Abstract
Extended X-ray absorption fine-structure (EXAFS) has been used to study the local atomic order in Ti 2 AlMo and Ti 2 AlNb in the B2 phase. It is found that the Mo and Nb atoms have different behaviors. Whereas the Ti 2 AlMo alloy is ordered as a pseudo-B2 structure in which the Mo and Al atoms are localized on one site and Ti atoms on the other, the Ti 2 AlNb alloy exhibits a more disordered behavior since the Nb and the Ti atoms are distributed on both sites. EXAFS experiments allowed us to quantify the fraction of Nb on each site in Ti 2 AlNb as well as the bond lengths in both alloys.
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