Controlled Valence Electron Concentration Approach to Tailor the Microstructure and Phase Stability of an Entropy-Enhanced AlCoCrFeNi Alloy

Correlation between the nanomechanical characteristic and the phase transformation of BCC-based high entropy alloys produced via powder metallurgy

“…This is consistent with the previous reports of Dong et al, who postulated that topologically complex precipitates in HEAs become highly stable at 0.110 < Δχ < 0.133 [43]. The decrease in the B2 phase in this study was attributed to the relatively high VEC for HEAs with high Cu fractions in this study, which is consistent with Guo's criterion [9,18,35]. In addition, existence of multiphase transformation dispersed within the BCC matrix improved the mechanical performance of AlFeMnTiSi 0.75 Cu x HEAs.…”

“…In addition, as the Cu fraction increased in the AlFeMn-TiSiCu alloy system, the HEAs hardening was accelerated owing to the dispersion of the hard B2 phases and the increase in the BCC phase fraction. Similar observations were reported in a previous study [9,18]. The change in the hardness with a change in the density of the alloy investigated in this study was compared to those of previously reported HEAs (Figure 6 (c)).…”

“…Similarly, the brittle nature of BCC HEAs hinders their application in load-bearing safety structures. To overcome these drawbacks, versatile combinations of HEAs have been proposed in the existing literature [6][7][8][9]. Nevertheless, owing to their exceptional mechanical performance and thermomechanical stability, HEAs are employed in various applications, including in nuclear reactors, spacecraft components and additive manufacturing, and have attracted significant research [10][11][12][13].…”

Complementary Functions of Vanadium in Boosting Electrocatalytic Activity of CuCoNiFeMn High‐Entropy Alloy for Water Splitting

“…As shown in Table S1 (Supporting Information), the lattice constant of V 1.0 ‐HEA decreased based on the following: i) the atomic size difference increased to 2.55% by incorporating V, inducing severe lattice distortion by reducing the average linear distance between atoms, ii) the φ value increased to 25.51 mol·K kJ −1 as the bonding energy between atoms increased, and iii) the atomic size mismatching increased while optimizing the severe lattice with a reduced interatomic distance. [ 26–28 ] Consequently, the XRD analysis demonstrated that V was successfully incorporated in the HEA with noticeable lattice constant reduction and no secondary phase formation. However, V 1.5 ‐HEA showed the VEC mix and ∆ χ values of 7.94 and 0.144, respectively (Table S2, Supporting Information), further confirming the phase separation.…”

Oxidative and abrasive wear of multiphase AlSi0.75TiMnFeCux (X = 0, 0.25, 0.5) high entropy alloy under non-lubricating reciprocating motion

“…Recent researchers have actively shown the effect of various elemental additives in HEAs to enhance their mechanical properties by mixed valence electron concentration (VEC) approach [16] and use of metallic additive [11,[16][17][18][19]. Many research efforts have been devoted to the microstructure and mechanical performance of AlCoCrFeNi HEAs [17][18][19].…”