Characterization of TiB۲ reinforced aluminum matrix composite synthesized by in situ stir casting method

In this study, TiB۲ reinforced Al-matrix composite was fabricated by in situ stir casting route, and the effect of processing parameters was investigated. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) equipped with energy-dispersive X-ray spectroscopy (EDX) were used to study the composition and microstructure of the samples. Finally, to investigate the tribological and electrochemical behavior of the samples, wear tests (pin-on-disk) and potentiodynamic polarization tests (PDP) were used, respectively. Results showed that by increasing stirring time, both tribological and mechanical behavior of the samples improved. Also, it was found that by increasing the stirring speed of the melt to ۱۸۰ rpm, the mechanical and tribological behavior of the samples improved, and by further increasing the stirring speed to ۳۰۰ rpm, they were decreased. Consequently, samples containing lower than ۷ wt. % TiB۲ showed better metallurgical properties, due to lack of agglomeration.

کلیدواژه ها:

In situ ، Composite ، TiB۲ ، Wear resistance ، Stir casting