Cold-rolled texture and magnetic properties of Fe-6.2%Si sintered material

Fe-6.2%Si sintered body with an average grain size of 50 mu m has been synt hesized by a powder metallurgy method. Mixture of carbonyl iron powder and the jet-milled powder of Fe-50%Si alloy ingot was spray-dried using polyvin yl alcohol as a binder. Slabs with a thickness of 1 mm were obtained by sin tering the green compacts at 1160 degrees C for 5 h under vacuum. These sla bs were successfully cold-rolled to sheets with a thickness of 0.1 mm at ro om temperature without being annealed. The X-ray pole figures of cold-rolle d sheets with reduction rate more than 90% revealed (100) [011] texture, wh ile the recrystallized texture after annealing at 1100 degrees C was (111) [11(2) over bar]. The magnetic properties of stamped ring after annealing w ere mu(m): 10500, B-8: 1.25 T, B-r: 1.11 T, H-c: 30 A/m, respectively. The extreme ductility of 1 mm thick slabs may be due to both reduced grain size of the sintered body and the adequate balance between pressure stress and tensile stress during cold-rolling.