Investigation of Sulphur Nanoclusters in Ageing Ni-S System after Irradiation and Thermal Treatment by Positron Annihilation

• Authors: D. Perminov , A. Druzhkov , V. Arbuzov , S. Danilov
• Languages of publication: EN

Abstracts

EN

The pure Ni and Ni-S ageing systems, thermally aged and also irradiated by 5 MeV electrons at 270 K with subsequent annealing, are studied by means of positron annihilation spectroscopy. The formation of ultrafine S-rich precipitates (clusters) is observed in Ni-S during thermal ageing at about 650 K. It is assumed that these clusters do not contain vacancy-type defects and they are coherent to the Ni matrix. The positrons localize in sulphur clusters that is due to affinity-induced confinement. In irradiated Ni-S system, the mobile vacancy-S atom complexes are formed at post-irradiation annealing above 350 K (stage III). These complexes form the three-dimensional vacancy clusters (nanovoids) decorated with S atoms. The radiation induced nucleation of S-rich clusters occurs when nanovoids dissociate.

Keywords

EN

81.30.Mh; 61.80.Fe; 64.75.Op

Discipline

• 61.80.Fe: Electron and positron radiation effects
• 81.30.Mh: Solid-phase precipitation(for precipitation hardening, see 81.40.Cd)
• 64.75.Op: Phase separation and segregation in alloying

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 3
• Pages: 729-732

Dates

published

2014-03

Contributors

author

D. Perminov

• Institute of Metal Physics, Ural Branch of Russian Academy of Science S. Kovalevskaja Str. 18, 620990 Ekaterinburg, Russian Federation

author

A. Druzhkov

• Institute of Metal Physics, Ural Branch of Russian Academy of Science S. Kovalevskaja Str. 18, 620990 Ekaterinburg, Russian Federation

author

V. Arbuzov

• Institute of Metal Physics, Ural Branch of Russian Academy of Science S. Kovalevskaja Str. 18, 620990 Ekaterinburg, Russian Federation

author

S. Danilov

• Institute of Metal Physics, Ural Branch of Russian Academy of Science S. Kovalevskaja Str. 18, 620990 Ekaterinburg, Russian Federation

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Identifiers

DOI

10.12693/APhysPolA.125.729