The mean grain size determination of boron carbide (B4C)–aluminium (Al) and boron carbide (B4C)–nickel (Ni) composites by ultrasonic velocity technique

In this study, the mean grain size of ceramic–metal composites, made from boron carbide (B4C)–aluminium (Al)–nickel (Ni) powders, has been determined with ultrasonic velocity technique by using a 2 MHz transducer. An ultrasonic velocity–grain size master graph was plotted using a 4 MHz ultrasonic transducer. The results were compared to the mean grain size obtained from SEM (Scanning Electron Microscopy) images.