Determination of Al Site Preference in L1_2 TiZn_3 - Base Trialuminides

摘要

The atoms site preference in the Al_3Ti-Zn system has been studied using H. Rietveld method. The L1_2 Ti(Al, Zn)_3 particles evolve in a ZnAl25 melt from the L1_2 TiZn_3 particles in the ZnTi4 master alloy. It is found that Zn is replaced by Al during the transformation TiZn_3 → Ti(Al, Zn)_3. In the evolving fcc L1_2 Ti(Al, Zn)_3 phase Ti occupies (0, 0, 0) position while Al and Zn occupy (0, 0.5, 0.5) position, similarly to Al and X in the Al_3Ti-X systems, where X = Ni, Cr, Mn, Cu, Ag,Pd.