Abstract :
We have investigated the local atomic order of an amorphous Co57Ti43 alloy produced by mechanical alloying by means of x-ray diffraction and EXAFS analyses on Co and Ti K-edges. Average coordination numbers and average interatomic distances between first neighbors where found from EXAFS and compared with those determined using an additive hard sphere (AHS) model associated with an RDF ( r ) deconvolution, and also with data from bcc- Co2Ti compound. EXAFS results obtained indicated a shortening in the Co–Ti and Ti–Ti average interatomic distances when compared to those found by using the AHS-RDF method and an increase in the Co–Co and Ti–Ti average interatomic distances and a shortening in the Co–Ti one when compared to the interatomic distances found in the bcc- Co2Ti compound. In spite of these differences, average coordination numbers obtained from EXAFS and AHS-RDF are similar to each other and also to those found in bcc- Co2Ti.
