The effect of stress on the magnetic alignment of hot-pressed Fe-Nd-B magnets derived by computer simulation

The distribution of stress during hot pressing of a cast (Fe, Cu)-Nd-B magnet is simulated by simple plastic increment deformation (SPID). The calculated stress components are compression stress (σ _z) and shear stress (τ_rz). The stress component causing the magnetic alignment during hot pressing, σ _z, τ_rz, virtually plays no role in the magnetic alignment. Generally, σ_z is higher at the center of a specimen and decreases gradually along the radial direction to the periphery of a specimen during hot pressing, while τ_rz is negligible and uniformly distributed throughput the specimen. Random orientation and grain growth of φ are evident at the outer part of a specimen where σ_z is very weak