Dislocation internal friction in high-purity and nitrogen-doped tantalum crystals

Journal Article · Tue Jun 01 04:00:00 EDT 1976 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(76)90092-4· OSTI ID:7251879

Knoblauch, G

The dislocation internal-friction peaks between 10 and 360/sup 0/K have been investigated in high-purity and in nitrogen-doped tantalum single crystals of different orientations following plastic deformation at 350 or 198/sup 0/K. The experiments showed two damping peaks, one at 150, the other at 250/sup 0/K (frequency f = 17 kHz), which are probably the ..cap alpha..' and the ..cap alpha.. peak. The ..cap alpha..' peak is observed particularly after low-temperature deformation. It is suggested that this peak is related to the thermally activated motions of geometrical kinks in screw dislocations. The ..cap alpha.. peak is thought to be due to the formation of double-kinks in non-screw (71/sup 0/) dislocations.

• Research Organization: Univ., Stuttgart
• OSTI ID: 7251879
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 24:6; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CRYSTAL DEFECTS
CRYSTAL DOPING
CRYSTAL STRUCTURE
CRYSTALS
DISLOCATIONS
ELEMENTS
FRICTION
INTERNAL FRICTION
LINE DEFECTS
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
NITROGEN ADDITIONS
REFRACTORY METALS
TANTALUM
TRANSITION ELEMENTS
VERY LOW TEMPERATURE