Critical test of radiation-damage models by means of dislocation pinning experiments on copper

Lauzier, J.; Minier, C.; Seeger, A.

doi:10.1080/14786437708232982

Cited by 13 publications

(5 citation statements)

References 13 publications

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“…I n the form in which it is generally used the term displacement threshold energy, Ed, refers to a very special physical situation which under certain conditions may be met at liquid-helium temperatures (THe).Therefore, as discussed in detail in [lo], the threshold energy concept has t o be reconsidered if experimental results are to be interpreted which refer to elevated temperatures. Atom displacement is monitored during irradiation by measuring the change of a n experimental parameter which depends on Frenkel pair production rate, P ( E , 0) = C i a 3 (1)…”

Section: Effective Displacement Threshold Energymentioning

confidence: 99%

Temperature dependence of the threshold energy for atom displacement in irradiated molybdenum

Zag

Urban

1983

Phys. Stat. Sol. (a)

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The effective threshold energy for atom displacement is measured in molybdenum single crystals in a high-voltage electron microscope. Displacement is monitored at 70 K 5 T 5 300 K by observing the nucleation of interstitial dislocation loops, and at 500 K 5 T 800 K by measuring the growth rate of previously induced loops. By use of reference irradiations the results of both methods may be calibrated to allow comparison over the whole temperature range covered. At 70 K T 5 5 150 K the effective threshold energy for irradiation along a (lOO)-direction is found to have a constant value of (34.5 & 0.5) eV. Above this range the threshold energy decreases continuously with temperature to (26.5 f 0.5) eV a t 800 K. The role of subthreshold processes is discussed. It is found that such processes contribute. little to the displacement cross section. The observed temperature dependence of the displacement threshold energy is explained i n terms of the effect of thermal vibrations on the production of stable Frenkel pairs. Die effektive Schwellenenergie fiir Atomverlagerung wird an Molybdiineinkristallen im Hochspannungselektronenmikroskop gemessen. Zwischen 70 und 300 K dient als Kriterium fiir Verlagerung die Keimbildung von Zwischengitteratomversetzungsringen, bei Temperaturen von 500 bis 800 K wird das Wachstum von vorbestrahlten Ringen dieses Typs beobachtet. Durch Eichbestrahlungen konnen die Egebnise beider Melmethoden auf die gleiche Skala reduziert werden. Das erlaubt einen Vergleich der gewonnenen Werte uber den gesamten untersuchten Temperaturbereich. Zwischen 70 und 150 K weist die effektive Schwellenenergie fur Bestrahlungen parallel zu einer (100)-Gitterrichtung einen konstanten Wert von (34,5 f 0,5) eV auf. Fiir hohere Temperaturen nimmt diese GroDe kontinuierlich ab bis sie bei 800 K einen Wert von (26,5 f 0,5) eV annimmt. Eine Untersuchung der Auswirkung unterschwelliger Verlagerungen zeigt, dd3 d c h e Ereignisse wenig zum Wirkungsquerschuitt fiir Atomverlagerung beitragen. Die beobachtete Temperaturabhiingigkeit der Verlagerungsschwellenenergie wird durch den EinfluD thermischer Schwingungen auf die Eneugung stabiler Frenkelpaare erkliirt.

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Section: Effective Displacement Threshold Energymentioning

confidence: 99%

Temperature dependence of the threshold energy for atom displacement in irradiated molybdenum

Zag

Urban

1983

Phys. Stat. Sol. (a)

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“…The best value of pFp for free vacancies and free SIA's is 9. 5 x Rcm [19]; $p is probably not much less [25, 261, it will be taken as 9 x 10-4 Qcm. From the measured initial slopes in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The measured beam current was 3.5 x 10-6A/cm2 in set A and 1. 5 x loW6 A/crn2 in set B. The difference in temperature over a specimen gage length due to beam heating was less than 3 K in set A.…”

Section: Methodsmentioning

confidence: 93%

“…The first evidence for conversion was provided by dislocation pinning measurements in copper [3]. Several ohject,ions were raised to the above work [4]; but recent, considerably refined measurements of the change in modulus decrement with irradiation temperature have supported the original interpretation [5]. Some limited nieasurements indicate that the temperature dependence of the defect pinning rate in nickel fits the same pattern [6].…”

Section: Introductionmentioning

confidence: 99%

“…where the C i T are the concentrations of each type of t,rap operative a t T I and Kira is the interaction radius of crowdions with the i-th trap, equation (5) can be generalized to give t,he probability that an off-line crowdion will react with neither a trap nor a vacancy before it is converted by thermal activation into an immobile dunibbell. This probability is…”

Section: Introductionmentioning

confidence: 99%

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A study of thermal conversion of interstitials in platinum by means of electrical resistivity measurements

Jackson¹,

Ryan²,

Lwin³

1979

Phys. Stat. Sol. (a)

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The initial rates of resistivity increase in platinum specimens with many different concentrations of vacancies injected by quenches are measured during electron irradiations at temperatures between 80 and 200 K. The ratio of the initial rate in a quenched specimen to that in a specimen well annealed before irradiation decreases with increasing vacancy concentration; but these ratios are nearly independent of irradiation temperature over this range. Thermal conversion of interstitials in platinum is negligible below 200 K.

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Figs. 95 - 129

Jung¹

Atomic Defects in Metals

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Critical test of radiation-damage models by means of dislocation pinning experiments on copper

Cited by 13 publications

References 13 publications

Temperature dependence of the threshold energy for atom displacement in irradiated molybdenum

Temperature dependence of the threshold energy for atom displacement in irradiated molybdenum

A study of thermal conversion of interstitials in platinum by means of electrical resistivity measurements

Figs. 95 - 129

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