The role of mechanical alloying on the phase structure and magnetic properties of Ni-doped CoFeAlMn high-entropy alloys

BİLGİN S., ÖZTÜRK B., Alpteki̇n F., Sünbül S. E., ÖZTÜRK S., İÇİN K.

Journal of Alloys and Compounds, cilt.1041, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1041
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.jallcom.2025.183597
  • Dergi Adı: Journal of Alloys and Compounds
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Public Affairs Index, Civil Engineering Abstracts
  • Anahtar Kelimeler: High entropy alloys, Magnetic properties, Mechanical alloying
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

In this study, the phase structure formed during the mechanical alloying preparation of Ni-doped Co4Fe2Nix(Al1.5Mn1.5)3 (x = 0, 0.5, and 1.0) high-entropy alloys (HEAs) prepared via the mechanical alloying method was examined to investigate the relationship between the changes in phase structure and magnetic properties through hysteresis curves and FORC analysis. As a result of the mechanical alloying process, intense agglomeration of particles was observed, and the particle size was determined to vary between 2.36 and 5.57 μm. Contrary to the theoretically calculated phase structure, it was found that not only the BCC phase but also the FCC and Laves phases were formed in the structure after mechanical alloying. Contrary to these analyses, microstructural examinations revealed that the BCC phase, which has a regular structure, transformed into the D03 phase due to the rapid solidification effect. Additionally, regions rich in Al, Mn, and Co were identified in the microstructure. Magnetic measurements resulted in saturation magnetization (Ms) values of 113.0, 111.6, and 112.7 emu/g for Ni0, Ni0.5, and Ni1.0 samples, respectively; intrinsic coercivity (Hci) values were determined as 171.3, 168.9, and 171.4 Oe. FORC analysis indicated that Ni addition narrows vertical diffusion and partially facilitates domain wall movement; however, structural irregularities in some samples contributed to increased intrinsic coercivity and the presence of non-ferromagnetic phases.