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

*Corresponding author for this work

Research output: Contribution to journalArticle

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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 languageEnglish
Article number14788
Number of pages10
JournalScientific reports
Volume9
DOIs
StatePublished - 15 Oct 2019

Keywords

  • THERMAL-EXPANSION
  • TEMPERATURE-DEPENDENCE
  • POSITRON LIFETIMES
  • MICROSTRUCTURE
  • ANNIHILATION
  • PHASE
  • STABILITY

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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, [14788]. https://doi.org/10.1038/s41598-019-51297-4