Deformation and failure of alumina under high strain rate compressive loading

Single crystal growth of CoTi2O5 by solid state reaction synthesis

“…Firstly, in a process similar to recovery or creep, subgrains may form through the coalescence of dislocations resulting from relaxation of transformation stresses . Subgrains have also been observed to form in alumina subjected to high strain rate deformation . Although this mechanism cannot be ruled out, it is believed to be unlikely because dislocations were invariably observed in the form of sub‐boundaries, and there was no evidence of dislocation structures consistent with slip.…”

Dynamic failure and fracture mechanism in alumina ceramics: Experimental observations and finite element modelling

“…A portion of research has been conducted to study the failure mechanism of ceramics in the two length scales: (1) the nucleation, growth and interaction of micro-cracks, and (2) the macroscopic failure behaviour including macro-cracking and fragmentation [10][11][12][13][14][15]. Micro-cracks nucleate at heterogeneities in ceramics such as grain boundaries and inclusions [13].…”

“…Micro-cracks nucleate at heterogeneities in ceramics such as grain boundaries and inclusions [13]. Microstructural features have a significant effect on the microcrack propagation path; and micro-cracking plays a crucial role in determining the overall failure behaviour in ceramics [14][15][16][17][18]. The fracture of grains (i.e., transgranular fracture) and the failure of grain boundaries (i.e., intergranular fracture) can be the possible fracture modes in ceramics dependent on the chemical compositions, microstructure and the external loading rates.…”

Impact Energy Absorption Analysis of Spark Plasma Sintered Al2O3 Reinforced Bulk Multiwalled Carbon Nanotube Compacts Using Nanoindentation

“…What was even more interesting to note that for both pure MWCNT and 15 wt% Al 2 O 3 /MWCNT samples, RSB increased with applied nanoindentation load while an opposite trend was seen in pure Al 2 O 3 . This was due to the fact that for pure Al 2 O 3 , extent of permanent deformation (i.e., h f ) increased significantly with load and hence that consistently decreased the numerator factor of RSB calculation . This process finally resulted in observed gradual decrease in RSB with load in Batch‐ A1 (Table ).…”