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Unconventional energetics of small vacancy clusters in BCC high-entropy alloy Nb0.75ZrTiV0.5

文献类型：期刊论文

作者Shi, Tan; Qiu, Xi; Zhou, Yundi; Lyu, Sixin; Li, Jing; Sun, Dan; 彭庆, Qing; Xin, Yong; Lu, Chenyang
刊名JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
出版日期2023-05
卷号146页码:61-71
关键词Refractory high-entropy alloys Small vacancy clusters First-principles calculations Defect energetics Radiation defect evolution
ISSN号1005-0302
DOI10.1016/j.jmst.2022.11.008
英文摘要The stability of small vacancy clusters including divacancy, trivacancy and tetravacancy has been stud-ied in body-centered cubic high-entropy alloy Nb0.75ZrTiV0.5 in structures of random solid solution and short-range order by first-principles calculations and molecular dynamics simulations. Different from con-ventional body-centered cubic metals, the tightly bound configurations have a lower structural stability and are not preferred energetically in the studied high-entropy alloy. Instability of vacancy configurations leads to vacancy-atom exchanges that favor less compact configurations. The formation energy of small vacancy clusters is much smaller than its constituent elements of Nb and V due to the large structural adjustment induced by severe local lattice distortion. The difference in local lattice distortion and elemen-tal arrangement in the vacancy neighborhood leads to significant site-to-site variation in vacancy cluster energy and configuration. The formation energy has a strong correlation with the local energy state of the vacancy configuration and the extent of structural relaxation. Compared to random solid solution, the structure of short-range order has a higher stability for the most compact cluster configurations and tends to have higher vacancy cluster formation energy. According to classical molecular dynamics simu-lations of cluster diffusion at high temperature, the studied high-entropy alloy has a higher probability of cluster dissociation compared to Nb and V. The unconventional energetics of small vacancy clusters is expected to have a profound impact on their generation, diffusion, dissociation, coalescence, as well as the defect microstructure evolution during irradiation.(c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
分类号一类
WOS研究方向WOS:000961082700001
语种英语
资助机构National Key Research and Development Program of China [2019YFA0209900] ; National Natural Science Foundation of China [12075179, 12105219] ; China Postdoctoral Science Foundation [2021M702583] ; Innovative Scientific Program of China National Nuclear Corporation ; Innovation Program of Nuclear Power Institute of China [KJCX-2022-1-04] ; Chinese Academy of Sciences [E1Z1011001]
其他责任者Xin, Y ; Lu, CY
源URL[http://dspace.imech.ac.cn/handle/311007/92255]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.(Peng Qing) Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China
2.(Qiu Xi, Sun Dan, Xin Yong, Lu Chenyang) Nucl Power Inst China Chengdu 610213 Peoples R China
3.(Shi Tan, Zhou Yundi, Lyu Sixin, Li Jing, Xin Yong, Lu Chenyang) Xi An Jiao Tong Univ Sch Nucl Sci & Technol Xian 710049 Peoples R China
4.(Lu Chenyang) Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China
5.(Peng Qing) Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China
推荐引用方式
GB/T 7714		 Shi, Tan,Qiu, Xi,Zhou, Yundi,et al. Unconventional energetics of small vacancy clusters in BCC high-entropy alloy Nb0.75ZrTiV0.5[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2023,146:61-71.
APA Shi, Tan.,Qiu, Xi.,Zhou, Yundi.,Lyu, Sixin.,Li, Jing.,...&Lu, Chenyang.(2023).Unconventional energetics of small vacancy clusters in BCC high-entropy alloy Nb0.75ZrTiV0.5.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,146,61-71.
MLA Shi, Tan,et al."Unconventional energetics of small vacancy clusters in BCC high-entropy alloy Nb0.75ZrTiV0.5".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 146(2023):61-71.

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来源：力学研究所

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