Crystals (Jan 2022)

Tensile Response of As-Cast CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

  • Tu-Ngoc Lam,
  • Mao-Yuan Luo,
  • Takuro Kawasaki,
  • Stefanus Harjo,
  • Jayant Jain,
  • Soo-Yeol Lee,
  • An-Chou Yeh,
  • E-Wen Huang

DOI
https://doi.org/10.3390/cryst12020157
Journal volume & issue
Vol. 12, no. 2
p. 157

Abstract

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In this research, we systematically investigated equiatomic CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs). Both of these HEA systems are single-phase, face-centered-cubic (FCC) structures. Specifically, we examined the tensile response in as-cast quaternary CoCrFeNi and quinary CoCrFeMnNi HEAs at room temperature. Compared to CoCrFeNi HEA, the elongation of CoCrFeMnNi HEA was 14% lower, but the yield strength and ultimate tensile strength were increased by 17% and 6%, respectively. The direct real-time evolution of structural defects during uniaxial straining was acquired via in situ neutron-diffraction measurements. The dominant microstructures underlying plastic deformation mechanisms at each deformation stage in as-cast CoCrFeNi and CoCrFeMnNi HEAs were revealed using the Convolutional Multiple Whole Profile (CMWP) software for peak-profile fitting. The possible mechanisms are reported.

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