Effect of Boriding Process Temperature on Microstructure, Mechanical properties, and Wear Behavior of Al0.25CoCr1.5FeMo0.5Ni HEA
Metals and Materials International, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s12540-026-02227-3
- Dergi Adı: Metals and Materials International
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: Al0.25CoCr1.5FeMo0.5Ni, Nanoindentation, Powder pack boriding, Tribological behavior
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
This study comprehensively investigates the effects of package boriding temperature on the microstructure, mechanical, and tribological properties of a high-entropy Al0.25CoCr1.5FeMo0.5Ni alloy. The treatments were conducted at 875 °C, 950 °C, and 1025 °C for five hours in a powder environment commonly used in industrial surface modifications. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) were used for microstructural characterization. Cross-sectional analyses revealed the thickness and morphology of the boride layers. While the alloy initially consisted of FCC + σ phases, the boriding process promoted the formation of complex boride layers on the surface. The layer thickness increased with temperature, reaching approximately 14 μm at 875 °C, 19 μm at 950 °C, and 70 μm at 1025 °C. Mechanical behavior was evaluated using microhardness and nanoindentation tests. Surface hardness increased from 10.8 GPa to 25.1 GPa with increasing temperature, and significant increases were observed in the elastic modulus, H/E, and H3/E2 ratios. These results indicate that the boronized surface is more resistant to plastic deformation and responds more elastically under load. Wear tests conducted under dry sliding conditions confirmed that boronizing reduces material loss by over 90%. The highest wear resistance was achieved in samples boronized at 1025 °C. Overall, the boride layer formed a strong barrier on the surface, effectively suppressing wear and surface damage. As a result, the package boronizing process significantly increased the surface strength of the alloy and demonstrated its potential for use in components operating at high temperatures.