Effects of interstitial and substitutional alloying on dislocation structures and mechanical properties of refractory metals. Final scientific report
Technical Report
·
OSTI ID:7355406
Mechanical testing in tension and compression has been done on single crystals of tantalum and tantalum-base interstitial and substitutional solid solutions involving a wide range of crystallographic orientations. These experiments were complemented by analyses of slip lines and dislocation structures by optical and high voltage electron microscopy, respectively. The research has established many aspects of the relative roles of the Peierls stress of extended screw dislocations and solution hardening in determining the low temperature strength of body-centered cubic materials. The major findings include (a) establishing the importance of the normal stress on low temperature strength of bcc materials; (b) determination of the large effects of solutes on the orientation dependence of yielding, the stress differential in tension and compression, slip and twin systems, and primary screw dislocation structure, distribution, density, and cross glide; and (c) determination that the widths of extended screw dislocations in bcc materials are very small.
- Research Organization:
- Cambridge Univ. (UK). Dept. of Metallurgy and Materials Science
- OSTI ID:
- 7355406
- Report Number(s):
- AD-A-008872
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
BCC LATTICES
CRYOGENIC FLUIDS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DEFORMATION
DISLOCATIONS
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
FLUIDS
IMPURITIES
INTERSTITIALS
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
MIXTURES
MONOCRYSTALS
NITROGEN
NONMETALS
ORIENTATION
POINT DEFECTS
REFRACTORY METALS
RHENIUM ALLOYS
SCREW DISLOCATIONS
SOLID SOLUTIONS
SOLUTIONS
STRESSES
TANTALUM
TANTALUM ALLOYS
TANTALUM BASE ALLOYS
TENSILE PROPERTIES
TRANSITION ELEMENTS
YIELD STRENGTH
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
BCC LATTICES
CRYOGENIC FLUIDS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DEFORMATION
DISLOCATIONS
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
FLUIDS
IMPURITIES
INTERSTITIALS
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
MIXTURES
MONOCRYSTALS
NITROGEN
NONMETALS
ORIENTATION
POINT DEFECTS
REFRACTORY METALS
RHENIUM ALLOYS
SCREW DISLOCATIONS
SOLID SOLUTIONS
SOLUTIONS
STRESSES
TANTALUM
TANTALUM ALLOYS
TANTALUM BASE ALLOYS
TENSILE PROPERTIES
TRANSITION ELEMENTS
YIELD STRENGTH