TEM studies of crack tip deformation in bcc metals at low temperatures
Conference
·
· TMS (The Metallurgical Society) Paper Selection; (USA)
OSTI ID:5442484
- Oak Ridge National Laboratory, TN (USA)
Electron microscope studies have been made of the nucleation and propagation of cracks in bcc metals during in situ tensile deformation at low temperatures. A low temperature tensile specimen stage capable of operating down to liquid nitrogen temperature has been built for this experiment. The temperature dependence of crack tip deformation and its relationship to the ductile-brittle transition have been studied by determining the distribution of dislocations ahead of propagating cracks. The observed slip systems have been analyzed in terms of the resolved shear stress modified by the presence of the crack. The results are compared with the data obtained from tensile tests performed on bulk specimens at low temperatures.
- OSTI ID:
- 5442484
- Report Number(s):
- CONF-840909--
- Conference Information:
- Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
BCC LATTICES
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKS
CRYOGENICS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DEFORMATION
DISLOCATIONS
DISTRIBUTION
DUCTILE-BRITTLE TRANSITIONS
ELECTRON MICROSCOPY
ELEMENTS
LINE DEFECTS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALS
MICROSCOPY
NITROGEN
NONMETALS
NUCLEATION
SHEAR PROPERTIES
SLIP
STRESSES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TESTING
TRANSMISSION ELECTRON MICROSCOPY
360103* -- Metals & Alloys-- Mechanical Properties
BCC LATTICES
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKS
CRYOGENICS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DEFORMATION
DISLOCATIONS
DISTRIBUTION
DUCTILE-BRITTLE TRANSITIONS
ELECTRON MICROSCOPY
ELEMENTS
LINE DEFECTS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALS
MICROSCOPY
NITROGEN
NONMETALS
NUCLEATION
SHEAR PROPERTIES
SLIP
STRESSES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TESTING
TRANSMISSION ELECTRON MICROSCOPY