Production of titanium-tin alloy powder by ball milling: Formation of titanium-tin oxynitride composite powder produced by annealing in air

Phase transformation was induced by ball milling and annealing of Ti-75-Sn-25 powder. HCP solid solution was induced by Ball milling and yielded a compressed lattice parameters a = 2.929 angstrom; c = 4.780 angstrom and c/a = 1.63. Upon annealing in Ar at 700 degrees C, Ti3Sn intermetallic with lattice parameters a = 5.916 angstrom; c = 4.764 angstrom with (c/a = 0.80) was detected. Subsequent TGA analysis of HCP milled Ti-Sn and Ti3Sn intermetallic in air have resulted in tetragonal oxynitride powders with lattice parameters a = 4.985 angstrom; c = 2.962 angstrom, c/a = 0.594 for the former and a = 4.582 angstrom; c = 2.953 angstrom and c/a = 0.644 for the latter, respectively. The powder morphology was monitored by the high-resolution transmission electron microscopy while the roughness of the milled was analysed by the atomic force microscopy. Phase transformation was monitored by the X-ray diffraction and complemented by the Raman spectroscopy. (C) 2014 Elsevier B.V. All rights reserved.