master alloys were prepared by arc melting the pure elements under Ar atmosphere Each ingot was re-melted several times in order to obtain a good homogeneity Rapid solidified ribbons (about 40 um thick) were obtained by planar flow casting using a wheel speed of 15 m/s in Ar atmosphere in the case of alloy A thinner ribbons (about 20-25 um thick) were obtained by spinning using a wheel speed of 30 m/s in Ar atmosphere