Microstructural evolution of nanostructured Ti0.9Al0.1N prepared by reactive ball-milling

作者：Bhaskar U K; Bid S; Pradhan S K^*

来源：Journal of Alloys and Compounds, 2011, 509(3): 620-626.

DOI：10.1016/j.jallcom.2010.09.117

• Mechanical alloying
• Rietveld
• HRTEM
• Nanocrystalline Ti0.9Al0.1N
• Microstructure

Nanocrystalline stoichiometric Ti0.9Al0.1N powder has been prepared by ball-milling the alpha-Ti (hcp) and aluminum (fcc) powders under N-2 at room temperature. Initially, alpha-Ti phase partially transformed to the transient cubic beta-Ti phase and Ti0.9Al0.1N (fcc) phase is noticed to form after 3 h of milling. Nanocrystalline stoichiometric Ti0.9Al0.1N phase is formed after 7 h of milling. After 1 h of milling, all Al atoms are diffused into the alpha-Ti matrix. The transient beta-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 Ti0.9Al0.1N phase. Microstructure of ball-milled samples is also characterized by HRTEM. The particle size of Ti0.9Al0.1N phase, as obtained from XRD method, is similar to 5 nm which is very close to that obtained from HRTEM.

• 出版日期2011-1-21