Determination of Hardness and Fracture Toughness of Y-TZP Manufactured by Digital Light Processing through the Indentation Technique

Figure 7

Optical micrographs of Vickers indentations with cracks emanating from the indentation corner under loads of 49.03 N (a), 98.07 N (b), and 196.1 N (c).

(a) Indentations under the load of 49.03 N. The cracks were of Palmqvist type; some of which could not be observed clearly

(b) Indentations under the load of 98.07 N. The cracks were of Palmqvist type or radial-median type

(c) Indentations under the load of 196.1 N. The cracks were of radial-median type, which were clearly visible