Abstract
0-10 vol% TiN added Mg composite powders were fabricated by mechanical alloying. The effects of the hot extrusion temperature and the TiN content on the mechanical properties of the hot extruded Mg composite were investigated. The morphology of the mechanical alloyed composite powders was studied by secondary electron images of the scanning electron microscopy. The phase formation of the mechanical alloyed composite powders and the hot extruded composite was investigated by the Cu Kα X-ray diffraction. The microstructure of the hot extruded composite was studied by the optical microscope and mechanical properties of the composites were evaluated by the density, Vickers hardness and the tensile strength. As a result, the 10 vol% TiN added Mg composite hot extruded at 773 K showed the hardness of HV(1) being 127 while the maximum tensile strength of 463 MPa was obtained for the 5 vol% TiN added Mg composite due to the grain size refinement and the dispersion-strengthening by TiN. Further increase of TiN might reduce the Mg grain bonding strength, resulting in the decrease of the tensile strength at 10 vol% TiN addition. These values are higher than those of commercial Mg alloys so that the new Mg composites are promising Mg materials for practical applications in near future.
