Failure mechanism of nano-structural interfacial layer in Mg matrix composites reinforced with Cf. (March 2022)

• Record Type: Journal Article
• Authors: Wang, W.G.; Zhang, J.F.; Zan, Y.N.; Liu, Z.Y.; Wang, D.; Xiao, B.L.; Ni, D.R.; Ma, Z.Y.
• Is Part Of: Composites. Volume 154(2022)
• Publication Date: 2022-03
• Subjects: Carbon fibres -- Metal-matrix composites (MMCs) -- Interface -- Microstructural analysis; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2021.106780
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: The surface of continuous carbon fibers (Cf ) was modified with γ-Al2 O3, anatase-TiO2 and yttria stabilized zirconia (YSZ) coatings in sol-gel route, and denoted by Al2 O3 @Cf, TiO2 @Cf and YSZ@Cf, respectively. Following, Cf /Mg composites were prepared using vacuum pressureless infiltration processing. Except for coatings, the others preparation process parameters were same. Independent of the volume fraction of Cf, the strengthening ratio (the ratio of measured tensile strength to theoretically predicted value) of Al2 O3 @Cf /Mg, TiO2 @Cf /Mg and YSZ@Cf /Mg is about 45%, 80% and 90%, respectively. In view of high resolution transmission electron microscope observation, the evolutions of interfacial micro-cracks and interfacial failure mechanisms were analyzed. In YSZ@Cf /Mg, the interfacial micro-crack was more likely to initiate at the soft grain boundaries (GBs) of interfacial layer (IL), and then propagate along GBs within IL, showing jagged-like morphology. The jagged-like micro-cracks would consume more destructive energy, resulting into the excellent performance of YSZ@Cf /Mg.