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NiAl-xTiC nanostructured composite powders [x50, 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.

This study aims to prepare optimal feedstock for fabrication of Al/SiC nanocomposites by the low-pressure injection molding technique. For this purpose, micronsized aluminum and nanosized SiC powders were mixed with different amounts of the binder consisting of 89 wt% paraffin wax, 9 wt% bees wax, and 2 wt% stearic acid. Rheometry analyses as well as the Weir model were utilized to determine the optimal feedstock with the desired rheological properties and high homogeneity. Considering powder to binder ratios, shear sensitivity, flow activation energy, and homogeneity within the rheometry analyses, the feedstock of 78 wt% powder loading is selected as the optimal sample for injection molding. Investigation of optimal feedstock by the scanning electron microscopy technique also verified the high homogeneity of this feedstock. In addition, it was observed that all of the feedstocks had thixotrop behavior.

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