Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.26: Poster

Dienstag, 21. März 2017, 18:30–20:30, P4

Grain refinement in ball-milled nanocrystalline iron-boron — •Max Steinbrück — IMP Universität Göttingen

In this thesis, iron-boron alloys were produced and the influence of the concentration of boron on the grain size was investigated. In theory, the relatively small boron atoms should segregate to the grain boundaries of iron. This reduces the surface energy of the grains and therefore favors the formation of grain boundaries and reduces grain growth. To investigate this, Fe and FeB powder were ball-milled to produce alloys with different boron concentrations. The grain size was determined by transmission electron microscopy and x-ray diffraction. It could be shown that in the investigated interval up to 17,3 at.% the grain size decreases with increasing boron concentration. The thermal stability of the powder was examined by differential scanning calorimetry, where a phase transition while heating and the formation of a Fe2B phase were observed. The results were connected to previous works on iron-oxygen and iron-carbon systems.