A comparative thermomagnetic study of melt-spun Nd-Fe-B alloys with different Nd content
SCIENCE OF SINTERING(2009)
摘要
Changes in the phase composition and magnetic properties of three types of commercial Nd-Fe-B alloys with different Nd content - low (10-12 wt%), near stoichiometric (21-25 wt%) and rich (26-29 wt%) caused by thermomagnetic analysis (TM) were observed in regard to optimal magnetic state. Phase compositions of investigated alloys before and after TM measurement up to 800 degrees C were compared using Fe-57 Mossbauer spectroscopy and X-Ray analysis. The TM measurements decompose all three materials and the main products of decomposition process alpha-Fe and Fe2B phase. Observed changes in structure and phase composition had direct influence on magnetic properties. Loss of magnetic properties induced by thermal decomposition is clearly illustrated on corresponding SQUID hysteresis loops.
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关键词
Nd-Fe-B alloys,Thermomagnetic measurements,Phase composition,Structure,Magnetic properties
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