Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating

E. Wen Huang; Hung Sheng Chou; K. N. Tu; Wei Song Hung; Tu Ngoc Lam; Che Wei Tsai; Ching Yu Chiang; Bi Hsuan Lin; An Chou Yeh; Shan Hsiu Chang; Yao Jen Chang; Jun Jie Yang; Xiao Yun Li; Ching Shun Ku; Ke An; Yuan Wei Chang; Yu Lun Jao

doi:10.1038/s41598-019-51297-4

Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating

E. Wen Huang, Hung Sheng Chou, K. N. Tu, Wei Song Hung, Tu Ngoc Lam, Che Wei Tsai, Ching Yu Chiang, Bi Hsuan Lin, An Chou Yeh, Shan Hsiu Chang, Yao Jen Chang, Jun Jie Yang, Xiao Yun Li, Ching Shun Ku, Ke An, Yuan Wei Chang, Yu Lun Jao

Materials Engineering

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

40 Scopus citations

Abstract

We applied Simmons–Balluffi methods, positron measurements, and neutron diffraction to estimate the vacancy of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) using Cu as a benchmark. The corresponding formation enthalpies and associated entropies of the HEAs and Cu were calculated. The vacancy-dependent effective free volumes in both CoCrFeNi and CoCrFeMnNi alloys are greater than those in Cu, implying the easier formation of vacancies by lattice structure relaxation of HEAs at elevated temperatures. Spatially resolved synchrotron X-ray measurements revealed different characteristics of CoCrFeNi and CoCrFeMnNi HEAs subjected to quasi-equilibrium conditions at high temperatures. Element-dependent behavior revealed by X-ray fluorescence (XRF) mapping indicates the effect of Mn on the Cantor Alloy.

Original language	English
Article number	14788
Journal	Scientific Reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-51297-4
State	Published - Dec 1 2019

Funding

The authors thank the R&D Center for Membrane Technology, Chung Yuan University, for positron annihilation measurements. Research conducted at ORNL\u2019s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, United States Department of Energy. The authors are immensely grateful for the financial support of the National Synchrotron Radiation Research Center (NSRRC) and the Ministry of Science and Technology (MOST) programs (107-2628-E-009-001-MY3, 107-2218-E-007-012, and 108-2221-E-009-131-MY4). This work was financially supported by the \u201CHigh Entropy Materials Center\u201D from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and from Project MOST 107-3017-F-007-003 by MOST in Taiwan. E.W.H. and K.N.T. thank the \u201CCenter for Semiconductor Technology Research\u201D from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the MOE in Taiwan. This work was also supported in part by MOST, Taiwan, under grants MOST-107-3017-F-009-002 and MOST-108-3017-F-009-003.

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Huang, E. W., Chou, H. S., Tu, K. N., Hung, W. S., Lam, T. N., Tsai, C. W., Chiang, C. Y., Lin, B. H., Yeh, A. C., Chang, S. H., Chang, Y. J., Yang, J. J., Li, X. Y., Ku, C. S., An, K., Chang, Y. W., & Jao, Y. L. (2019). Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating. Scientific Reports, 9(1), Article 14788. https://doi.org/10.1038/s41598-019-51297-4

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title = "Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating",

abstract = "We applied Simmons–Balluffi methods, positron measurements, and neutron diffraction to estimate the vacancy of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) using Cu as a benchmark. The corresponding formation enthalpies and associated entropies of the HEAs and Cu were calculated. The vacancy-dependent effective free volumes in both CoCrFeNi and CoCrFeMnNi alloys are greater than those in Cu, implying the easier formation of vacancies by lattice structure relaxation of HEAs at elevated temperatures. Spatially resolved synchrotron X-ray measurements revealed different characteristics of CoCrFeNi and CoCrFeMnNi HEAs subjected to quasi-equilibrium conditions at high temperatures. Element-dependent behavior revealed by X-ray fluorescence (XRF) mapping indicates the effect of Mn on the Cantor Alloy.",

author = "Huang, {E. Wen} and Chou, {Hung Sheng} and Tu, {K. N.} and Hung, {Wei Song} and Lam, {Tu Ngoc} and Tsai, {Che Wei} and Chiang, {Ching Yu} and Lin, {Bi Hsuan} and Yeh, {An Chou} and Chang, {Shan Hsiu} and Chang, {Yao Jen} and Yang, {Jun Jie} and Li, {Xiao Yun} and Ku, {Ching Shun} and Ke An and Chang, {Yuan Wei} and Jao, {Yu Lun}",

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year = "2019",

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doi = "10.1038/s41598-019-51297-4",

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Huang, EW, Chou, HS, Tu, KN, Hung, WS, Lam, TN, Tsai, CW, Chiang, CY, Lin, BH, Yeh, AC, Chang, SH, Chang, YJ, Yang, JJ, Li, XY, Ku, CS, An, K, Chang, YW & Jao, YL 2019, 'Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating', Scientific Reports, vol. 9, no. 1, 14788. https://doi.org/10.1038/s41598-019-51297-4

TY - JOUR

T1 - Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating

AU - Huang, E. Wen

AU - Chou, Hung Sheng

AU - Tu, K. N.

AU - Hung, Wei Song

AU - Lam, Tu Ngoc

AU - Tsai, Che Wei

AU - Chiang, Ching Yu

AU - Lin, Bi Hsuan

AU - Yeh, An Chou

AU - Chang, Shan Hsiu

AU - Chang, Yao Jen

AU - Yang, Jun Jie

AU - Li, Xiao Yun

AU - Ku, Ching Shun

AU - An, Ke

AU - Chang, Yuan Wei

AU - Jao, Yu Lun

PY - 2019/12/1

Y1 - 2019/12/1

N2 - We applied Simmons–Balluffi methods, positron measurements, and neutron diffraction to estimate the vacancy of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) using Cu as a benchmark. The corresponding formation enthalpies and associated entropies of the HEAs and Cu were calculated. The vacancy-dependent effective free volumes in both CoCrFeNi and CoCrFeMnNi alloys are greater than those in Cu, implying the easier formation of vacancies by lattice structure relaxation of HEAs at elevated temperatures. Spatially resolved synchrotron X-ray measurements revealed different characteristics of CoCrFeNi and CoCrFeMnNi HEAs subjected to quasi-equilibrium conditions at high temperatures. Element-dependent behavior revealed by X-ray fluorescence (XRF) mapping indicates the effect of Mn on the Cantor Alloy.

AB - We applied Simmons–Balluffi methods, positron measurements, and neutron diffraction to estimate the vacancy of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) using Cu as a benchmark. The corresponding formation enthalpies and associated entropies of the HEAs and Cu were calculated. The vacancy-dependent effective free volumes in both CoCrFeNi and CoCrFeMnNi alloys are greater than those in Cu, implying the easier formation of vacancies by lattice structure relaxation of HEAs at elevated temperatures. Spatially resolved synchrotron X-ray measurements revealed different characteristics of CoCrFeNi and CoCrFeMnNi HEAs subjected to quasi-equilibrium conditions at high temperatures. Element-dependent behavior revealed by X-ray fluorescence (XRF) mapping indicates the effect of Mn on the Cantor Alloy.

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Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating

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