Fyzikální ústav Akademie věd ČR

Selected results of department 17

Grain boundary classification and its consequences for Grain Boundary Engineering

Based on detail study of solute segregation at individual grain boundaries in α-iron, a new classification of [100] tilt grain boundaries was developed.

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Growth of oriented tricrystals

Important step in successful experiment in solid state physics is defined sample. As a representative of such samples are mainly oriented single crystals as well as bicrystals of model systems. Besides these samples, we developed technology of growing unique oriented tricrystals for – even in the world – rare investigation of properties of triple junctions of grain boundaries.

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Prediction of the segregation of any solute at any grain boundary

Grain boundaries are important structural component of materials. Their structure as well as chemical composition differ from those of the crystal interior and thus, they may limit the applicability of the materials. Based on careful study of segregation at individual grain boundaries in model b.c.c. Fe–base alloys we were able to propose and prove a method of the prediction of the segregation of any solute (i.e. its composition) at any grain boundary at chosen temperature.

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Preparation of defined samples using the method of focused ion beam

In cooperation with Bristol university, we proposed a technique for preparation of samples with highly localized in form of thin foils for high-resolution transmission electron microscopy (HRTEM).

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