Microstructure and tribological properties of Cr3C2/Ni3Al composite materials prepared by hot isostatic pressing (HIP). (5th February 2017)

• Record Type: Journal Article
• Authors: Fu, Lihua; Han, Wei; Gong, Karin; Bengtsson, Sven; Dong, Chaofang; Zhao, Lin; Tian, Zhiling
• Is Part Of: Materials & design. Volume 115(2017)
• Page Start: 203
• Page End: 212
• Publication Date: 2017-02-05
• Subjects: Cr3C2/Ni3Al composites -- Hot isostatic pressing -- Microstructure -- Tribological properties; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.11.060
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Ni3 Al-based composites with different Cr3 C2 contents were fabricated by the hot isostatic pressing (HIP) technique. The microstructure, phase constitution, and tribological properties of the composites were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and pin-on-disk wear tests. The results revealed that the strengthening phase is distributed homogeneously in the Ni3 Al matrix. During the HIP process, M7 C3 (M = Cr, Fe) is formed by diffusion of Fe, C, and Cr to the interface between the Cr3 C2 particles and Ni3 Al matrix. The diffusion process binds the phases and is important for improving the wear resistance of Cr3 C2 /Ni3 Al composites. The wear measurements demonstrated that micro-cutting and fatigue wear are the dominant mechanisms for this tribological pair. The wear resistance of Cr3 C2 /Ni3 Al composites is significantly improved by the addition of Cr3 C2 particles. When the content of Cr3 C2 is within a certain range, the wear resistance of Cr3 C2 /Ni3 Al composites increases as the Cr3 C2 content increases. However, the addition of excess Cr3 C2 (for example, 24 vol% in this work) could lead to a decrease in the wear resistance of the composites. In addition, the average friction coefficients and wear of the counterpart decrease with increasing Cr3 C2 addition. Graphical abstract: Highlights: A M7 C3 (M = Cr, Fe) phase is formed in Cr3 C2 /Ni3 Al composites prepared by hot isostatic pressing. The hardness of the Cr3 C2 /Ni3 Al composites increases with increasing addition of Cr3 C2 . The wear resistance of Cr3 C2 /Ni3 Al composites is improved due to the Cr3 C2 asperities keep the sliding surfaces apart. Excess addition of Cr3 C2 (such as 24 vol%) can decrease the wear resistance of Cr3 C2 /Ni3 Al composites.