Influence of interstitial impurity atoms on point defect relaxation in neutron-irradiated iron

Book · Mon Jan 01 04:00:00 EST 1973

OSTI ID:4405254

Weller, M; Diehl, J

From fifth international conference on internal friction and ultrasonic attenuation in crystalline solids; Aachen, Germany (27 Aug After low-temperature irradiation with neutrons, the internal friction of iron wires was measured between 80 and 52O deg K at 1 Hz; the interstitial impurity concentration varied between 1 and 60 wt. ppM N or C. Among the intrinsic point-defect internal friction peaks, which are observed below 300 deg K, only peak I/sub E+/, being assigned to the relaxation of an interstitial configuration, is strongly influenced by impurities. Its suppression with increasing C or N concentration is interpreted as trapping of Fe interstitials and propagating as replacement collision chains at impurity atoms. At temperatures (above 30 deg K), at which C and N become mobile, the impurities react with remaining point defects, which leads to an additional relaxation peak at approximately 90 deg C. This peak was studied with respect to kinetics of formation, strength, and activation energy of relaxation, dependence on impurity concentration, and annealing behavior. It is most likely caused by a complex consisting of N and a vacancy. (GE)

• Research Organization: Max-Planck-Institut fuer Metallforschung, Stuttgart
• NSA Number: NSA-29-003105
• OSTI ID: 4405254
• Country of Publication: Germany
• Language: English

Related Subjects

*IRON-- POINT DEFECTS
ANNEALING
CARBON ADDITIONS
HIGH TEMPERATURE
IMPURITIES
INTERNAL FRICTION
INTERSTITIALS
LOW TEMPERATURE
MEDIUM TEMPERATURE
N50240* --Metals
Ceramics
& Other Materials--Metals & Alloys--Radiation Effects
NEUTRON BEAMS
NEUTRONS
NITROGEN ADDITIONS
RELAXATION
WIRES