FeAl intermetallic with addition of 2 and 10 vol.% Al2O3
Stefan Szczepanik*, Elżbieta Godlewska** *Akademia Górniczo-Hutnicza, Wydział Metalurgii i Inżynierii Materiałowej, al. Mickiewicza 30, 30-059 Kraków **Akademia Górniczo-Hutnicza, Wydział Inżynierii Materiałowej i Ceramiki, al. Mickiewicza 30, 30-059 Kraków
Annals 3 No. 8, 2003 pages 421-427
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abstract The paper presents the results of preliminary studies on composites with an FeAl (40 at% Al) matrix and Al2O3 dispersions obtained by self-propagating high-temperature synthesis (SHS) and hot forging. Compact blocks were obtained from homogenous mixtures of iron, aluminium and Al2O3 powders. The Al2O3 powder was added in the amount of 2 or 10% by volume. The influence of deformation on density and mechanical properties (bending strength) has been determined. The composites with the FeAl matrix, obtained from powder substrates, have a good formability upon hot forging. The investigations have shown an advantageous effect of hot forging on density of the SHS products and their mechanical properties. The amount of the dispersed phase and deformation parameters, both influence the density, mechanical properties (Tables 1 and 2) and structure (Figs. 3-4, 5-8). Al2O3 added in the amount of 2 or 10 vol.% occurs in the form of fine particles and strongly affects the mechanical properties of the obtained materials at room temperature. Destruction surface of deformed material with height reduction of 72% has a fibre structure. Key words: FeAl intermetallics, composites, oxide dispersions, hot forging