Effect of Ti and Mo content changes on microstructure and properties of laser cladding FeCoCrNiMn high entropy alloy coatings

• Published in: Intermetallics 2024-12, Vol.175, p.108509, Article 108509
• Main Authors: Kong, Lingchen, Shi, Chuanwei, Hao, Xuan, Wang, Shenhao, Huo, Yushuang, Zhu, Zhiheng, Sun, Junhua
• Format: Article
• Language: English
• Subjects: Electrochemical corrosion; High-entropy alloy; Laser cladding; Microstructure; Wear
• ISSN: 0966-9795
• DOI: 10.1016/j.intermet.2024.108509

The HEA coatings of FeCoCrNiMnTixMo1.5-x(x = 0.25, 0.5, 0.75, 1 and 1.25) were prepared by laser cladding. X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and scanning electron microscopy (SEM) were used to characterize the phase and crystal structure. The mechanical properties were tested. The results show that Ti is solidly dissolved in the FCC phase for solid solution strengthening. Mo is precipitated as the second phase σ phase for second phase dispersion strengthening. As x increases, the coating becomes the FCC+σ phase, and the σ phase disappears at x = 1.25. The microhardness and wear resistance of the coating are greatly improved by solution strengthening and second phase precipitation strengthening. The microhardness is up to 3.18 times of the substrate, and the wear resistance is up to 10.9 times of the substrate. Corrosion resistance of all coatings is better than that of 45# steel. With the increase of x, the corrosion resistance of the coating increases first and then decreases. When x = 1, the corrosion resistance of the coating is the best. •Strengthening FeCoCrNiMn High-Entropy Alloys through the Synergistic Effects of Ti and Mo Elements.•The strengthening mechanisms of Ti and Mo elements were quantitatively analyzed.•Understanding the contribution of Ti and Mo elements to the properties of high-entropy alloys.