Microstructural, electromagnetic shielding, and electrical properties of CNT-reinforced multifunctional FeCoCrAl high-entropy alloys
Journal of Materials Science: Materials in Electronics, cilt.37, sa.28, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 37 Sayı: 28
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s10854-026-18554-5
- Dergi Adı: Journal of Materials Science: Materials in Electronics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Compendex, INSPEC, MEDLINE, Engineering Source (EBSCO), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Gazi Üniversitesi Adresli: Evet
Özet
Nano-sized (FeCoCr)94Al6 high-entropy alloy (HEA) composites reinforced with 5 wt % multi-walled carbon nanotubes (MW-CNTs) were successfully synthesized via a two-stage mechanical alloying process, with primary milling durations optimized at 7 h, 60 h, and 100 h. The study investigates the synergy between the evolving microstructure, magnetic properties, electrical conductivity, and electromagnetic interference (EMI) shielding performance up to 26 GHz microwave range. All samples exhibited soft magnetic behavior, confirmed by low coercivity (Hc < 150 Oe), which is critical for minimizing core losses at high frequencies. The most significant finding relates to the electrical and EMI response; the addition of CNTs substantially increased electrical conductivity up to a 43.8% increase for the 100 h sample and drastically improved impedance matching, evidenced by reflection loss minima approaching − 35 dB. Consequently, the primary shielding mechanism shifted from reflection to absorption. This mechanism change stabilized the total EMI shielding effectiveness, providing a consistent performance across the mid-frequency band (5–15 GHz). The resulting FeCoCrAl + 5%CNT composites demonstrate robust and stable shielding performance with Shielding Effectiveness > 40 dB across the entire 0–26 GHz spectrum, positioning them as highly promising multifunctional materials for broadband EMI mitigation.