Fabrication of TiC Particulate Reinforced Ni-50Fe Super Alloy Matrix Composite Powder by Mechanical Alloying

Mechanical alloying is a powder metallurgy processing technique involving cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. In this work, NiFe-TiC composite powders were prepared by mechanical alloying process using planetary high-energy ball mill. The effect of TiC addition by weight percent on the NiFe solid solution formation, grain size, lattice parameter, internal strain and hardness of composite powders was investigated as a function of milling time, t, (in the 0-25 h range). Microstructural and phase characterizations investigationof the mechanically alloyed powders were carried out using X-ray diffractomejhghfter (XRD) and scanning electron microscope (SEM). The results showed that the brittle particles of TiC accelerate the milling process by increasing the matrix deformation and enhancing the welding and the fracture of particles. We also found that the NiFe solid solution formation occurred atearlier time of mechanical alloying with increasing the TiC content. Moreover, it was shown that with increasing theTiC by weight percent, smallercrystallite size and more hardness are obtained after mechanical alloying.