THE EFFECT OF STRESS ON THE MAGNETIC ALIGNMENT OF HOT-PRESSED FE-ND-BMAGNETS DERIVED BY COMPUTER-SIMULATION

The distribution of stress during hot pressing of a cast (Fe,Cu)-Nd-B magnet was simulated by SPID. The calculated stress components were co mpression stress (sigma(z)) and shear stress (tau(r,z)). The stress co mponent causing the magnetic alignment during hot pressing was sigma(z ). Tau(rz) virtually played no role in the magnetic alignment. General ly, sigma(z) was higher at the center of a specimen and decreased grad ually along the radial direction to the periphery of a specimen during hot pressing, while tau(rz) was negligible and uniformly distributed throughout the specimen. Random orientation and grain growth of phi we re evident at the outer part of a specimen where sigma(z) is very weak .