Formation of Amorphous and Nanocrystalline Ti-Cu-Ni Alloys by Mechanical Alloying

Abstract

Amorphous and nanocrystalline powders of Ti_xCu_90-xNi₁₀ (x=20, 30, 40, 50 and 60 at.%) have been synthesized by the mechanical alloying method under argon atmosphere. The mechanically alloyed powders show halo patterns in the X-ray diffraction patterns for 30 ?? × ?? 60 and disordered fcc structures, with nanocrystalline grains for x=20. In the amorphous powders, the peak position of 2θ shifts to the low angle side almost linearly with increasing x. In particular, the amorphous phase is earlier formed with increasing x from 20 to 50. In the differential scanning calorimetry experiment, crystallization temperature and peak temperature increase linearly for 30 ?? ×<60. The average particle size estimated by scanning electron microscopy is about 11 gm for 30 ?? × ?? 60.