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.

Details

Title
Element Effects on High-Entropy Alloy Vacancy and Heterogeneous Lattice Distortion Subjected to Quasi-equilibrium Heating
Author
E-Wen, Huang 1   VIAFID ORCID Logo  ; Hung-Sheng Chou 2   VIAFID ORCID Logo  ; Tu, K N 3 ; Wei-Song, Hung 4 ; Tu-Ngoc Lam 5 ; Che-Wei, Tsai 6 ; Ching-Yu, Chiang 7 ; Bi-Hsuan Lin 7 ; An-Chou Yeh 6 ; Chang, Shan-Hsiu 6 ; Yao-Jen, Chang 6 ; Jun-Jie, Yang 6 ; Xiao-Yun, Li 7 ; Ching-Shun Ku 7 ; An, Ke 8   VIAFID ORCID Logo  ; Yuan-Wei, Chang 1 ; Yu-Lun Jao 1 

1  Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan 
2  Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, Taiwan 
3  Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan; Department of Materials Science and Engineering, University of California, Los Angeles, United States 
4  Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; R&D Center for Membrane Technology, Chung Yuan University, Taoyuan, Taiwan 
5  Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan; Department of Physics, College of Education, Can Tho University, Can Tho City, Vietnam 
6  Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan 
7  National Synchrotron Radiation Research Center, Hsinchu, Taiwan 
8  Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, United States 
Pages
1-10
Publication year
2019
Publication date
Oct 2019
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-019-51297-4
ProQuest document ID
2305794653
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.