Untersuchung atomarer Fehlstellen in verformtem und abgeschrecktem Silber

Ramsteiner, F.; Schüle, W.; Seeger, A.

doi:10.1002/pssb.19620020806

Cited by 35 publications

(3 citation statements)

References 21 publications

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“…In the case of our measurements the absence of a well defined quadrupole frequency related to the trapping of dislocations at indium can suggest that In-dislocation interaction in silver is very weak. The comparison of observed recovery temperatures with the results of hardness [26,35], residual resistivity [26,30,35] and positron lifetime experiments [36] in deformed silver is shown in figure 5 , where the values of recovery stage V temperatures in silver are drawn as a function of the deformation degree. Our results are in good agreement with the general trend, although a little deviation in the direction of higher temperatures is observed which may be the consequence of insufficient purity of samples.…”

Section: A4ffg2(t) =A;ff [(L -F>zs2n Cos Nmentioning

confidence: 98%

TDPAC studies on the recovery of Ag plastically deformed at room temperature

Wodniecka

Marszałek

Wodniecki

1989

J. Phys.: Condens. Matter

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The recovery of polycrystalline silver rolled at room temperature to different degrees of deformation (33, 48, 73 and 95%) was investigated by means of the TDPAC technique with a 111Cd probe. The dependence of quadrupole interaction parameters, extracted from time spectra, on the degree of deformation and annealing temperature was studied. At temperatures in the range 350-425 K the recovery stage occurs which is indicated by the decrease of quadrupole interaction. For lower degrees of deformation also a small fraction ( approximately 2%) of sharp quadrupole frequency of 38(1) MHz was detected after annealing at temperatures 300-375 K, associated with vacancy complexes trapped on probe atoms.

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Section: A4ffg2(t) =A;ff [(L -F>zs2n Cos Nmentioning

confidence: 98%

TDPAC studies on the recovery of Ag plastically deformed at room temperature

Wodniecka

Marszałek

Wodniecki

1989

J. Phys.: Condens. Matter

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“…B. [14]), die hohere Aktivierungsenergie E > 1,30 eV als Wanderungsenergie fur Einfachleerstellen aufgefaot werden. Die Leerstellenkonzentration liegt dabei allerdings in der gleichen GroDenordnung wie die drr Fremdatome in 99,999% reinem Material, so da13 eine Wechselwirkung zwischen Leerstellen und Fremdatomen nicht ausgeschlossen ist [ 101.…”

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Leerstellenausheilung in Platin nach Abschrecken unter Argonatmosphäre und in Wasser

Rattke¹,

Hauser²,

Wieting³

1969

Physica Status Solidi (b)

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a), 0. HAWSER (b) und J. WIETING (a) Es wird iiber Untersuchungen zum Ausheilverhalten abgeschreckter Platinproben in Abhtingigkeit von der Abschrecktemperatur, der Abschreckgeschwindigkeit und vom pbysikalischen Zustand der Proben berichtet. Dabei zeigt es sich, daB niedrige Wanderungsenergien fur Leerstellen von 1,0 bis 1,1 eV unabhangig von der eingefrorenen Leerstellenkonzentration immer dann erhalten werden, wenn bereits vor dem Abschrecken eine hohe Versetzungsdichte vorliegt oder wenn bei hohen Abschreckgeschwindigkeiten durch Verformungen wahrend des Abschreckens die Senkendichte verandert wird. Hohere Wanderungsenergien von 1,3 bis 1,4 eV treten bei gut vorgegluhtem Material und hinreichend langsamen Abschreckgeschwindigkeiten ebenfalls unabhangig von der Leerstellenkonzentration auf. Sie sollten der freien Wanderung von Einzelleerstellen zugeschrieben werden, wahrend die kleineren Energien zusatzliche Wechselwirkungen mit den Senken enthalten. Unter diesen Umstanden stellt die chemische Reaktionsgleichung keine gute Ntiherung fur die Beschreibung des Ausheilvorganges dar. Ein EinfluB von Doppelleerstellen auf die Ausheilung kann erst erfaBt werden, wenn bei hinreichend senkenarmem Material eine Verformung wahrend des Abschreckens ausgeschlossen werden kann.The report deals with the recovery of platinum wires in dependence on the temperature, quenching rate, and the physical state of the platinum samples. Herewith it is shown that low vacancy migration energies (1.0 to 1.1 eV) always can be obtained independent of the concentration of the quenched-in vacancies if already before the quenching a high density of dislocations exists or if a t high quenching rates a change in the density of sinks occurs due to deformation. Higher migration energics (1.3 to 1.4 eV) are observedalso independent of the concentration of vacanciesif the samples are well annealed and the quenching rate is sufficiently slow. It seems reasonable to assign them to the free migration of monovacancies. The smaller energies contain an additional interaction with the sinks. Under these conditions the chemical rate equation gives no good approximation for the description of the recovery. An influence of divacancies will only be obtained if the samples have a sufficiently small density of sinks and a deformation during quenching may be excluded.

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“…We assume that the energy parameters for the motion of point defects in the Ag + 8.75 a t % Zn alloy differ negligibly from those in the pure silver. The most correct value EL for silver is equal to 0.88 eV [17]. The value EL should be = 0.1 eV assuming the migrating interstitials to be a t the substage I, or EL = 0.67 eV [lS] and to move at stage 111 recovery.…”

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confidence: 99%

Radiation-enhanced diffusion in metals. Ordering in annealed silver-zinc alloys

Bystrov

Ivanov

Platov

1971

Phys. Stat. Sol. (a)

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By the method of resistivity measurement at −197 °C, ordering in the annealed Ag+ +8.75 at% Zn alloy samples has been investigated under electron irradiation of 2.3 MeV, at temperatures from −20 to +190 °C and electron fluxes from 9.35 × 1012 to 4.66 × 1013 cm−2 s−1. The resistivity change during the ordering has been found to obey the second order kinetics. The temperature dependence of the radiation‐enhanced diffusion coefficient is described by an exponential with an activation energy of 0.41 eV. The diffusion coefficient varies as the square root of electron fluxes. Analysis of the results obtained led to a conclusion that in a well‐annealed metal (small concentration of dislocations) the radiation‐enhanced diffusion is steady. Annihilation of interstitials and vacancies is the diffusion controlling process, the motion of interstitials in the dumbbell configuration being responsible for contribution to the diffusion flow.

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Untersuchung atomarer Fehlstellen in verformtem und abgeschrecktem Silber

Cited by 35 publications

References 21 publications

TDPAC studies on the recovery of Ag plastically deformed at room temperature

TDPAC studies on the recovery of Ag plastically deformed at room temperature

Leerstellenausheilung in Platin nach Abschrecken unter Argonatmosphäre und in Wasser

Radiation-enhanced diffusion in metals. Ordering in annealed silver-zinc alloys

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