Effects of reinforcement content and sequential milling on the microstructural and mechanical properties of TiB2 particulate-reinforced eutectic Al-12.6 wt% Si composites

摘要: This study reports the effects of reinforcement content (2, 5 and 10 wt%) sequential milling on microstructural, physical mechanical properties TiB2 particulate-reinforced Al-12.6 wt% Si metal matrix composites (MMCs) prepared starting from Al, elemental powders. Sequential process included two different kinds high-energy ball such as alloying (MA) cryomilling (CM). MA experiments were carried out at room temperature for 4 h using a Spex™ 8000D Mixer/Mill. Subsequent CM conducted with externally circulated liquid N 2 10, 20 30 min 6870 Freezer/Mill. Milled powders compacted by cold uniaxial pressing under pressure 450 MPa then isostatic (CIP) 400 MPa. The green bodies sintered 570 °C Ar atmosphere. Characterization investigations samples performed X-ray diffractometer (XRD), TOPAS software, scanning electron microscope/energy-dispersive spectrometer (SEM/EDS) particle size analyzer (PSA). Sintered also characterized in terms Archimedes density, Vickers microhardness relative wear resistance. Composites mechanically alloyed (MA’d) cryomilled (CM’d) exhibited higher values than those other samples. Wear rates slightly increased increasing time. At constant time min, incredibly decreased increased.