Structure analysis of CoFeBSiNb(Ga) pseudobulk metallic glasses

► CoFeBSiNb ribbons and trilayers were prepared by modified planar flow casting. ► Samples were annealed up to 1100 K, Fe2B and (Co-Fe)23B6 were determined by XRD. ► Increased thickness has no influence on final microstructure. ► Ga addition into base composition slightly changes microstructure at 1100 K. ► Ga affects the kinetics of crystallization and new phase was observed α(Fe-Co).