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Abstract

Surface prospection at site 5 in Nieprowice, Pińczów county, Świętokrzyskie voivodship, revealed a quite large series of Roman coins (33 specimens), accompanied by numerous and differentiated artefacts of the Przeworsk culture. Many of the artefacts are metal decorations and elements of dress that usually provide precise dating of archaeological sites. Site 5 at Nieprowice was occupied by people of the Przeworsk culture beginning with phase A2 of the younger Pre-Roman Period to the beginning of the Migration Period. The coins are exceptionally abundant and they are more differentiated than it is usual in surface prospection on the sites of the Przeworsk culture settlements, hence this place could be a central settlement in the region.
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Abstract

Fabrication and microstructure of the AlSi11 matrix composite containing 10 % volume fraction of CrFe30C8 particles were presented in this paper. Composite suspension was manufactured by using mechanical stirring. During stirring process the temperature of liquid metal, time of mixing and rotational speed of mixer were fixed. After stirring process composite suspension was gravity cast into shell mould. The composites were cast, applying simultaneously an electromagnetic field. The aim of the present study was to determine the effect of changes in the frequency of the current power inductor on the morphology of the reinforcing phase in the aluminum matrix. The concept is based on the assumption that a chromium-iron matrix of CrFe30C8 particles dissolves and residual carbide phases will substantially strengthen the composite. The microstructure and interface structure of the AlSi11/CrFe30C8 composite has been studied by optical microscopy, scanning microscopy and X-ray diffraction.
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