On the Path to Optimizing the Al-Co-Cr-Cu-Fe-Ni-Ti High Entropy Alloy Family for High Temperature Applications

Abstract

Abstract:The most commonly investigated high entropy alloy, AlCoCrCuFeNi, has been chosen for optimization of its microstructural and mechanical properties by means of compositional changes and heat treatments. Among the different available optimization paths, the decrease of segregating element Cu, the increase of oxidation protective elements Al and Cr and the approach towards a γ-γ 1 microstructure like in Ni-based superalloys have been probed and compared.

Precipitation and Hardness of Carbonitrides in a CrMnFeCoNi High Entropy Alloy

“…Consequently, intermetallic precipitation hardening in HEAs is explored. Avoiding the formation of brittle phases while tuning the characteristic of the precipitates distribution to optimize the compromise between strength and ductility, remains challenging in HEAs . For example, adding V to the CrMnFeCoNi HEA results in the formation of the σ phase and second‐phase fcc particles .…”

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

“…Recently, high-entropy alloys (HEAs) have attracted considerable attention because of their extraordinary properties [1][2][3][4][5][6][7][8][9][10], and numerous HEAs have been reported with various compositions [1][2][3][4][5][6][7][8][9][10]. Three major HEAs are CoCrFeMnNi alloy which has potential applications in cryogenic environments [5,6], refractory VNbMoTaW alloy for high-temperature structural applications [7,8], and AlCoCrFeNi alloy which maintains high strength up to intermediate temperatures [9,10].…”

Evaluation of microstructural and corrosion resistance of as-cast Cu45Mn25Al15Fe5Cr5Ni5 high entropy alloy

“…Cu containing high entropy alloys attracted attention due to its unique solidification path in terms of presence of liquid phase separation phenomenon [10][11][12]. The addition of Cu to FeMnCrNiCo alloy shows the formation of two fcc phases fcc1/fcc2 dual structure [10][11][12][13][14][15][16][17]. In addition, Tong et al [18], investigated the effect of Al on the mechanical properties of CoCrCuFeNi system.…”