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Method for designing components of high-entropy alloy based on segregation condition among components

A high-entropy alloy and composition design technology, applied in the field of high-entropy alloy composition design, can solve problems that cannot be used to explain the formation of high-entropy alloys, single solid solution structure, etc.

Active Publication Date: 2016-09-21
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these are semi-empirical methods and cannot be used to explain why high-entropy alloys form a single solid solution structure

Method used

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  • Method for designing components of high-entropy alloy based on segregation condition among components
  • Method for designing components of high-entropy alloy based on segregation condition among components
  • Method for designing components of high-entropy alloy based on segregation condition among components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] VMoCrMn high entropy alloy

[0053] (1) Calculation of the interaction energy between elements: select V, Mo, Cr, Mn, the four transition group elements, and carry out alloying at an equal atomic ratio, and calculate the I between each component by the above formula (9) ij , and the calculation results are listed in Table 1.

[0054] Table 1 Interaction energy I between components ij (KJ·mol -1 )

[0055]

[0056] (2) Judging the segregation of components: Judging the segregation of components according to each interaction energy value: a) The interaction energy of all components in the high-entropy alloy with equal atomic ratio satisfies -I t ij t , I t I that forms a solid solution for the alloy ij The limit value of the alloy tends to form a solid solution with a single structure;

[0057] b) When there is an interaction energy I between components ij > I t , the segregation of similar components will appear in the alloy;

[0058] c) There is an interacti...

Embodiment 2

[0064] VMoCrAlMn high entropy alloy

[0065] (1) Calculation of the interaction energy between elements: select five elements V, Mo, Cr, Al, and Mn, alloy them in an equal atomic ratio, and calculate the I between each component by formula (9) ij , and the calculation results are listed in Table 2.

[0066] (2) Judging the segregation of components: judge according to the situation described in the examples.

[0067] In this embodiment, the interaction energy between each component of the composition has the I of Al-V and Al-Cr ij values ​​much less than zero, I AlV =-43.0KJ·mol -1 , I AlCr =-47.8KJ·mol -1 , so the alloy should precipitate a second phase or form a new solid solution phase between the grain boundaries.

[0068] (3) Composition design of the high-entropy alloy: design the composition of the high-entropy alloy according to the required structure, and the atomic percentages of each component are: V20%, Mo20%, Cr20%, Al20%, Mn20%, after conversion into weight...

Embodiment 3

[0072] NiMnFeCu High Entropy Alloy

[0073] (1) Calculation of the interaction energy between elements: select the four elements Ni, Mn, Fe, and Cu, alloy them with an equal atomic ratio, and calculate the I between each component by formula (9) ij , and the calculation results are listed in Table 3.

[0074](2) Judging the segregation of components: judge according to the situation described in the examples.

[0075] In this embodiment, only the I of Ni-Mn is included in the interaction energy between the components ij values ​​much less than zero, I NiMn =-44.3KJ·mol -1 , so the alloy should precipitate a second phase or form a new solid solution phase between the grain boundaries.

[0076] (3) Composition design of the high-entropy alloy: design the composition of the high-entropy alloy according to the desired structure, the atomic percentages of each component are: Ni25%, Mn25%, Fe25%, Cu25%, and the ingredients are converted into weight percentages. The present inve...

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Abstract

The invention relates to a method for designing components of a high-entropy alloy based on the segregation condition among components. According to the method disclosed by the invention, the segregation condition among various components is judged by calculating interaction energy among various elements, further specific elements are selected to accord with the corresponding interaction energy ranges and a high-entropy alloy with a specific structure is formed, thereby finishing the component design of the high-entropy alloy; and the method for quantitatively designing the components of the high-entropy alloy based on the interaction energy among the components is initiatively created, a calculation method of the interaction energy is given out, and the high-entropy alloy with the specific structure can be obtained. In addition, the method is simple and convenient in calculation, accurate and reliable; and the success rate of producing the high-entropy alloy with the specific structure is improved.

Description

technical field [0001] The invention belongs to the field of alloy composition design, and in particular relates to a method for high-entropy alloy composition design. technical background [0002] Traditional alloys follow this design concept: one or two metal elements are used as the main components, and other trace elements are added to improve the structure and performance. In 2004, after years of practical research, Taiwan scholar Ye Junwei proposed a high-entropy alloy that is completely different from the traditional alloy design concept. High-entropy alloys are no longer based on a certain element, but alloy multiple elements in the form of equiatomic ratio or approximately equiatomic ratio. With the development of high-entropy alloys, as long as the atomic percentage of each component is between 5% and 35%, such multi-component alloys are also considered high-entropy alloys. According to this brand-new multi-component alloy design concept, we can know that there a...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C30/02C22C1/02
CPCC22C1/02C22C9/06C22C27/04C22C30/00C22C30/02
Inventor 湛永钟叶海梅唐铖锽丁晓龙柳帅杜再翔张建峰陈晓娴吴俊彦
Owner GUANGXI UNIV
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