Sintering Property of TiC/W Nanocomposite Powders Prepared by Mechanical Alloying

W-10%TiC composite powders were prepared by ball milling.Powder properties and structures of sintered samples were analyzed.The results show that Ni and Fe are induced into powders and large number of defects are formed.The powders have a higher sintering activity after ball milling.All these improve sintering densification of powders.Ni and Fe form (Ni,Fe,W) solid solution during mechanical milling.The grain size of powders decrease gradually,and the lattice distortion increase with increasing milling time.In the microstructure tungsten grains presente a sphere-like shape and have a size of 20-30 μm and TiC particles keep their original size of 1-2 μm and distributed at the tungsten grain boundaries,and there is no obvious hole or interstice in the sintering structure.(Ni,Fe,W) phase surrounded tungsten grains as a reticulation and its volume increase with increasing ball milling time.