Preparation and mechanical properties of (MoCrVMn)2FeB2 based high-entropy cermets

• Published in: Ceramics international Vol. 50; no. 18; pp. 34049 - 34059
• Main Authors: Wang, Tianyu, Ma, Shiqing, Yang, Luhao, Li, Shangxin, Liu, Yang, Li, Bochao, Hu, Lianhai
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15-09-2024
• Subjects: (MoCrVMn)2FeB2; High-entropy materials; Mechanical properties; Microstructure; Phase evolution; Mechanical properties; Phase evolution; (MoCrVMn)2FeB2; Microstructure; High-entropy materials
• ISSN: 0272-8842
• DOI: 10.1016/j.ceramint.2024.06.224

A novel (MoCrVMn)2FeB2 based high-entropy cermets were prepared by two-steps method and the microstructure and mechanical properties were investigated. The single-phase (MoCrVMn)2FeB2 powders were synthesized at 1400 °C for 2 h, and subsequently the (MoCrVMn)2FeB2 based high-entropy cermets were prepared via pressureless sintering technique. The results revealed that the phase evolution was as follows: (Mo, Cr, V, Mn, Fe, B) → (Fe2B, V2B3, MoB) → ((FeVMn)2B, (FeVMnCr)2B, Mo2FeB2) → (MoCrVMn)2FeB2. The (MoCrVMn)2FeB2 based high-entropy cermets sintered at 1250 °C showed good denseness and the ceramic phases were uniformly distributed in the metal bond, with the optimal mechanical properties of hardness 1355 HV30 and fracture toughness 19.09 MPa m1/2. With the increase of temperature, the hardness increased first and then decreased, and the fracture toughness was basically unchanged first and then increased, and then decreased. This study provides a new route to further optimize the performance of Mo2FeB2 based cermets.