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

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

doi:10.1038/s41598-019-51297-4

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

Journal Article · Tue Oct 15 00:00:00 EDT 2019 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-019-51297-4· OSTI ID:1624499

^[1];

^[2]; Tu, K. N. ^[3]; Hung, Wei-Song ^[4]; Lam, Tu-Ngoc ^[5]; Tsai, Che-Wei ^[6]; Chiang, Ching-Yu ^[7]; Lin, Bi-Hsuan ^[7]; Yeh, An-Chou ^[6]; Chang, Shan-Hsiu ^[6]; Chang, Yao-Jen ^[6]; Yang, Jun-Jie ^[6]; Li, Xiao-Yun ^[7]; Ku, Ching-Shun ^[7];

^[8]; Chang, Yuan-Wei ^[1]; Jao, Yu-Lun ^[1]

National Chiao Tung Univ., Hsinchu (Taiwan)
National Sun Yat-sen Univ., Kaohsiung (Taiwan)
National Chiao Tung Univ., Hsinchu (Taiwan); Univ. of California, Los Angeles, CA (United States)
National Taiwan Univ. of Science and Technology, Taipei (Taiwan); Chung Yuan Univ., Taoyuan (Taiwan)
National Chiao Tung Univ., Hsinchu (Taiwan); Can Tho Univ. (Vietnam)
National Tsing Hua Univ., Hsinchu (Taiwan)
National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1624499

Journal Information:: Scientific Reports, Vol. 9, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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