BOUNDARY MICROSTRUCTURE AND MAGNETIC HARDENING OF SINTERED NdFeB MAGNET

Abstract

Abstract: The boundary microstructure of sintered alloy Nd_(15.5)Fe_(77)B_-(7.5) has been studied by TEM,AES and SAED.The boundary structure may be distinguished into 4 types.The first three types remain the same during annealing,and the fourth changes its microstructure remarkably.The 4th type is composed of two different regions,i.e.,the central Nd-rich phase and the epitaxial laver of the Nd_2Fe_(14)B grains.Owing to the atomic diffusion and other types of mass trans- port,magnetic hardening occurred in the epitaxial layer,thus the coercivity of the alloy has been improved.

Key words: NdFeB magnet, microstructure, coercivity

ZHOU Shouzeng TANG Weizhong WANG Run University of Science and Technology Beijing,Beijing,China. BOUNDARY MICROSTRUCTURE AND MAGNETIC HARDENING OF SINTERED NdFeB MAGNET[J]. Acta Metallurgica Sinica (English Letters), 1991, 4(7): 59-63.

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BOUNDARY MICROSTRUCTURE AND MAGNETIC HARDENING OF SINTERED NdFeB MAGNET

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