741042.fig.004a
(a)
741042.fig.004b
(b)
Figure 4: FE-SEM photomicrographs of shear-induced deformation band formation and microcracking (marked by hollow white arrows) at the indentation cavities of alumina at typical illustrative lower loading rates of (a) 2 × 10−3 and (b) 100 N·s−1.