Abstract Two types of Gaussian function for describing the grain a lignment in NdFeB permanent magnetic materials are introduced and compared in this paper. The results show that when the degree of grain alignment is avorable, the theoretical results based on the “$\theta$-type” Gaussian function are in a greement with those based on the “tan $\theta$-type”Gaussian function in the var iation tendency of the distribution coefficients and the distribution curves. When the degree of grain alignment is not good, the two descriptions have a large difference from each other. The theoretical results based on the “tan $\theta$-type” Gaussian function are in good agreement with the experiments in the grain alignment dependence of the coercivity. However, the obtained results based on the “$\theta$-type”Gaussian function are not in agreement with the experiments. The“tan $\theta$-type”Gaussian function can be used to describe the grain alignment of various degrees and is consistent with the common Gaussian function taking x as a variable. So it is an optimum function for describing the grain alignment.
Received: 24 March 1997
Accepted manuscript online:
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