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Studium mikrostruktury ultrajemnozrnných kovových materiálů metodou pozitronové anihilace
 Barnovská, Zuzana ; Čížek, Jakub (advisor) ; Procházka, Ivan (referee)
In the presented thesis we study the changes in distribution of the size of vacancy clusters in metals processed by severe plastic deformation, so called ul- tra fine grained materials. We use a modern non-destructive method of positron annihilation spectroscopy, which is one of the few methods that allow us to inves- tigate point defects like vacancies with sizes of a few ˚A. The obtained spectra of positrons annihilating in the samples enable us to determine changes of vacancy cluster sizes depending on temperature or severity of the deformation applied on the samples. 1
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