Cast Ni3Al/TiC composite - structure and strength properties
Edward Fraś*, Andrzej Janas*, Paweł Kurtyka**, Stanisław Wierzbiński** *Akademia Górniczo-Hutnicza, Wydział Odlewnictwa, ul. Reymonta 23, 30-059 Kraków **Akademia Pedagogiczna, Instytut Techniki, ul. Podchorążych 2, 30-084 Kraków
Annals 3 No. 6, 2003 pages 136-141
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abstract The study presents the results of investigation concerning the development of a method of in situ synthesis of Ni3Al/TiC composite and the strength properties examined in compression and tensile tests at ambient and high temperatures. An OWPExomelt cost-saving melting process, using an exothermal reaction between aluminium and nickel, was optimised for Ni3Albased alloys. It has been proved that OWP enables the synthesis of composite materials based on an intermetallic Ni3Al compound. The research covered Ni3Al phase-based alloys, containing boron in an amount of 0.05% by weight. Using a SHSB technique, titanium carbides in the amount of 5 wt.% were produced in the boron-treated base material. Microstructural and X-Ray examinations were carried out on the fabricated Ni3Al/TiC composite. The strength properties of the Ni3Al base material were compared with the strength properties of composite. The investigation has proved that the intermetallic, boron-containing phase of Ni3Al can be transformed into in situ composite characterised by good strength properties at ambient and high temperatures, preserving additionally satisfactory plastic properties. The composite can be a valuable material for constructions for high temperature applications. Key words: in situ composite, titanium carbide, intermetallic phase, exothermic reaction, SHSB process