Compression properties and work-hardening behavior of the NiAl matrix composite reinforced with in situ TaC ceramic particulates. (April 2021)

• Record Type: Journal Article
• Authors: Kou, Shu-Qing; Gao, Yun-Lei; Song, Wei; Zhao, Hai-Long; Guo, Yi-Bo; Zhang, Shuang; Yang, Hong-Yu
• Is Part Of: Vacuum. Volume 186(2021)
• Publication Date: 2021-04
• Subjects: NiAl intermetallic -- Microstructure -- Deformation and fracture -- E2EM model -- Mechanical properties; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.110035
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: A comprehensive analysis of the microstructure, compression performance and work hardening capacity of an in situ ceramic-reinforced NiAl matrix composite through the integration of combustion synthesis and hot pressing was investigated. The results showed that the grain size of the composite containing 5 vol% TaC ceramic particles was refined by 64%. Meanwhile, there was a small lattice mismatch between NiAl matrix and TaC ceramic particles, which also means that the low-energy interface between the NiAl and TaC contributed to the stability of the interface combination. Furthermore, the yield strength, maximum compression stress and strength-ductility balance of the composite were increased by 31%, 26% and 15%, respectively. This paper focuses on the mechanical properties and mechanism of a NiAl matrix composite with 5 vol% in situ TaC ceramic particles at room temperature. Highlights: The microstructures of NiAl alloy are significantly refined by in-situ nano-TaC particles. The NiAl composite reinforced by nano-TaC exhibits high yield strength and work hardening capacity. The main strengthening mechanisms of the nanocomposite are grain refinement, thermal mismatch.