Abstract
In the present investigation, the nanocrystalline CoTi intermetallic compound was synthesized by mechanical alloying (MA) of the elemental powders. In all MA runs, the ball-to-powder weight ratio was 5:1. The phase evolution and microstructural changes of the powders during mechanical alloying were investigated by means of X-ray diffractometry, scanning electron microscopy, high-resolution transmission electron microscopy and microhardness measurements. The results showed that after an optimum mechanical alloying time of 30h, a CoTi intermetallic phase with the crystallite size of less than 10nm, the particle size of about 10μm and the lattice strain of 0.6% was achieved. The nanocrystalline CoTi intermetallic compound exhibited high microhardness value of about 480 Hv.
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