-entropy alloys formed entirely of light rare earth elements and their phase structures under high pressure are rarely reported
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Embodiment 1
[0032] Embodiment one (as figure 1 , image 3 )
[0033] A high-entropy alloy with double-layer close-packed hexagonal structure, whose composition is La x Ce x PR x Nd x , where x is the atomic percentage x=25. La x Ce x PR x Nd x The alloy has two structures of face-centered cubic (fcc) and twisted face-centered cubic (dfcc) under high pressure.
[0034] High entropy alloy La with double-layer close-packed hexagonal structure 25 Ce 25 PR 25 Nd 25 The preparation method is as follows:
[0035] (1) Weigh La: 25%, Ce: 25%, Pr: 25%, Nd: 25% as raw materials according to equal atomic percentage, and the purity of the above light rare earth metals is in the range of 99.5wt%-99.9wt%;
[0036] (2) Mix the above raw material components evenly and put them into a high vacuum arc melting furnace for melting, and carry out melting under the protective atmosphere of high-purity argon gas. During the melting process, the alloy ingot is repeatedly turned over 4 to 5 times to...
Embodiment 2
[0041] Embodiment two (as figure 2 , Figure 4 )
[0042] A high-entropy alloy with double-layer close-packed hexagonal structure, whose composition is La x Ce x PR x Nd x SM x , where x is the atomic percentage x=20. High entropy alloy La with double-layer close-packed hexagonal structure 20 Ce 20 PR 20 Nd 20 SM 20 , under high pressure, have two structures of face-centered cubic (fcc) and twisted face-centered cubic (dfcc).
[0043] High entropy alloy La with double-layer close-packed hexagonal structure 20 Ce 20 PR 20 Nd 20 SM 20 The preparation method is as follows:
[0044] (1) Weigh La: 20%, Ce: 20%, Pr: 20%, Nd: 20%, Sm: 20% with a purity of 99.5wt%-99.9wt% according to the equal atomic percentage as raw materials;
[0045] (2) The above-mentioned raw material components are mixed evenly and put into a high-vacuum electric arc melting furnace for smelting, smelting is carried out for 4 to 5 times under a protective atmosphere of high-purity argon, and...
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Abstract
The invention discloses a high-entropy alloy of a double-layer close-packed hexagonal structure, and belongs to the technical field of rare earth alloy materials. The high-entropy alloy of the double-layer close-packed hexagonal structure is LaxCexPrxNdx, wherein x is atomic number percentage and is equal to 25; or the high-entropy alloy is LaxCexPrxNdxSmx, wherein the atomic number percentage x is equal to 20. The high-entropy alloy is prepared through smelting by means of a high-vacuum arc smelting furnace under high-purity argon protection conditions. The high-entropy alloy is prepared fromlight rare earth elemental lanthanum, cerium, praseodymium, neodymium and samarium (La, Ce, Pr, Nd and Sm). The X-ray diffraction spectrum of the high-entropy alloy is obtained through an X-ray diffractometer, and it is confirmed that the crystal structure of the prepared light rare earth high-entropy alloy is the double-layer close-packed hexagonal structure. The in-situ high-pressure synchronous radiation X-ray technology is utilized to confirm that the alloy has face-centered cubic (fcc) and distorted face-centered cubic (dfcc) high-voltage phase structures at high pressure.
Description
technical field [0001] The invention relates to the technical field of rare earth alloy materials, in particular to a double-layer close-packed hexagonal structure high-entropy alloy completely composed of light rare earth. Background technique [0002] Rare earth elements have similar crystal structures, similar atomic radii, and electronegativity, and can form infinite solid solution alloys with each other. Therefore, by alloying rare earth elements at equal atomic percentages, rare earth high-entropy alloys can be obtained, which have excellent magnetic properties and are good magnetic refrigeration materials, which have attracted extensive attention from material scientists. According to the atomic and electronic layer structure and physical and chemical properties of rare earth elements, as well as their symbiosis in minerals and different ionic radii that can produce different properties, the seventeen rare earth elements are usually divided into two groups: light rare...
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