Brittle to ductile transition to cleavage fracture: Progress report, April 1-November 30, 1987
The brittle-to-ductile transition in cleavage fracture in single crystals is being studied both experimentally and theoretically as the key problem in such fracture transitions exhibited by intrinsically brittle (cleavable) polycrystalline solids. The intrinsic process that governs the transition is thermally assisted dislocation emission from the tips of atomically sharp cleavage cracks at the verge of propagation, which then provide effective crack tip shielding and blunting. All other phenomena known to influence the transition in fracture, such as shielding provided through the polarization of free dislocations in the distant field, micro-crack initiation, etc., are identified as extrinsic processes that merely shift the basic transition to lower temperatures or higher crack velocities, or consider formation of cracks with the required velocity for cleavage propagation.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Mechanical Engineering
- DOE Contract Number:
- FG02-87ER45294
- OSTI ID:
- 5532281
- Report Number(s):
- DOE/ER/45294-T1; ON: DE88004074
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BRITTLE-DUCTILE TRANSITIONS
CARBON ADDITIONS
CHALCOGENIDES
CRACK PROPAGATION
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DISLOCATIONS
DOCUMENT TYPES
ELEMENTS
FAILURES
FRACTURES
IRON ADDITIONS
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PROGRESS REPORT
RESEARCH PROGRAMS
SEMIMETALS
SILICON
SILICON ALLOYS