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On the compositional and structural redistribution during partial recrystallisation: a case of σ-phase precipitation in a Mo-doped NiCoCr medium-entropy alloy

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Wu,  Xiaoxiang
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Shagang School of Iron and Steel, Soochow University, Suzhou, 215137, China;

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Guo,  Yueling
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
School of Mechanical Engineering, Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, PR China;

/persons/resource/persons214406

Makineni,  Surendra Kumar
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Indian Institute of Science, Department of Materials Engineering, Bangalore, India;

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Citation

He, J., Wu, X., Guo, Y., & Makineni, S. K. (2021). On the compositional and structural redistribution during partial recrystallisation: a case of σ-phase precipitation in a Mo-doped NiCoCr medium-entropy alloy. Scripta Materialia, 194: 113662. doi:10.1016/j.scriptamat.2020.113662.


Cite as: https://hdl.handle.net/21.11116/0000-0009-71BA-6
Abstract
In this work, we discussed the atomic-scale mass transport occurring in a Mo-doped NiCoCr medium-entropy alloy to form σ-precipitates during partial recrystallization at 700°C. We reveal the segregation of Cr/Mo to the fault planes of nano-twins/stacking faults in non-recrystallized zones. Upon annealing, the migration of recrystallized grain boundaries (GBs) redistributes the structure and composition, leading to the annihilation of faults and leaving behind the Mo-rich σ-precursors for precipitation. The segregated Cr/Mo solutes can also diffuse to the moving GBs and create additional σ-nucleation sites. The present results highlight the role of Mo in overcoming strength-ductility trade-off of the alloy. © 2020