Original scientific paper

Agglomeration of vacancies in pure fast-quenched aluminium*)

E. Girt ; Metal Physics Laboratory, Department of Natural Sciences, University of Sarajevo, Sarajevo
B. Leontić ; Metal Physics Laboratory, Department of Natural Sciences, University of Sarajevo, Sarajevo
A. Kuršumović ; Metal Physics Laboratory, Department of Natural Sciences, University of Sarajevo, Sarajevo

Abstract

In order to observe the migration of vacancies in pure aluminium the metal was fast-quenched („splat“-cooled) and immediately upon forming stowed in liquid nitrogen. Samples thus conserved were subjected to resistometric observation from 77 K to room temperature. They were then cooled once more to 77 K and the measurement of electrical resistance repeated. The results indicate that in the interval of 77 K to 170 ± 5 K the values of electrical resistance in the two sets of measurements differ, being larger in the first. The effect is tentatively interpreted as the agglomeration of monovacancies into clusters since during the first set of measurements the electrons were scattered by a greater number of centers while during the second set of measurements these centers decreased in number. The results suggest that all monovacancies probably disappear already at about 170 K.

Keywords

Hrčak ID:

327893

URI

https://hrcak.srce.hr/327893

Publication date:

4.4.1977.

Article data in other languages: bosnian

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