Internal friction in low temperature irradiated bcc metals

Hivert, V.; Pichon, R.; Bilger, H. R.; Bichon, P.; Verdone, J.; Dautreppe, D.; Moser, P.

doi:10.1016/0022-3697(70)90176-9

Cited by 59 publications

(9 citation statements)

References 11 publications

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“…Later simulation studies found the same for vanadium, a iron, molybdenum, and tungsten (Guinan et al, 1977;Miller, 1981;Taji et al, 1989). For the latter three metals, the structure was confirmed by mechanical relaxation and diffuse X-ray scattering experiments (DiCarlo et al, 1969;Hivert et al, 1970;Mizubayashi, 1973, 1976;Townsend et al, 1976;Okuda, 1977, 1981;Ehrhart, 1978;Grasse et al, 1984;Wallner et al, 1987). Unlike the case of fcc metals, the distortion produced by the h110i dumb-bell interstitial, which is of orthorhombic symmetry, is strongly anisotropic (Schilling, 1978).…”

Section: In Bcc Metalsmentioning

confidence: 55%

Defects in Metals

Numakura

2014

Physical Metallurgy

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Section: In Bcc Metalsmentioning

confidence: 55%

Defects in Metals

Numakura

2014

Physical Metallurgy

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“…Thus, they assumed h110i symmetry for these defects, in agreement with the dumb-bell configuration to which they had previously [108] been assigned. Weller et al [109,110] and subsequently Wolf et al [111,112], continued these symmetry investigations by means of IF and Fe single crystals and found their results to be compatible with an h111i anisotropy of the Stage I defect, as would be expected for the crowdion interstitial configuration (cf.…”

Section: The Process At 110 K (Stage I)mentioning

confidence: 59%

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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“…Internal friction data on neutron irradiation defects recovering in stage I of resistivity are also plotted (9). All the points a r e , with good approximation, on a straight line, thus corresponding to a single reorientation energy:…”

Section: I00mentioning

confidence: 99%

“…3. Arrhenius plot of the reorientation time constants given by our experiments, by magnetic after-effect (8) and by internal friction (9) -T(xl structure). Macroscopically , this substructure gives a uniaxial magnetic anisotropy (7), the direction of which is, in polycrystals, the magnetization direction during the thermal 90…”

mentioning

confidence: 98%

Magnetic Anisotropy Induced by Self‐Interstitials in Low Temperature Electron Irradiated Iron

Verdone¹,

Chambron²,

Moser³

1974

Physica Status Solidi (b)

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After irradiation, iron (l), nickel (2), o r cobalt (3) presents an important magnetic after-effect zone which anneals out at the end of the stage I of the resistivity recovery. It was attributed, either to the one-dimensional migration of the crowdion (4) which reduces the permeability by a Dietze mechanism (5), o r to the three-dimensional migration and reorientation of a split interstitial. In this case, the magnetic after effect results from a NBel mechanism (6).Magnetic torque measurements made under saturating magnetic field can answer this question. This paper gives the results for iron.Experiments The samples are discs of polycristalline high purity iron ( @ 7 mm; e = 0.2 mm). They were irradiated, at 20 K, by 3 MeV electrons (dose 10l8 electrons, cm ) and transferred, at 77 K, into a torque measurement apparatus, which operates under saturating magnetic field (3400 Oe). Magnetic anisotropy is studied by measuring the torque exerted on the disc by a magnetic field applied in the plane of the disc successively along 18 different directions making angles 0 with an arbitrary diameter used a s origin. Measurements are made at a reference temperature T = 92 K , at which no evolution of the measured torques is observed.In the first experiment, the sample undergoes an isothermal treatment at T = 103 K , the magnetic field being at 0 . At given times, the thermal treatment is stopped, the temperature i s lowered down to 92 K, and measurements a r e made a s described above. The results show that, during the thermal treatment, a uniaxial 0 magnetic anisotropy develops slowly. This anisotropy can be written

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Internal friction in low temperature irradiated bcc metals

Cited by 59 publications

References 11 publications

Defects in Metals

Defects in Metals

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

Magnetic Anisotropy Induced by Self‐Interstitials in Low Temperature Electron Irradiated Iron

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