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 and Wu, X and Guo, Y and Makineni, SK (2021) On the compositional and structural redistribution during partial recrystallisation: a case of σ-phase precipitation in a Mo-doped NiCoCr medium-entropy alloy. In: Scripta Materialia, 194 .

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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

Item Type:	Journal Article
Publication:	Scripta Materialia
Publisher:	Acta Materialia Inc
Additional Information:	The copyright for this article belongs to Acta Materialia Inc.
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
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	24 Feb 2023 04:53
Last Modified:	24 Feb 2023 04:53
URI:	https://eprints.iisc.ac.in/id/eprint/80446

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