The mechanical properties of nanoceramic CeO 2 under high pressure

Investigating the mechanical properties of nanoceramic has been an important topic in fundamental science and industrial application. In this study, pressure gradient approach method is introduced. The yield strength of nano-CeO 2 increases with decreasing grain sizes and increasing pressure, consistent with the Hall-Patch effect. Three cycle experiments show that the decrease in yield stress after cycling is correlated with the decrease in sample thickness. For comparison, the yield strength of 10 nm nickel was also measured. Transmission electron microscope measurement revealed the quenched the deformation of coarse-grained CeO 2 is dominated by cracks, while small amount of dislocations exist in CeO 2 . Graphical Abstract