Investigation of the interfacial bonding properties of NiAl-based composites

• Published in: Journal of physics. Conference series Vol. 2808; no. 1; pp. 12001 - 12005
• Main Authors: Sun, Biao, Cao, Tong, Qiu, Bo, Zhang, Geng, Ding, Feng
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.07.2024
• Subjects: Binding energy; Chemical bonds; Composite materials; Deformation mechanisms; Deformation wear; Fatigue wear; Intermetallic compounds; Microcracks; Molecular dynamics; Nickel aluminides; Nickel base alloys; Nickel compounds; Plastic deformation; Room temperature; Spalling; Spark plasma sintering; Wear mechanisms
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2808/1/012001

Abstract NiAl-based composites with Ag 2 Mo 2 O 7 addition were prepared by spark plasma sintering technology. The microstructure and interfacial bonding characteristics of NiAl-based composites were explored, and the wear mechanism was revealed at room temperature. The interfacial bonding properties were analyzed at the molecular level based on molecular dynamics. The results suggest that after sintering, Ag 2 Mo 2 O 7 transforms into Ag and MoO 3 phases, forming NiAl/Ag and NiAl/MoO 3 interfaces. Plastic deformation and fatigue wear account for the majority of the wear mechanism in NiAl-based composites at room temperature. The binding energy of the NiAl/Ag interface is about 16% higher than that of the NiAl/MoO 3 interface. Among them, the binding energy of the NiAl/Ag interface is 1.759 kcal/mol·Å 2 , and the binding energy of the NiAl/MoO 3 interface is 1.475 kcal/mol·Å 2 . The fatigue spalling and microcrack of NiAl matrix composites at room temperature are attributed to the poor interfacial bonding properties between NiAl and MoO 3 .