Browsing by Subject "natural composite"

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Access status: Open Access ,
Synthesis and evaluation of the structure of $Ni_{3}Al/C$ alloy
(2009) Kmita, Angelika; Janas, Andrzej Bogusław; Hutera, Barbara
The article specifies a method used for the manufacture of a new Ni-Al-C alloy with the description of alloy microstructure. When proper conditions are maintained, the said alloy after solidification forms a natural 'in situ' $Ni_{3}Al/C$ composite. Particular attention was paid to the process of synthesis of $Ni_{3}Al$ phase by the technique of cost-effective melting and to the process of the formation of different graphite forms after the solidification in ceramic mould of casting characterised by different wall cross-sections, and hence by different heat transfer rates. Metallographic examinations were carried out by the commonly used techniques and by scanning electron microscopy. The use of the latter enabled the determination of the chemical composition of phases formed during casting process. The aim of the present studies was to evaluate the microstructure of this unique alloy. The phase morphologies were examined and their chemical composition was determined. These fundamental studies should enable the determination of conditions under which the graphite eutectic is formed in Ni-Al alloy and, as a consequence, the synthesis of $Ni_{3}Al/C$ composite.