Accession Number : AD0463115

Title :   RESEARCH TO DETERMINE THE MECHANISMS CONTROLLING THE BRITTLE-DUCTILE BEHAVIOR OF REFRACTORY CUBIC CARBIDES.

Descriptive Note : Rept. for 1 Jan-31 Dec 64,

Corporate Author : UNION CARBIDE CORP PARMA OH

Personal Author(s) : Williams, Wendell S. ; Lye, Robert G.

Report Date : APR 1965

Pagination or Media Count : 143

Abstract : The high-temperature compressive yield stress and room temperature flexural strength of polycrystalline TiC have been studied. Grain boundaries are not impenetrable barriers to slip propagation at high temperatures. Creep of single crystals at high temperatures was measured; creep appears to be controlled by intrinsic lattice resistance to dislocation motion. Electron microscopy studies of localized plastic flow produced by diamond indenters at room temperature revealed slip lines. A theoretical discussion has been made of the apparently anomalous thermal conductivity of the carbides. Motion of carbon in TiC under the influence of a thermal gradient and an electric current was observed. To study the type of bonding in TiC, the Seebeck coefficient, optical reflectivity, and photoemission have been measured. (Author)

Descriptors :   (*CARBIDES, MECHANICAL PROPERTIES), (*TITANIUM COMPOUNDS, CARBIDES), COMPRESSIVE PROPERTIES, CREEP, HIGH TEMPERATURE, ELECTRON MICROSCOPY, ELECTRICAL PROPERTIES, OPTICAL PROPERTIES, CHEMICAL BONDS, REFRACTORY MATERIALS, SINGLE CRYSTALS, CRYSTALS, ETCHED CRYSTALS, HEAT OF ACTIVATION, BRILLOUIN ZONES, TRANSITION METALS, BIBLIOGRAPHIES, STRESSES, THERMAL CONDUCTIVITY, DEFORMATION, PLASTIC PROPERTIES, ELASTIC PROPERTIES, HARDNESS, TRANSPORT PROPERTIES, DUCTILITY, BRITTLENESS, PHONONS, ATOMIC ENERGY LEVELS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE