Role of Al/Si ratio on phase evolution, magnetic properties, and hardness of Fe-Co-Ni-Al-Si non-equiatomic high-entropy Alloys
Solid State Sciences, cilt.181, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 181
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.solidstatesciences.2026.108465
- Dergi Adı: Solid State Sciences
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Arc melting, High entropy alloys, Magnetic properties, Mechanical alloying, Microstructure
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
This study examined the effects of Al/Si ratio and processing route on the phase formation, microstructure, mechanical properties, and magnetic behavior of Fe2Co4NiAlxSiy (x + y = 3) non-equiatomic high-entropy alloys produced by mechanical alloying and vacuum arc melting. Mechanically alloyed powders were predominantly BCC, whereas Fe2Co4NiSi3 may also additionally contain FCC and L12 phases; all arc-melted alloys remain BCC-dominant. Increasing Si refined the powder morphology, promoted Si-rich local segregation, and increased hardness, with HIT rising from 7.368 to 11.26 GPa. Saturation magnetization and coercivity were 79–103 emu/g and 57–64 Oe in mechanically alloyed powders, compared with 91–127 emu/g and 3–39 Oe in arc-melted alloys. Fe2Co4Ni1AlSi2 showed the best overall performance, with 213.69 GPa modulus, 9.659 GPa HIT, 127 emu/g Ms, 10 Oe Hc, and 18 Oe Hci.