Figure 4
From: Super-strong materials for temperatures exceeding 2000 °C
Fractographic analysis after bending tests in argon at 1500–2100 °C showing (a) the typical outermost oxidized scale upon tests at 1500 and 1800 °C, (b) WO3 whiskers surrounding ZrO2 and SiC grains, (c) extended cracking in the oxidized scale after testing at 2100 °C, (d) elongation and deformation of boride grains in the matrix after testing at 2100 °C indicated by the arrow, (e) WB pullout from the bulk and (f) SiC particle surfaces after crack propagation perpendicular and parallel to the stacking faults, left and right respectively.
