Magnetic disaccommodation of hydrogen and dislocations in metals

Kronmüller, H.; Steeb, H.; König, N.

doi:10.1007/bf02722488

Cited by 38 publications

(7 citation statements)

References 27 publications

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“…From inspection of these results, it becomes apparent that, up to now, no SnoekRichter ± ± type relaxation has been observed as yet in H-charged a-Fe [196,201,204,207]. This is also true for a recent investigation, performed by Hirscher [210] on H-and deuterium (D)-charged, unirradiated and e À -irradiated a-Fe.…”

Section: Maes In Fehmentioning

confidence: 70%

A Review of the Magnetic Relaxation and Its Application to the Study of Atomic Defects in ?-Iron and Its Diluted Alloys

Blythe

Kronmüller²,

Seeger³

et al. 2000

phys. stat. sol. (a)

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This review presents a comprehensive survey on intensive studies performed during the last decades on point defect reactions on a-iron (a-Fe) and its diluted alloys. Our intention is to give an actual account of the knowledge accumulated on this subject, as it has been obtained predominantly by means of the magnetic after-effect (MAE) spectroscopy. After a concise introduction into the theoretical and experimental fundamentals of this technique, the main concern is focused on the presentation and detailed discussion of the MAE spectra arising ± ± after low-temperature electron (e À )-or neutron(n)-irradiation and subsequent annealing ± ± in: (i) high-purity a-Fe and a-Fe doped with (ii) substitutional solutes (like Ni, V, Al, Cu, Ti, Be, Si, Mn, . . .) or (iii) interstitial solutes (like O, H, C, N). During the course of systematic annealing treatments, these respective spectra undergo dramatic variations at specific temperatures thereby revealing in great detail the underlying intrinsic reactions of the radiation-induced defects, i.e., reorientation, migration, clustering, dissolution and finally annihilation. In alloyed Fe systems the corresponding reaction sequences are even multiplied due to additional interactions between defects and solute atoms. Most valuable information concerning formation-, dissociation-and binding enthalpies of small, mixed clusters (of the type C i V k , N i V k ; i; k ! 1) has been obtained in highpurity a-Fe base material which, after charging with C or N, had been e À -irradiated. Concerning the basic recovery mechanisms in a-Fe, two complementary results are obtained from the analysis of the various systems: (i) in high-purity and substitutionally alloyed a-Fe the recovery in Stage-III (200 K) is governed by a three-dimensionally migrating (H M I 0:56 eV) stable interstitial (dumbbell); (ii) following the formation and dissociation kinetics of small clusters (C 1 V k , N 1 V k ) in interstitially alloyed a-Fe the migration enthalpy of the monovacancy must hold the following relation H M N (0.76 eV) < H M C (0.84 eV) < H M V1 . These results are in clear agreement with the socalled two-interstitial model (2IM) in a-Fe ± a conclusion being further substantiated by a systematic comparison with the results obtained from nonrelaxational techniques, like i.e. positron annihilation (PA), which by their authors are preferentially interpreted in terms of the one-interstitial model (1IM).Die vorliegende Arbeit gibt einen umfassenden Ûberlick u È ber die wa È hrend der letzten Jahrzehnte durchgefu È hrten, eingehenden Untersuchungen der Punktfehler-Eigenschaften in a-Eisen (a-Fe) und verdu È nnten Fe-Legierungen. Demgema È û ist diese Zusammenfassung gedacht als ein dem gegenwa Èrtigen Kenntnisstand entsprechender Rechenschaftsbericht u È ber die auf diesem Gebiet, hauptsa È chlich mit Hilfe der magnetischen Nachwirkungs (MNW) ± ± Spektroskopie, gewonnenen, tiefreichenden Einsichten in diesen Problemkreis. Nach einer kurzen Einfu È hrung in die theoretischen und experimentellen Grundlagen di...

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Section: Maes In Fehmentioning

confidence: 70%

A Review of the Magnetic Relaxation and Its Application to the Study of Atomic Defects in ?-Iron and Its Diluted Alloys

Blythe

Kronmüller²,

Seeger³

et al. 2000

phys. stat. sol. (a)

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“…The slope in Fig The change of shape and position of the hydrogen cold-work peak by annealing was observed in iron charged with hydrogen [ 12 to 161. Kronmiiller et al investigated the influence of annealing a t about room temperature on the hydrogen cold-work peak by means of magnetic after-effect measurement [13]. They showed that the peak position shifts to lower temperatures by annealing and disappears finally.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen cold-work peak in high-purity molybdenum

Suzuki

1989

Phys. Stat. Sol. (a)

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The internal friction of high‐purity molybdenum is measured in the temperature range 20 to 600 K at frequencies of 0.5 to 20 Hz, after plastic deformation and electrolytic charging with hydrogen. A new peak is found near 350 K which can be assigned to a hydrogen cold‐work peak (hydrogen Snoek‐Köster relaxation). The peak shifts to lower temperatures by heating above 350 K and finally disappears. This annealing process has an activation enthalpy of about 0.77 eV. The activation enthalpy of the hydrogen cold‐work peak is measured by the peak shift method below a temperature where the peak is stable. It is about 0.38 eV, which is consistent with the theory of kink pair formation in the cold‐work peak.

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“…SnoekKöster-relaxation. Interestingly, magnetic relaxation peaks which were associated to the thermal activation of dislocations are observed at 18 K, 430 K, 513 K and 625 K [14,15,17,18]. The properties of high temperature peaks strongly depend on carbon content, so they are assigned as the magnetic analogue of Snoek-Köster relaxation process.…”

Section: Introductionmentioning

confidence: 99%

“…However, clear correspondence between dislocation-relaxation processes in the IF and MAE experiments is not yet established, in spite the fact that in both experiments dislocation-relaxation processes have been observed and reported [3,10,11,12,13,14,15,16]. Such thermally-activated relaxation processes occur as a consequence of dislocation moving in a periodic lattice potential i.e.…”

Section: Introductionmentioning

confidence: 99%

Magnetic after-effect study of dislocation relaxation in Fe-based alloys

Minov¹,

Dupré²,

Konstantinović³

2011

J. Phys. D: Appl. Phys.

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To cite this version:B Minov, L Dupré, M J Konstantinović. Magnetic after-effect study of dislocation relaxation in Fe-based alloys. Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (30) Abstract. Dislocation-related relaxation processes are studied by measuring the magnetic after-effect spectra as a function of temperature in a variety of non-deformed and cold-worked iron alloys. In the α-Fe and Fe-1%Cu alloys the peak centered at about 320 K appears as a consequence of plastic deformation. On the basis of the behavior of its parameters, such as the temperature position of the peak, the full width at half maximum, and the integrated intensities, this feature is assigned to the relaxation process of thermally-activated dislocation motion.

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Magnetic disaccommodation of hydrogen and dislocations in metals

Cited by 38 publications

References 27 publications

A Review of the Magnetic Relaxation and Its Application to the Study of Atomic Defects in ?-Iron and Its Diluted Alloys

A Review of the Magnetic Relaxation and Its Application to the Study of Atomic Defects in ?-Iron and Its Diluted Alloys

Hydrogen cold-work peak in high-purity molybdenum

Magnetic after-effect study of dislocation relaxation in Fe-based alloys

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