Comparing cyclic tension-compression effects on CoCrFeMnNi high-entropy alloy and Ni-based superalloy

Tu Ngoc Lam, You Shiun Chou, Yao Jen Chang, Tsung Ruei Sui, An Chou Yeh, Stefanus Harjo, Soo Yeol Lee*, Jayant Jain, Bo Hong Lai, E-Wen Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

An equal-molar CoCrFeMnNi, face-centered-cubic (fcc) high-entropy alloy (HEA) and a nickel-based superalloy are studied using in situ neutron diffraction experiments. With continuous measurements, the evolution of diffraction peaks is collected for microscopic lattice strain analyses. Cyclic hardening and softening are found in both metallic systems. However, as obtained from the diffraction-peak-width evolution, the underneath deformation mechanisms are quite different. The CoCrFeMnNi HEA exhibits distinct lattice strain and microstructure responses under tension-compression cyclic loadings.

Original languageEnglish
Article number420
Number of pages8
JournalCrystals
Volume9
Issue number8
DOIs
StatePublished - Aug 2019

Keywords

  • in-situ neutron diffraction
  • low-cycle fatigue
  • high entropy alloy
  • Ni-based superalloy
  • CRACK GROWTH-BEHAVIOR
  • FATIGUE BEHAVIOR
  • NEUTRON-DIFFRACTION
  • DEFORMATION
  • TEMPERATURE
  • DISLOCATION
  • EVOLUTION
  • STRESS
  • METALS

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    Lam, T. N., Chou, Y. S., Chang, Y. J., Sui, T. R., Yeh, A. C., Harjo, S., Lee, S. Y., Jain, J., Lai, B. H., & Huang, E-W. (2019). Comparing cyclic tension-compression effects on CoCrFeMnNi high-entropy alloy and Ni-based superalloy. Crystals, 9(8), [420]. https://doi.org/10.3390/cryst9080420, https://doi.org/10.3390/cryst9080420