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Preparation method for Al-Si-Mn-Fe-Ga high-entropy decagonal quasicrystal

A technology of al-si-mn-fe-ga, al20si20mn20fe20ga20, which is applied in the field of preparing Al-Si-Mn-Fe-Ga high-entropy ten-order quasicrystal, and achieves the effect of simple preparation method

Active Publication Date: 2020-04-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although scholars have done research on the preparation of high-entropy quasicrystals, due to the particularity and complexity of the quasicrystal structure, it is a huge challenge to prepare a high-entropy quasicrystal with complex structure and composition.

Method used

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  • Preparation method for Al-Si-Mn-Fe-Ga high-entropy decagonal quasicrystal
  • Preparation method for Al-Si-Mn-Fe-Ga high-entropy decagonal quasicrystal
  • Preparation method for Al-Si-Mn-Fe-Ga high-entropy decagonal quasicrystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1)Al 20 Si 20 mn 20 Fe 20 Ga 20 Preparation of High Entropy Alloy Flakes

[0031] First, the metal Al (99.99%), Si (99.99%), Mn (99.99%), Fe (99.99%), Ga (99.99%), according to the atomic ratio of 20:20:20:20:20 ingredients, select vacuum Melting in an induction melting furnace with a rated temperature of 1700°C to obtain Al 20 Si 20 mn 20 Fe 20 Ga 20 High-entropy alloy ingot 2Kg.

[0032] 2) Take a small amount of smelted Al 20 Si 20 mn 20 Fe 20 Ga 20 High-entropy alloy ingots, smashed into small pieces with a diameter of about 1cm.

[0033] 3) Take 70 g of the massive high-entropy alloy with a diameter of about 1 cm prepared in step 2), and use a vacuum strip-spinning machine to prepare a rapidly solidified strip-spin sheet at a roll speed of 25 m / s. High-entropy decaquasicrystals were obtained.

[0034] According to 3) the Al prepared by the method described 20 Si 20 mn 20 Fe 20 Ga 20 XRD pattern of high entropy alloy flakes figure 1 As shown, ...

Embodiment 2

[0040] 1)Al 20 Si 20 mn 20 Fe 20 Ga 20 Preparation of High Entropy Alloy Flakes

[0041] First, the metal Al (99.99%), Si (99.99%), Mn (99.99%), Fe (99.99%), Ga (99.99%), according to the atomic ratio of 20:20:20:20:20 ingredients, select vacuum Melting in an induction melting furnace with a rated temperature of 1700°C to obtain Al 20 Si 20 mn 20 Fe 20 Ga 20 High-entropy alloy ingot 2Kg.

[0042] 2) Take a small amount of smelted Al 20 Si 20 mn 20 Fe 20 Ga 20 High-entropy alloy ingots, smashed into small pieces with a diameter of about 1cm.

[0043] 3) Take 70 g of the massive high-entropy alloy with a diameter of about 1 cm prepared in step 2), and use a vacuum strip-spinning machine to prepare a rapidly solidified strip-spin sheet at a roll speed of 10 m / s. High-entropy decaquasicrystals were obtained.

[0044] 4) if Figure 6 Shown in (b) is the selected-area electron diffraction pattern of ten times quasicrystals found in the flake strip alloy prepared in...

Embodiment 3

[0046] 1)Al 20 Si 20 mn 20 Fe 20 Ga 20 Preparation of High Entropy Alloy Flakes

[0047] First, the metal Al (99.99%), Si (99.99%), Mn (99.99%), Fe (99.99%), Ga (99.99%), according to the atomic ratio of 20:20:20:20:20 ingredients, select vacuum Melting in an induction melting furnace with a rated temperature of 1700°C to obtain Al 20 Si 20 mn 20 Fe 20 Ga 20 High-entropy alloy ingot 2Kg.

[0048] 2) Take a small amount of smelted Al 20 Si 20 mn 20 Fe 20 Ga 20 High-entropy alloy ingots, smashed into small pieces with a diameter of about 1cm.

[0049] 3) Take 70 g of the massive high-entropy alloy with a diameter of about 1 cm prepared in step 2), and use a vacuum strip-spinning machine to prepare a rapidly solidified strip-spin sheet at a roll speed of 35 m / s. High-entropy decaquasicrystals were obtained.

[0050] 4) if Figure 6 Shown in (c) is the selected area electron diffraction pattern of ten times quasicrystals found in the flake strip alloy prepared in...

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Abstract

The invention provides a preparation method for an Al-Si-Mn-Fe-Ga high-entropy decagonal quasicrystal. By using the design thought that structural blocks in the decagonal quasicrystal are similar, thehigh-entropy decagonal quasicrystal containing Al21Si19Mn21Fe26Ga13 is prepared in an Al20Si20Mn20Fe20Ga20 alloy strip. The decagonal quasicrystal contains five elements, the ratio of the elements isclose to an equiatomic ratio, and the definition of the high-entropy alloy based on the compositions is met. By considering an entropy value, the configurational entropy of the high-entropy decagonalquasicrystal is 1.59R which is higher than the entropy criterion 1.5 R of a high-entropy quasicrystal, the definition of the high-entropy based on the entropy value is met, and therefore, the decagonal quasicrystal is high in entropy. The preparation method has the advantages that by using the characteristic that the structural blocks in different quasicrystal alloy systems are similar, the multi-element high-entropy decagonal quasicrystal is successfully prepared for the first time, and the blank in the phase structure of the high-entropy alloy is filled up. The structural characteristics ofthe high-entropy decagonal quasicrystal are further disclosed in the atomic level by using a high-atomic-resolution annular-dark-field scanning transmission electron microscope, and a new thought isprovided for the later composition design of high-entropy decagonal quasicrystals.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys and quasicrystals, and in particular relates to a method for preparing Al-Si-Mn-Fe-Ga high-entropy decadal quasicrystals [0002] technical background [0003] Shechtman discovered icosahedral quasicrystals in quenched Al-Mn alloys in 1984. So far, a large number of quasicrystals have been reported and confirmed. They mainly exist in binary and ternary aluminum-based alloys, where the aluminum content is generally 60-75%. In addition, quasicrystals also exist in Mg-based and Ga-based alloys, most of which are alloy phases dominated by one element. [0004] High-entropy alloys (HEAs) were first independently reported by Yeh et al and Cantor in 2004. Different from the traditional alloy design concept, HEAs is a multi-principal alloy. The definition based on the element composition is that the high-entropy alloy consists of 5 or more components, and the content between each component i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02B22D11/06
CPCB22D11/0611C22C1/02C22C30/00C22C2200/06
Inventor 何战兵赵良群苗定豪马海坤
Owner UNIV OF SCI & TECH BEIJING
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