Transformation of chemical ordering and configuration entropy in quaternary CrxTi0.75Mo0.75V1.5-xAlC2MAX system

Yaqing Xue; Hong Yu; Hongwei Liang; Xiaomei Wang; Lili Xue; Shiyao Lei; Conghui Meng; Long Wang; Cheng Feng Du

doi:10.26599/JAC.2024.9220983

Transformation of chemical ordering and configuration entropy in quaternary Cr_xTi_0.75Mo_0.75V_1.5-xAlC₂MAX system

Yaqing Xue, Hong Yu, Hongwei Liang, Xiaomei Wang, Lili Xue, Shiyao Lei, Conghui Meng, Long Wang, Cheng Feng Du

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Two new quaternary CrxTi0.75Mo0.75V1.5-xAlC2 (x = 1.25 and 1) MAXs and Cr0.75Ti0.75Mo0.75V0.75AlC2 are synthesized via hot pressing. An unprecedented transition in M-site atomic occupancy from out-of-plane order to solid solution is observed along with composition variation, which also increases the configurational entropy from medium- to high-entropy. Through experimental observations and theoretical calculations, the influence of the atomic distribution on the material properties is analyzed. Eventually, an approximately 40% increase in the Vickers hardness compared with that of Cr2TiAlC2 and a low thermal conductivity are detected for the three MAXs, which can be attributed to the solid solution strengthening effects and the enhanced scattering of both electrons and phonons from the high-entropy structure.

Original language	English
Pages (from-to)	1861-1871
Number of pages	11
Journal	Journal of Advanced Ceramics
Volume	13
Issue number	11
DOIs	https://doi.org/10.26599/JAC.2024.9220983
State	Published - Nov 2024

Keywords

chemical order
MAX phase ceramics
mechanical property
medium-high entropy
thermal conductivity

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title = "Transformation of chemical ordering and configuration entropy in quaternary CrxTi0.75Mo0.75V1.5-xAlC2MAX system",

abstract = "Two new quaternary CrxTi0.75Mo0.75V1.5-xAlC2 (x = 1.25 and 1) MAXs and Cr0.75Ti0.75Mo0.75V0.75AlC2 are synthesized via hot pressing. An unprecedented transition in M-site atomic occupancy from out-of-plane order to solid solution is observed along with composition variation, which also increases the configurational entropy from medium- to high-entropy. Through experimental observations and theoretical calculations, the influence of the atomic distribution on the material properties is analyzed. Eventually, an approximately 40% increase in the Vickers hardness compared with that of Cr2TiAlC2 and a low thermal conductivity are detected for the three MAXs, which can be attributed to the solid solution strengthening effects and the enhanced scattering of both electrons and phonons from the high-entropy structure.",

keywords = "chemical order, MAX phase ceramics, mechanical property, medium-high entropy, thermal conductivity",

author = "Yaqing Xue and Hong Yu and Hongwei Liang and Xiaomei Wang and Lili Xue and Shiyao Lei and Conghui Meng and Long Wang and Du, {Cheng Feng}",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",

year = "2024",

month = nov,

doi = "10.26599/JAC.2024.9220983",

language = "英语",

volume = "13",

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journal = "Journal of Advanced Ceramics",

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T1 - Transformation of chemical ordering and configuration entropy in quaternary CrxTi0.75Mo0.75V1.5-xAlC2MAX system

AU - Xue, Yaqing

AU - Yu, Hong

AU - Liang, Hongwei

AU - Wang, Xiaomei

AU - Xue, Lili

AU - Lei, Shiyao

AU - Meng, Conghui

AU - Wang, Long

AU - Du, Cheng Feng

N1 - Publisher Copyright: © The Author(s) 2024.

PY - 2024/11

Y1 - 2024/11

N2 - Two new quaternary CrxTi0.75Mo0.75V1.5-xAlC2 (x = 1.25 and 1) MAXs and Cr0.75Ti0.75Mo0.75V0.75AlC2 are synthesized via hot pressing. An unprecedented transition in M-site atomic occupancy from out-of-plane order to solid solution is observed along with composition variation, which also increases the configurational entropy from medium- to high-entropy. Through experimental observations and theoretical calculations, the influence of the atomic distribution on the material properties is analyzed. Eventually, an approximately 40% increase in the Vickers hardness compared with that of Cr2TiAlC2 and a low thermal conductivity are detected for the three MAXs, which can be attributed to the solid solution strengthening effects and the enhanced scattering of both electrons and phonons from the high-entropy structure.

AB - Two new quaternary CrxTi0.75Mo0.75V1.5-xAlC2 (x = 1.25 and 1) MAXs and Cr0.75Ti0.75Mo0.75V0.75AlC2 are synthesized via hot pressing. An unprecedented transition in M-site atomic occupancy from out-of-plane order to solid solution is observed along with composition variation, which also increases the configurational entropy from medium- to high-entropy. Through experimental observations and theoretical calculations, the influence of the atomic distribution on the material properties is analyzed. Eventually, an approximately 40% increase in the Vickers hardness compared with that of Cr2TiAlC2 and a low thermal conductivity are detected for the three MAXs, which can be attributed to the solid solution strengthening effects and the enhanced scattering of both electrons and phonons from the high-entropy structure.

KW - chemical order

KW - MAX phase ceramics

KW - mechanical property

KW - medium-high entropy

KW - thermal conductivity

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U2 - 10.26599/JAC.2024.9220983

DO - 10.26599/JAC.2024.9220983

M3 - 文章

AN - SCOPUS:85212661720

SN - 2226-4108

VL - 13

SP - 1861

EP - 1871

JO - Journal of Advanced Ceramics

JF - Journal of Advanced Ceramics

IS - 11

ER -

Transformation of chemical ordering and configuration entropy in quaternary Cr_xTi_0.75Mo_0.75V_1.5-xAlC₂MAX system

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