BASIC MECHANISMS OF STRAIN HARDENING IN CERAMICS.
Abstract
The paper deals with fundamental studies of strain hardening in rock salt structure ceramics. Strain hardening at low temperatures is primarily associated with dislocation interactions within single slip bands. As the slip band structure varies so the mechanism controlling strain hardening changes. It may involve dislocation dislocation interaction (Taylor hardening), dislocation dipole interaction, or dislocation - prismatic loop interaction depending on the particular material and test temperature. Strain hardening at intermediate temperatures is associated with multiple slip. Conjugate slip is much less effective in hardening a crystal than oblique slip, principally because dislocations with oblique Burgers vectors react to form sessile dislocations. Strain hardening due to conjugate slip completely disappears at high temperatures and crystals deforming by this mode become plastically unstable. Strain hardening due to oblique slip never disappears. At high temperatures, the dislocation reaction generates stable dislocation networks which constitute the major barrier to dislocation movement. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0623887
Entities
People
- R. J. Stokes
Organizations
- Honeywell International, Inc.