Interaction of interstitial atoms with dislocations in metals

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5368452

Weller, M ^[1]

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1. Institut fur Werkstoffwissenschaften, Stuttgart (Germany, F.R.)

Internal friction of {alpha}-Fe and group V transition metals containing the interstitial solute atoms C, N and O display Snoek-Koster peaks at temperatures substantially higher than the corresponding Snoek peaks. Peak position and height depend on degree of cold work and interstitial content. Experiments on monocrystals of Nb-O, Ta-O and Fe-N clearly indicate that there exist two relaxation processes: SK-1 (the classical cold-work peak) and another peak, SK-2. In a recent theory the SK relaxation is attributed to thermally activated formation of kink pairs in a a/2 <111> screw dislocation in the presence of interstitials. Basic assumptions and atomistic parameters within this theory are in agreement with experiments; it is especially able to explain that the high temperature SK-2 peak may have a lower activation enthalpy than the low temperature SK-1 peak.

• OSTI ID: 5368452
• 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

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
CARBON
COLD WORKING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
DISLOCATIONS
ELEMENTS
ENTHALPY
FABRICATION
FRICTION
INTERSTITIALS
IRON
IRON-ALPHA
KINETICS
LINE DEFECTS
MATERIALS WORKING
METALS
NIOBIUM
NITROGEN
NONMETALS
OXYGEN
PHYSICAL PROPERTIES
POINT DEFECTS
RELAXATION
SCREW DISLOCATIONS
STRESS RELAXATION
TANTALUM
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS