Low-Temperature Magnetic Relaxation in Neutron-Irradiated α-Iron

Measurements of the low-temperature magnetic after-effect are made on α-iron samples after neutron irradiation to various doses at 77 or 320 K. In samples which are either cold-worked or charged with hydrogen before irradiation no relaxation peak is observed in the temperature region below 30 K. Samples doped with carbon prior to irradiation exhibit a well defined relaxation peak at 18 K. The results are analysed and the relaxation is discussed in terms of a model in which kink pairs are formed on dislocation loops produced by carbon agglomerates. An α-Eisen wird die magnetische Tieftemperaturnachwirkung nach Neutronenbestrahlung bei 77 bzw. 320 K und verschiedenen Dosen gemessen. In Proben, die vor der Bestrahlung kaltverformt bzw. mit Wasserstoff dotiert werden, wird unterhalb 30 K kein Relaxationsmaximum beobachtet. Proben, die vor der Bestrahlung mit Kohlenstoff dotiert werden, zeigen ein wohldefiniertes Maximum bei 18 K. Die Ergebnisse werden analysiert und an Hand eines Modells diskutiert, in dem Kinkpaare auf kleinen Versetzungsringen gebildet werden, die durch Kohlenstoffagglomerate erzeugt wurden.

[1]  J. Dufresne,et al.  On the question of low‐temperature magnetic relaxation in pure iron , 1977 .

[2]  V. Hivert,et al.  Internal friction peaks due to dislocation relaxations in plastically deformed and/or irradiated high‐purity α‐iron , 1977 .

[3]  H. Blythe,et al.  Low temperature magnetic disaccommodation in neutron irradiated iron , 1976 .

[4]  J. Dufresne,et al.  Hydrogen relaxation in α-iron , 1976 .

[5]  H. Kronmüller,et al.  Magnetic disaccommodation of hydrogen and dislocations in metals , 1976 .

[6]  H. Kronmüller,et al.  Investigations on the cold-work peak of hydrogen in iron by means of the magnetic after-effect , 1975 .

[7]  H. Kronmüller.  Theory of magnetic cold-work peak in ferromagnetic materials , 1974 .

[8]  F. Walz.  Ein vollständig automatisiertes Meßverfahren zur Bestimmung der magnetischen Nachwirkung in ferromagnetischen Kristallen , 1974 .

[9]  K. Sakamoto,et al.  Effect of solute nitrogen on the low temperature internal friction peak in deformed α-iron , 1973 .

[10]  H. Birnbaum,et al.  Magnetic relaxation studies of hydrogen in iron: Relaxation spectra , 1973 .

[11]  H. Kronmüller,et al.  On magnetic after-effects of hydrogen in α-iron , 1973 .

[12]  C. Wert,et al.  The cold-work peak in undeformed niobium☆ , 1971 .

[13]  K. Sakamoto,et al.  Low temperature internal friction in deformed α-iron , 1970 .

[14]  A. Damask,et al.  Kinetics of carbon precipitation in irradiated iron—IV electron microscope observations , 1964 .

[15]  W. Heller.  Quantum effects in diffusion: Internal friction due to hydrogen and deuterium dissolved in α-iron , 1961 .

[16]  D. Hull,et al.  PRECIPITATION AND IRRADIATION HARDENING IN IRON , 1961 .