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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

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.

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 Creators:
He, Junyang1, Author              
Wu, Xiaoxiang2, 3, Author              
Guo, Yueling2, 4, Author              
Makineni, Surendra Kumar5, 6, Author              
Affiliations:
1State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China, ou_persistent22              
2High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
3Shagang School of Iron and Steel, Soochow University, Suzhou, 215137, China, ou_persistent22              
4School of Mechanical Engineering, Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, PR China, ou_persistent22              
5Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
6Indian Institute of Science, Department of Materials Engineering, Bangalore, India, ou_persistent22              

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Free keywords: Cobalt alloys; Economic and social effects; Entropy; Grain boundaries; Precipitation (chemical); Recrystallization (metallurgy); Ternary alloys, Atomic scale; Fault planes; Medium entropy; Nucleation sites; Partial recrystallization; Recrystallisation; Recrystallized grains; Sigma-phase precipitation, Chromium alloys
 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

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Language(s): eng - English
 Dates: 2021-03-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.scriptamat.2020.113662
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Title: Scripta Materialia
  Abbreviation : Scripta Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B. V.
Pages: - Volume / Issue: 194 Sequence Number: 113662 Start / End Page: - Identifier: ISSN: 1359-6462
CoNE: https://pure.mpg.de/cone/journals/resource/954926243506