Background: Fe-Ga alloy is a new magnetostrictive material of lower price and better extensibility in comparison with conventional Tb-Dy-Fe alloys.Many researches revealed that the microstructure and magnetostriction are influenced by preparing method and heat treatment.Purpose: In order to study the influence of microstructure on magnetostrctive properties of Fe-Ga alloy

the phase structures

local structure and magnetostrictive properties of Fe85Ga15 ribbons prepared by different wheel speed was studied.Methods: We utilized high resolution x-ray diffraction（HRXRD） to characterize the phase structure and used Extend X-ray absorption fine structure（EXAFS） to study the local structure of the ribbons in Synchrotron Radiation Facility.Results: X-ray diffraction showed that only disordered BCC phase was observed in as-cast Fe85Ga15alloy.Modified-DO3phase were detected in all of the melt spun samples.Both the HRXRD and EXAFS results indicated that Ga atoms were located as second-nearest neighbour along [100] orientation.A little DO3 phase was found in ribbons annealed at 1000℃ under Ar atmosphere.Conclusions: Higher wheel speed will generate more modified-DO3 phase which will enhance the magnetostriction.DO3phase in the annealing sample will deteriorate the magnetostrictive properties of Fe-Ga ribbons.