Grain size and grain boundary effects on the mechanical behavior of fully stabilized zirconia investigated by nanoindentation

Characterization of oxide layers grown on D9 austenitic stainless steel in lead bismuth eutectic

“…In contrast to the measurements in F-YSZ on large grains [7] no pop in (a sudden displacement change by unchanged load) phenomenon was found here. It was also found [7] that small grain structured materials do not show pop in. Since the AFM measurements performed here revealed a large number of pores (within the grain and on grain boundaries) and a small substructure within the large grains it appears that these features lead to material behavior as seen for a fine grained material [7].…”

“…Similar phenomena were observed [7] on fully yttria stabilized zirconia (F-YSZ). In contrast to the measurements in F-YSZ on large grains [7] no pop in (a sudden displacement change by unchanged load) phenomenon was found here. It was also found [7] that small grain structured materials do not show pop in.…”

Characterization of pop-in phenomena and indentation modulus in a polycrystalline ZrB2 ceramic

“…The same was observed in a ZrO 2 ceramic material. 32 However, when an indent was placed very close to a grain boundary, both pop-in load and pop-in extent decreased, Fig. 9b, as it was reported for a gold film.…”

“…31 However, the appearance of pop-in was previously observed also in other ceramics whose surface was prepared by mechanical polishing. 14,32 The rationale of the detected pop-in excursions will be in the following presented at the light of dislocation activity. The occurrence of pop-in due to an eventual phase transformation cannot be of course excluded but at the moment it is out of our investigation capabilities.…”

Electrical and mechanical properties of 25 wt% tetragonal/cubic zirconia based composite thin films prepared by combination of aqueous tape casting and net shape methods

“…It has been reported that the Young modulus and nanohardness of YSZ ceramics are not dependent on yttria content but can be affected by the microstructural features of ceramics like porosity [26,27]. This is consistent with the fact that both 3YSZ and 3YSZ-I3 samples have the comparable density and so have relatively comparable hardness and Young's modulus.…”