Plastic deformation of a magnesium oxide 001-plane surface produced by cavitationAn investigation was conducted to examine plastic deformation of a cleaved single-crystal magnesium oxide 001-plane surface exposed to cavitation. Cavitation damage experiments were carried out in distilled water at 25 C by using a magnetostrictive oscillator in close proximity (2 mm) to the surface of the cleaved specimen. The dislocation-etch-pit patterns induced by cavitation were examined and compared with that of microhardness indentations. The results revealed that dislocation-etch-pit patterns around hardness indentations contain both screw and edge dislocations, while the etch-pit patterns on the surface exposed to cavitation contain only screw dislocations. During cavitation, deformation occurred in a thin surface layer, accompanied by work-hardening of the ceramic. The row of screw dislocations underwent a stable growth, which was analyzed crystallographically.
Document ID
19870032230
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hattori, S. (NASA Lewis Research Center Cleveland, OH, United States)
Miyoshi, K. (NASA Lewis Research Center Cleveland, OH, United States)
Buckley, D. H. (NASA Lewis Research Center Cleveland, OH, United States)