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Application of Transmission Electron Microscopy in Investigations of Structural Anisotropy of NdFeB Magnets

Derewnicka D.

Advances in Materials Science

2008

Vol. 8, nr 3(17)

4-10

Rapid quenched powdered ribbons Nd13.6Co6.6Ga0.6B5.5Fe73.7 (at. %) were hot pressed at 700o C. Next, the alloys were subjected to die-upset process through heating to 600, 750 and 1000o C and forged at a rate of 1x10-3 s-1 to the stage of deformation equal to �A = 60%. Directional grain growth occurs in the material during this treatment, which is beneficial due to the anisotropic magnetic properties obtained in such materials. Detailed analysis performed using transmission electron microscopy shows the tendency of micro structural changes in the magnet resulting from the application of different temperatures of the processes.