A high entropy alloy of AlCrFeNiTiZn synthesized through mechanical alloying and sintering

• Published in: Intermetallics 2023-10, Vol.161, p.107981, Article 107981
• Main Authors: Kalantari, Helia, Khayati, Gholam Reza, Adeli, Mandana
• Format: Article
• Language: English
• Subjects: High entropy alloy; Johnson mehl avrami model; Mechanical alloying; Sintering
• ISSN: 0966-9795
• DOI: 10.1016/j.intermet.2023.107981

Through mechanical alloying, the high entropy alloy AlCrFeNiTiZn (HEA) is produced. After 120 h, the milled powder shows uniform morphology and homogeneous composition, with an average size of 190 nm. Solid solution phases with BCC (A = 2.88 ± 0.02 Å) and FCC (a = 3.57 ± 0.02 Å) crystalline structures were confirmed by XRD and TEM in prepared high entropy alloy. There is only one exothermic peak at 290 °C on DSC thermogram of the 120 h milled powder. During milling, Johnson Mehl Avrami model effectively explained the kinetics of AlCrFeNiTiZn HEA formation and characterized its type as diffusion-controlled nucleation. In a tube furnace at 800 °C, similar phases were also observed after cold pressing and sintering HEA powder. The alloy had a porosity of 14% and a density of 86%. •120 h milling of AlCrFeNiTiZn, led to formation of a dual-phase HEA (FCC + BCC).•Johnson-Mehl-Avrami model fits the formation of dual phases in AlCrFeNiTiZn.•AlCrFeNiTiZn HEA has diffusion-controlled nucleation and growth during MA.•The sintered alloy revealed the same phases with 14% porosity.