Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (7): 933-938.DOI: 10.12068/j.issn.1005-3026.2021.07.004

• Materials & Metallurgy • Previous Articles     Next Articles

Microstructure Evolution and Recrystallization Kinetics of CoCrFeNi High Entropy Alloy

BI Meng-yuan, XIE Ren-yi, ZHANG Yi-fan, YI Hai-long   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Revised:2020-12-21 Accepted:2020-12-21 Published:2021-07-16
  • Contact: YI Hai-long
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Abstract: Using a Gleeble-1500D thermal simulator, the non-equal molar CoCrFeNi high entropy alloy doped with minor carbon was conducted by hot deformation under different deformation conditions. The results show that when the temperature is 1123K and strain rate is 0.1s-1, the microstructure is mainly composed of deformed grains. With the increase of temperature or decrease of strain rate, fine grains start to appear at the deformed grains edge. When the temperature increases to 1223K, all microstructure is transformed to equiaxed recrystallization grains. When the temperature is higher than 1223K, the grains become coarse. Arrhenius model and Avrami equation were used to build the kinetic model of recrystallization, and the activation energy was obtained as 526.078kJ/mol.

Key words: high entropy alloy; hot deformation; microstructure; recrystallization kinetics; activation energy

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