GRAIN-SIZE DEPENDENCE OF COCIVITY OF NANOCOMPOSITE PERMANENT MAGNETS IN THREE PHASE-DISTRIBUTION MODELS

Acta Metall Sin

2008, Vol. 44

Issue (1): 8-12 DOI:

Research Articles

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GRAIN-SIZE DEPENDENCE OF COCIVITY OF NANOCOMPOSITE PERMANENT MAGNETS IN THREE PHASE-DISTRIBUTION MODELS

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钢铁研究总院

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. GRAIN-SIZE DEPENDENCE OF COCIVITY OF NANOCOMPOSITE PERMANENT MAGNETS IN THREE PHASE-DISTRIBUTION MODELS. Acta Metall Sin, 2008, 44(1): 8-12 .

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Abstract Phase distribution and grain size are the key factors controlling the coercivity of nanocomposite permanent magnets. Assuming three simple physical models, we have calculated the dependence of coercivity on the grain size, phase distribution and volume fraction of two phases. The calculation results show that the different phase distributions lead to the variation of grain-interface fractions, and then make the intergrain exchange-coupling fluctuate randomly. Phase distribution influences the values of coeicivity of nanocomposites, but does not change the variation tendency of coercivity on hard grain size. High coercivity can be probably obtained by designing an ideal phase distribution and controlling the grain sizes.

Key words: phase distribution grain interface grain size

Received: 17 May 2007

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