Ultrafine-Grained AlCoCrFeNi_2.1Eutectic High-Entropy Alloy

Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

“…To date, the reported superior mechanical properties of HEAs, have been achieved mostly with multi-phase structures, which are principally attributed to the presence of second phases and phase metastability induced strengthening [2,[4][5][6][7][8][9][10]. Comparing with multi-phase HEAs, it is more difficult to attain a good combination of strength and ductility in single-phase HEAs at room temperature, particularly for single-phase fcc HEAs [2,11].…”

Microstructure and mechanical properties variation with Ni content in Al0.8CoCr0.6Fe0.7Nix (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

“…Up to now, multiple as-cast EHEAs with different constituent phases were reported to exhibited excellent mechanical properties [16][17][18][19][20][21][22][23][24][25][26]. Among these newly reported EHEAs, the FCC-based/BCC-based structure EHEAs were found displaying a favorable processability, as well as a desirable combination of strength and plasticity after thermo-mechanical treatment, which greatly promoted the engineering applications of HEAs in industrial fields [16,17,20,[23][24][25][26]. The excellent performance of this kind of EHEAs could be ascribed to not only the fine lamellar microstructure constituting by the alternative ductile and hard phases, but also the plenty of phase interface which induced significant interface hardening effect.…”

“…Although exhibiting multifarious engineering applications, great efforts still be made on HEAs to pursue more excellent mechanical properties. The typical strengthening mechanisms such as precipitation-hardening [6][7][8], TWIP (twinning-induced plasticity) [9,10], TRIP (transformation-induced plasticity) [11,12], and dual-phase structure [13][14][15][16][17][18][19][20][21][22][23][24][25][26] was introduced in HEAs to achieve the good combination of high strength and large plasticity. Among these strengthening mechanisms, dual-phase structure was widely used and found being able to effectively achieve a balance of strength and plasticity by reasonably collocating the constituent phase.…”

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

“…The very high work hardening is attributed to the fine lamellar structure with an alternate layer of soft FCC and hard BCC phase. In a similar line, Wani et al [89,90] attempted to enhance the mechanical properties of AlCoCrFeNi 2.1 alloy with duplex structure through thermomechanical processing and demonstrated a very high ultimate tensile strength of 1.2 GPa with a total elongation of %23%. He et al [91] attempted to design eutectic HEAs based on CoCrFeNiNb x and suggested that CrFeCoNiNb 0.5 exhibits a remarkable combination of fracture strength and ductility, with compressive fracture strength and ductility of above %2.3 GPa and %40%, respectively.…”