Room-Temperature Superformability in Novel As-Cast High-Entropy Alloy During Compressive Loading

Dutta, A and Tung, S-Y and Gupta, SK and Tsai, M-H and Nene, SS (2022) Room-Temperature Superformability in Novel As-Cast High-Entropy Alloy During Compressive Loading. In: Advanced Engineering Materials .

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Abstract

Conventional alloys show low compressive strength and strain accommodation due to their propensity for limited strengthening mechanisms and rapid compressive instability. High-entropy alloys (HEA) may overcome this limitation by metastability engineering. Inspired by this, herein, a dual-phase Fe44Mn20Cr15Ni7.5Co6Si7.5 HEA (M-HEA) which shows maximum engineering strength of ≈4.4 GPa at true compressive strain of ≈2.2 (engineering strain of 90%) in as-cast condition due to controlled hardening and sustained softening response during deformation is presented. The controlled hardening phenomenon (up to 60% strain) is attributed to transformation-induced plasticity in γ-phase and nanotwinning in untransformed γ-phase. The sustained softening is a result of extensive strain accommodation by both γ- and β-phases via dynamic recovery in γ-phase and shearing of β-phase during deformation. Hence, this superformability in M-HEA makes it an excellent material for structural applications in comparison with other conventional alloys and HEAs.

Item Type:	Journal Article
Publication:	Advanced Engineering Materials
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	Compression testing; Deformation; Entropy; Formability; Hardening; High-entropy alloys; Metastable phases; Silicon alloys; Twinning, As-cast; Compression test; Compressive loading; Compressive strain; Conventional alloys; High entropy alloys; Low compressive strengths; Metastable phase; Strain accommodations; Strengthening mechanisms, Compressive strength
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Jan 2023 05:45
Last Modified:	04 Jan 2023 05:45
URI:	https://eprints.iisc.ac.in/id/eprint/78706

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