Abstract
In this study, Al-Al3Ni nanocomposite was fabricated by friction stir processing (FSP) of a nickel-deposited Al6061-T6 plate. X-ray diffraction results showed that Al3Ni phase was formed because of an in situ reaction between the preplaced nickel and aluminum substrate. To predict the first phase formed during FSP, effective heat of formation (EHF) thermodynamic model was applied, and the results were in agreement with experimental data. The presence of facet nanoparticles in transmission electron microscopy micrographs of the stir zone (SZ) confirmed the formation of Al3Ni nano-reinforcements. Although microhardness and ultimate tensile strength in the SZ of nanocomposite degraded because of precipitates dissolution in Al6061-T6 during FSP, it showed improved tribological behavior at elevated temperatures.
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