STR/03/001/FT Development of Nanocrystalline Ti-Si and Ni-Ti Alloys for Biomedical Application

Abstract

Abstract – Mechanical alloying of Ti-Si and Ni-Ti was performed by high-energy ball milling at ambient temperature. The structural and compositional evolutions during mechanical alloying were investigated. Results showed that the crystallite size of mechanically alloyed Ti-Si and Ni-Ti powders decreased with increasing milling time and the steady-state crystallite size was approximately 10 nm. The mechanically alloyed Ti-Si and Ni-Ti powders were predominantly nanocrystalline with traces of the remnant amorphous phase. It was found that a significant increase in solid solubility of Si (or Ni) in Ti was achieved by mechanical alloying. The optimum milling time for the synthesis of nanocrystalline/amorphous Ti-Si and Ni-Ti with least impurities was 75 h. Keywords: Ni-Ti, Ti-Si, Mechanical alloying