Excellent work hardening ability in a novel compositionally complex alloy by hierarchical microstructuring

Dutta, A and Gupta, SK and Gumaste, A and Haridas, RS and Suwas, S and Mishra, RS and Nene, SS (2024) Excellent work hardening ability in a novel compositionally complex alloy by hierarchical microstructuring. In: Applied Materials Today, 39 (102300).

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Abstract

Strength and ductility vary inversely due to a rapid decrease in dislocation storage capacity with the pronounced increase in work hardening rate at the expense of ductility in most conventional and recently designed advanced ductile materials. This limitation can be overcome by creating heterogenous or hierarchical microstructures containing not only presence but also different length scales of twins, bands, phases synergistically. In line of that, here we present Fe44Mn20Cr15Ni7.5Co6Si7.5 (all in at.) compositionally complex alloy (M-CCA), which showed an exceptional increase in strength and ductility simultaneously as a result of hierarchical microstructuring that forms after conventional thermo-mechanical treatment. The increase in strength-ductility synergy is attributed to the occurrence of hetero-deformation induced (HDI) strengthening in early stage of deformation whereas planar slip assisted hetero-deformation banding, and deformation twinning in later stages of deformation during plastic straining. Hence, hierarchical microstructuring in M-CCA resulted in exceptional work hardening ability which is needed for structural integrity and manufacturing applications under tensile loads to suppress sudden failures during service. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Applied Materials Today
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Chromium alloys; Cobalt alloys; Ductile fracture; Ductility; Iron alloys; Silicon, Annealing; Complex alloys; Compositionally complex alloy; Deformation banding; Deformation twinning; Hetero-deformation banding; Hetero-deformation induced stress; Induced stress; Micro structuring; Strength and ductilities, Strain hardening
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	24 Sep 2024 11:16
Last Modified:	24 Sep 2024 11:16
URI:	http://eprints.iisc.ac.in/id/eprint/85696

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