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

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)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1965
Accession Number
AD0463115

Entities

People

  • Robert G. Lye
  • Wendell S. Williams

Tags

DTIC Thesaurus Topics

  • Conductivity
  • Creep
  • Crystals
  • Electric Current
  • Electron Microscopy
  • Electrons
  • Flexural Strength
  • Grain Boundaries
  • High Temperature
  • Microscopy
  • Plastic Flow
  • Single Crystals
  • Temperature Gradients
  • Thermal Conductivity

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene