Accession Number : ADA184686

Title :   Indentation Damage in Ceramics.

Descriptive Note : Final rept. Mar 85-Mar 87,

Corporate Author : NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD CERAMICS DIV

Personal Author(s) : Lawn,Brian R ; Hockey,B J

PDF Url : ADA184686

Report Date : 30 May 1987

Pagination or Media Count : 52

Abstract : The basic processes of indentation damage in brittle ceramics have been studied. Attention has focused on the roles of material crystallography and microstructure in determining the nature of the damage pattern. Microscopy techniques, particularly transmission electron microscopy, have been used to characterize the attendant deformation and fracture of Vickers indentation sites. Strength, toughness, and wear measurements have been carried out on polycrystalline materials to ascertain how the damage characteristics influence the ensuing mechanical properties. It is concluded that material microstructure can be a crucial factor in structural design with ceramics.

Descriptors :   *CERAMIC MATERIALS, *PENETRATION, DAMAGE, GRAIN BOUNDARIES, SILICON, MODELS, SAPPHIRE, ALUMINUM OXIDES, WEAR RESISTANCE, DEFORMATION, CRACK PROPAGATION, AMORPHOUS MATERIALS, MACHINING, STRENGTH(MECHANICS), MICROSTRUCTURE, TOUGHNESS, CRYSTALLOGRAPHY, NOTCH SENSITIVITY, POLYCRYSTALLINE, CRYSTAL STRUCTURE

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE