Multiphase niobium aluminides fabricated via reaction synthesis
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Niobium aluminides have been considered as a potential high temperature structural material [ 1, 2, 3]. They are expected to exhibit high elastic stiffness, strength and creep resistance at elevated temperatures. One of the notable advantages of niobium aluminides are the high melting points (which can be seen on the phase diagram in Fig. 1) compared to those of other, more commonly considered aluminide systems. Titanium and nickel alumindes are generally limited to structural applications below 1000 °C [ 5, 6], however, niobium aluminides can have extremely high strength even above 1200 °C and the incorporation of ductile reinforcements of metallic niobium can be used to lower the ductile to brittle transition temperatures and increase room temperature fracture toughness [ 1]. However, melting and casting of niobium aluminides presents several difficulties due to the high temperatures required, high evaporation rate of aluminium and the wide difference in the melting points and...
KeywordsNiobium Intermetallic Phasis Nb3Al Zinc Stearate High Temperature Structural Material
One of the authors (I. Pong) would like to thank his parents for financial support during this work.
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