Dislocation substructure in Ta--Re--N alloys deformed at 77 K

Journal Article · Sun Aug 01 04:00:00 EDT 1976 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02656593· OSTI ID:7321952

Shields, J A ^[1]; Gibala, R; Mitchell, T E

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1. Argonne National Lab., Idaho Falls, ID

High purity Ta, Ta-Re, and Ta-Re-N alloy single crystals were deformed in tension at 77/sup 0/K, and the resulting dislocation arrangements were studied by transmission electron microscopy. Re and N have similar effects on the dislocation substructure. Alloying increases the fraction of primary screw dislocations at the expense of debris, tangling, and secondary dislocations. For a given increment in yield stress, Re causes much larger changes in the substructure than N. The substructures observed in Ta-Re-N alloys are similar to those in Ta-Re alloys, even though ternary alloys exhibit alloy softening and binary alloys exhibit alloy hardening. These observations can be explained in terms of the different intrinsic mobilities of edge and screw dislocations, the different interactions which substitutionals and interstitials have with edge and screw dislocations, and the large differences in concentration of substitutional and interstitial solutes.

• OSTI ID: 7321952
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 7:8; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
DISLOCATIONS
EDGE DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
INTERSTITIALS
LINE DEFECTS
LOW TEMPERATURE
METALS
MICROSCOPY
MOBILITY
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
POINT DEFECTS
REFRACTORY METALS
RHENIUM ALLOYS
RHENIUM COMPOUNDS
RHENIUM NITRIDES
SCREW DISLOCATIONS
STRAINS
STRESSES
TANTALUM
TANTALUM ALLOYS
TANTALUM COMPOUNDS
TANTALUM NITRIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS