Hot deformation behavior of the high-entropy alloy CoCuFeMnNi

Abstract

Abstract

Processing map for controlling microstructure and unraveling various deformation mechanisms during hot working of CoCrFeMnNi high entropy alloy

“…Various deterministic domains and instability regimes have been systematically characterized in this study, whereas other studies limited their characterization to few domains. A safe hot working window has also been identified in the present study based on the outcome of the processing map, corroborated with in-depth microstructural analysis, in comparison to previous works [21][22][23].…”

“…powder metallurgy (P/M) superalloy Nimonic AP-1 [18], Zr-alloys [19], Titanium alloys [20], etc. Besides, few studies have recently appeared in literature illustrating the characterization of hot workability of few HEAs through the development of processing maps, such as CoCrFeMnNi HEA [21] CoCuFeNiMn HEA [22], and CoCuFeNiTi HEA [23] etc. Although, some authors [21][22][23] have reported hot workability of HEAs, none of them conducted an in-depth analysis in terms of microstructural correlation over each domain in the processing map constructed based on the DMM using a wide range of temperatures and strain rates.…”

Improvement of Corrosion and Wear Resistance of CoCrNiSi0.3 Medium-Entropy Alloy by Sputtering CrN Film

“…High entropy alloys (HEAs) consisting of multi-principal elements are changing the traditional definition of metallurgical alloys and exploring the unknown territories of alloy design [ 1 ]. Recent reports illustrate the excellent mechanical properties of HEAs in many aspects, such as the trade-off between tensile strength and ductility at cryogenic temperatures [ 2 ] and acceptable mechanical endurance in high-temperature environments [ 2 , 3 ]. Several studies attempt to elevate the mechanical performance of novel HEA systems through solid solution strengthening [ 4 , 5 ], precipitation hardening [ 6 , 7 ], and grain refinement strengthening [ 8 ].…”

Hot Deformation and Dynamic Recrystallization Behavior of CoCrNi and (CoCrNi)94Ti3Al3 Medium Entropy Alloys

“…Thus, the investigation of hot deformation behavior and dynamic recrystallization mechanism is a prerequisite for controlling the grain size and morphology [19][20][21]. The hot compression behaviors of CoCrFeMnNi HEA at various temperatures higher than 800 • C have been studied, and the constitutive equations were formulated for describing the interdependency between deformation temperature, strain rate, flow stress, and strain [22][23][24][25][26]. It was found that the microstructure evolution at the temperatures is accompanied by discontinuous dynamic recrystallization (dDRX), where the dynamic recrystallization (DRX) grains nucleated along initial grain boundaries resulting in the necklace like structures [24][25][26].…”