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Quenching of High Entropy Alloys after Annealing

Abbasi, Erfan
Dehghani, Kamran
Sajadifar, Seyed Vahid
Niendorf, Thomas

The effect of cooling rate after annealing at 900 °C on the microstructure and hardness of high entropy alloys was investigated using two typical samples with the chemical composition of Co₁₆Cr₁₄.₅Fe₂₉Mn₁₁.₅Ni₂₉ and Co₁₁.₅Cr₇Fe₂₇Mn₂₇Ni₂₇(Nb₀.₀₈C₀.₅) (at%). The microstructural characterisation and hardness measurements were carried out by optical microscopy, scanning electron microscopy, wavelength-dispersive X-ray spectroscopy, electron back scattered diffraction, X-ray diffraction technique and Vickers hardness testing. A face centred cubic crystal structure matrix was observed in both alloys before and after annealing and regardless of cooling conditions. SEM analyses revealed an extensive precipitation in Co₁₁.₅Cr₇Fe₂₇Mn₂₇Ni₂₇ (Nb₀.₀₈C₀.₅) alloy after annealing. It was also found that air/furnace cooling can enhance grain growth-coarsening just in Co₁₆Cr₁₄.₅Fe₂₉Mn₁₁.₅Ni₂₉. However, the hardness results generally showed insignificant hardness variations in both alloys after water-quenching, air-cooling and furnace-cooling. The results suggested that the hardness is mainly controlled by solid solution strengthening.

Citation
In: Iranian Journal of Materials Science and Engineering Volume 17 / Issue 4 (2020) , S. ; eissn:2383-3882
Collections
@article{doi:10.17170/kobra-202304217870,
  author    ={Abbasi, Erfan and Dehghani, Kamran and Sajadifar, Seyed Vahid and Niendorf, Thomas},
  title    ={Quenching of High Entropy Alloys after Annealing},
  keywords ={600 and Mikrostruktur and Legierung},
  copyright  ={http://creativecommons.org/licenses/by-nc/4.0/},
  language ={en},
  journal  ={Iranian Journal of Materials Science and Engineering},
  year   ={2020}
}