Abstract
Nanocrystalline stoichiometric Ti 0.9Al 0.1N powder has been prepared by ball-milling the α-Ti (hcp) and aluminum (fcc) powders under N 2 at room temperature. Initially, α-Ti phase partially transformed to the transient cubic β-Ti phase and Ti 0.9Al 0.1N (fcc) phase is noticed to form after 3 h of milling. Nanocrystalline stoichiometric Ti 0.9Al 0.1N phase is formed after 7 h of milling. After 1 h of milling, all Al atoms are diffused into the α-Ti matrix. The transient β-Ti phase is noticed to form after 1 h of milling and disappears completely after 7 h of milling. Microstructure characterization of unmilled and ball-milled powders by analyzing XRD patterns employing the Rietveld structure refinement reveals the inclusion of Al and nitrogen atoms into the Ti lattice on the way to formation of Ti 0.9Al 0.1N phase. Microstructure of ball-milled samples is also characterized by HRTEM. The particle size of Ti 0.9Al 0.1N phase, as obtained from XRD method, is ∼5 nm which is very close to that obtained from HRTEM.
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