BASIC STUDY FOR PLASTIC-DEFORMATION OF RAPIDLY QUENCHED ND-FE-CO-GA-B MAGNETS AT ELEVATED-TEMPERATURE

In order to optimize hot working conditions of rapidly quenched Nd-Fe-Co-Ga-B magnets. the behaviour of plastic deformation at elevated temperatures has been studied Compressive and tensile tests were performed with various hot working parameters. Computer simulation of the die upsetting process was performed by rigid Plastic FEM calculation It was found that, to supress the occurrence of peripheral cracks and improve magnetic properties, low strain rates are necessary. Computer calculation of the distribution of stress can explain the mechanism of peripheral crack initiation in the die upsetting process. © 1990 IEEE