Accession Number : AD0802241

Title :   THE BRITTLE FRACTURE OF NON-METALS.

Descriptive Note : Final rept. 1 Jun 65-31 May 66,

Corporate Author : MARTIN MARIETTA CORP BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES

Personal Author(s) : Pugh, E. N.

Report Date : OCT 1966

Pagination or Media Count : 27

Abstract : A metallographic study has been made of the room-temperature deformation of Ge, Al2O3, and Tic, using both optical and electron microscopy. Examination of microhardness impressions provides strong evidence that dislocation motion can occur in these materials at room temperature. However, extensive studies of the fracture of Ge bend testpieces indicate that dislocations play no significant role in the fracture process and that failure is completely brittle. (Author)

Descriptors :   *BRITTLENESS), (*CERAMIC MATERIALS, FRACTURE(MECHANICS)), (*GERMANIUM, FRACTURE(MECHANICS)), (*FRACTURE(MECHANICS), CRYSTAL DEFECTS, ALUMINUM COMPOUNDS, OXIDES, TITANIUM COMPOUNDS, CARBIDES, NOTCH SENSITIVITY, SEMICONDUCTORS.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE