Hot Deformation Behavior, Dislocation Glide and Microstructural Evolution of Soft-Magnetic Fe-6.9Si-0.03Y Alloy

The hot deformation behavior of soft-magnetic Fe-6.9Si-0.03Y alloy was investigated by means of compression tests at temperatures between 480 and 660 °C to study the effects of deformation temperature on microstructural evolution, dislocation glide and mechanical properties. The dynamic recrystallization and the lower ordering degree were the main reasons for strain softening, eliminating the behavior of work hardening. The dynamic recrystallization decreased the density and configuration of dislocations and became obvious with increasing deformation temperatures. Meanwhile, increasing the deformation temperature promoted an increase on B2-APD size and the reduction in APB energy, and the content of DO 3 ordered phases with high-brittle-hardness characteristic gradually reduced. The DO 3 →B2 transition decreased the ordering degree of alloy and enhanced the mobility and rearrangement of dislocations, leading to an improvement of plastic deformation.