Mossbauer effect investigation of the vibrational behaviour of interstitials trapped at<sup>57</sup>Co impurities in aluminium

Vogl, G.; Mansel, W.; Vogl, W.

doi:10.1088/0305-4608/4/12/026

Cited by 51 publications

(12 citation statements)

References 16 publications

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“…Granato et al reported ultrasonic measurements on Al-Mg which did not show any strong indications of Mg interstitials in the (100) dumbbell or octahedral configurations [18]. Vogl et al reported interstitial trapping at Co atoms in Al at low temperatures [19]. The experimental data does not give a direct confirmation of the values reported in Table 1, but does give some indirect confirmation of our results.…”

Section: Resultssupporting

confidence: 47%

“…Still, some experimental observations should serve to limit the conditions under which such segregation should be expected. Interstitial trapping at Mn and Co alloy atoms in Al has been observed, but it has also been observed that interstitials trapped at Co and Mn atoms in Al are not present anymore at room temperature [17,19]. We are not certain if this is due to detrapping by thermal vibrations or due to vacancy-interstitial recombination (Al vacancies are also mobile at room temperature).…”

Section: Discussionmentioning

confidence: 95%

“…However, such trapping effects have been studied only for a limited number of dilute alloy elements, e.g. for Co and Mn [17,19]. It has been observed in a number of alloys, e.g., Al-Zn, that irradiation-induced precipitation may occur in association with dislocation loops [4].…”

Section: Introductionmentioning

confidence: 99%

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Density functional theory study of alloy element interstitials in Al

Klaver

Chen²

2004

J Computer-Aided Mater Des

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Density Functional Theory calculations were used to study Mg, Si, Cr, Mn, Fe, Co, Ni, and Cu interstitial configurations in Al. Energies of these elements in (100) dumbbell and octahedral configurations were determined. Results show that it is energetically favourable for metal alloying element atoms to replace Al selfinterstitials if the alloying atoms are smaller than the Al atoms, as expected. The system energy can thus be decreased by up to 2 eV. The difference between the energies of (100) dumbbell and octahedral configurations is only a few tenth eV for the alloys with metallic alloying elements. For Si, the difference can be up to 0.9 eV. This exceptional behavior of Si is most likely due to its angularly dependent bonding characteristics. Short ab-initio Molecular Dynamics simulations were performed on Mg and Si interstitials to allow these systems to evolve into different interstitial configurations rather than just the (100) dumbbell and octahedral configurations. For Si an alternative configuration with tetrahedral-like coordination was found. Consequences of the calculation results for radiation-induced segregation are discussed.

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Section: Resultssupporting

confidence: 47%

Section: Discussionmentioning

confidence: 95%

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Density functional theory study of alloy element interstitials in Al

Klaver

Chen²

2004

J Computer-Aided Mater Des

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“…As a first application of the <( trapprng method >) to microscopic investigations of lattice defects, the dynamic behaviour (the thermal vibrations) of the cobaltatom which forms an <( interstitial complex )) with a trapped aluminum interstitial was studied [65].…”

Section: 13mentioning

confidence: 99%

“…Figure 12 shows the temperature dependence of the DWF between 4.2 and 140 K. The upper curve is for in irradiated sample, t( defect line w in irradiated sample. After Vogt et al [65]. cobalt atoms on substitutional lattice sites-squares for pre-irradiation measurement, circles for those Mossbauer atoms, which even after irradiation have not trapped an interstitial.…”

Section: 13mentioning

confidence: 99%