Sharif University of Technology Scientia Iranica 1026-3098 17 1 2010 06 01 Structural and Magnetic Study of Active Screen Plasma Nitrided Fe73:5Si13:5B9Nb3Cu1 and Fe77Si11B9Nb2:4Cu0:6 Ribbons 3345 EN Elmira Memarzadeh Lotfabad Department of Materials Science and Engineering,Sharif University of Technology Hamid Reza Madaah Hosseini Department of Materials Science and Engineering,Sharif University of Technology Hossein Asghari Shivaee Department of Materials Science and Engineering,Sharif University of Technology Saied Roostaie Department of Materials Science and Engineering,Amirkabir University of Technology Journal Article 2010 11 06 The comparative study of Active Screen Plasma Nitriding (ASPN) treatment of two Finemet-type alloys with the compositions of Fe73:5Si13:5B9Nb3Cu1 and Fe77Si11B9Nb2:4Cu0:6 was investigated in dierent temperatures ranging from 410C to 560C. Dierential Scanning Calorimetry (DSC), X-Ray Diractometery (XRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), electrical resistivity, microhardness measurements and magnetic characterization by a Vibrating Sample Magnetometer (VSM) were utilized to characterize the treated samples. The comparison of the DSC data for the alloys suggested that the smaller amount of Nb as a growth inhibitor shifted the crystallization temperatures towards lower temperatures. Thus, the crystalline volume fraction and grain size in each temperature for Fe77Si11B9Nb2:4Cu0:6 alloy increased compared to Fe73:5Si13:5B9Nb3Cu1 alloy. The size of iron nitrides on the surface of the ribbons with the lower Si content was larger. The electrical resistivity for the annealed and nitrided Fe77Si11B9Nb2:4Cu0:6 alloy was lower compared to the annealed and nitrided Fe73:5Si13:5B9Nb3Cu1 alloy, due to the larger grain size and lower Si content of Fe(Si) phase in Fe77Si11B9Nb2:4Cu0:6 alloy. The VSM results showed that the maximum saturation magnetization and coercivity at 440C were obtained in Fe77Si11B9Nb2:4Cu0:6 alloy after nitriding under 75% H2 and 75% N2 gas mixture, respectively. https://scientiairanica.sharif.edu/article_3345_c59fe5aa1ec86624c9a972ad57d448e0.pdf