Evolution of Substructure of a Non-equiatomic FeMnCrCo High Entropy Alloy Deformed at Ambient Temperature
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TRODUCTION
HIGH Entropy Alloy (HEA) is a new class of engineering materials, which offer a wide spectrum for alloy design, versatile microstructure, and unique properties. Since their advent more than a decade ago,[1–3] HEAs produced through various routes have shown attractive properties over conventional engineering materials, such as ultrahigh fracture toughness,[4] excellent combination of strength and ductility,[5–7] high hardness,[8,9] and adequate corrosion resistance.[8,9] Unlike the conventional alloys, which generally consist of one principal element, HEAs are multiple principal element system (MPES). MPESs consisting of all or some of the transition elements like Fe, Mn, Cr, Co and Ni in various combinations have been investigated extensively. This huge focus is driven by the novel mechanical properties shown by such MPESs as compared to the established engineering materials. In this A.K. CHANDAN and S. TRIPATHY are with the Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India and also with the Materials Engineering Division, CSIR National Metallurgical Laboratory, Jamshedpur, 831007, India. M. GHOSH and S.G. CHOWDHURY are with the Materials Engineering Division, CSIR National Metallurgical Laboratory. Contact e-mail: [email protected], [email protected] Manuscript submitted March 6, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
context, Gludovatz et al.[4] reported that the equiatomic CrMnFeCoNi alloy displayed extraordinary damage tolerance with tensile strengths > 1 GPa, fracture toughness > 200 MPa m1/2 at crack initiation and ~ 300 MPa m1/2 for stable crack growth at 77 K. Deformation behavior and mechanical properties of the equiatomic CrMnFeCoNi alloy are available in open domain literature.[4,7,10–13] Several compositional derivatives of the equiatomic CrMnFeCoNi alloy were also investigated and demonstrated encouraging mechanical properties.[13–22]. In this regard, the equiatomic CrCoNi alloy showed superior tensile properties and fracture toughness than the equiatomic CrMnFeCoNi alloy both at the room and cryo temperatures.[17,19,21] The finegrain equimolar FeCrCoNi alloy wires displayed tensile yield strength of ~ 1.2 GPa at 223 K.[20] Recently, Bae et al.[14] reported a non-equiatomic Fe60Co15Ni15Cr10 (at. pct) alloy which displayed an extraordinary combination of tensile properties with the ultimate tensile strength of ~ 1.5 GPa and ductility ~ 87 pct at 77 K. A relatively more cost-effective non-equiatomic alloy, Fe40Mn40Cr10Co10 (at. pct) was presented by Deng et al. which possessed the room temperature tensile properties comparable to the established twinning induced plasticity (TWIP) steels.[22] The alloy revealed nano twinning mediated deformation in comparison to the absence of twin formation in the equiatomic CrMnFeCoNi alloy at room temperature.[7] The concept behind the alloy design was to reduce the stacking fault energy (SFE)
by removing Ni along with suitable adjustment of other four elements. This alteration in the SFE might facilitated nano twi
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