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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2010

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The study of properties TiAl-Nb alloys

Juřica J., Losertová M., Petlák D.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2010

z. 97

8-8

Subject of this work is an intermetallic alloy based on TiAl and doped with Nb with high creep resistance and good mechanical properties. The experimental Ti-Al-Nb material with two compositions of Ti-45Al-10Nb and Ti-40Al-15Nb was prepared from master alloy TiNb (55/45 wt. %) and Al pieces by plasma melting, vacuum induction remelting and casting into the rod shape. The samples were homogenisation annealed at 1100°C for 12 hours in Ar atmosphere and water quenched from 700°C. Heat treatment at 700 °C for 8 hours in Ar atmosphere as well as in hydrogen flowing gas was realised to prepare experimental material for hydrogen effect study. Microstructure of the specimens was studied by light and scanning electron microscopies, microhardness measurement and phase microanalysis were performed. The lamellar microstructure of the samples in as-cast and heat treated conditions formed of the ? (45 at.% Al) and ?2 (41 at.% Al) phases resulted from metallographic observation and EDS phase analysis. Microhardness values of the samples decreased after annealing and quenching. Effect of hydrogen on lamellar microstructure and microhardness values was studied on the hydrogen-charged and hydrogen-free specimens. X-ray diffraction analyses were performed on Ti-Al-Nb specimens.