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Abstract
NiAl–xTiC nanostructured composite powders [x = 0, 1, 3, 6 and 10 volume fraction per cent (vf%)] were produced by high energy ball milling of Ni, Al and nano-TiC powders. Sintering of prepared nanostructured NiAl powder using hot pressing resulted in an ultrafine grained NiAl intermetallic with a high relative density, while addition of TiC nanoparticles seriously inhibited grain growth and slightly decreased the relative density of nanostructured NiAl. It was found that the addition of nano-TiC reinforcement up to 10 vf% resulted in stabilisation of nanostructured NiAl in nanocomposite products.
Acknowledgements
One of the authors (M. B. Rahaei) wishes to express his cordial gratitude to Professor Jia Dechang of the Institute for Advanced Ceramics, Harbin Institute of Technology (HIT), China, for in part financial support and suitable suggestions for the completion of this research. The corresponding author also would like to thank Dr Zhao Liyou and Ms Gong Dan and Shi Jinghong for invaluable assistance in the preparation of this paper.