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添加B對LaFe11.5Si1.5快淬帶殘余α-Fe相以及磁熱效應(yīng)的影響
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Influences of Boron Addition on Residual α-Fe Phase and Magnetocaloric Effect of LaFe11.5Si1.5 Melt-Spun Ribbons
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    摘要:

    通過微觀分析研究添加B對LaFe11.5Si1.5快淬帶中α-Fe雜相的影響，并探討LaFe11.5Si1.5Bx (x=0.5，0.7，1.0)化合物的磁相變和磁熱效應(yīng)。與LaFe11.5Si1.5比較， 加入B后快淬薄帶的顯微組織顯著細(xì)化, 在較高B含量的快淬薄帶中還得到了非晶態(tài)結(jié)構(gòu)。經(jīng)1000 ℃回火2~10 h后，快淬試樣均結(jié)晶為立方NaZn13型的La(Fe,Si)13化合物結(jié)構(gòu)。含B快淬薄帶經(jīng)過較短時間的熱處理就能得到單相結(jié)構(gòu)，而且殘留的α-Fe含量顯著降低。磁性能測試表明，隨著B含量的增大，LaFe11.5Si1.5Bx (x=0.5,0.7,1.0)化合物的居里溫度略有升高；當(dāng)B含量較低時，化合物具有一級磁相變特征并表現(xiàn)出與LaFe11.5Si1.5化合物相同的巨大磁熱效應(yīng)。

    Abstract:

    The influences of boron addition on secondary phase α-Fe in LaFe11.5Si1.5 melt-spun ribbons were investigated by SEM, TEM and XRD. The magnetic transition and magnetocaloric effect of LaFe11.5Si1.5Bx compound (x = 0.5, 0.7, and 1.0) were discussed. Compared with LaFe11.5Si1.5, the melt-spun ribbons have much finer microstructure after B addition, and even amorphous structure is obtained when B content is higher. The melt-spun specimens were crystallized into La(Fe,Si)13 compound structure of cubic NaZn13-type after annealing at 1000 °C for 2-10 h. The annealing time can be reduced after B atom introduction to get single phase structure and the amount of residual α-Fe is decreased significantly. Magnetic property test show that Curie temperature of the LaFe11.5Si1.5Bx compound (x = 0.5, 0.7, and 1.0) increased slightly with B content increasing; the LaFe11.5Si1.5B0.5, i.e. low-B-content compound, exhibited first-order magnetic transition characteristics and had the same giant magnetocaloric effect with LaFe11.5Si1.5.

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謝 鯤,劉立強,余麗艷,宋曉平.添加B對LaFe11.5Si1.5快淬帶殘余α-Fe相以及磁熱效應(yīng)的影響[J].稀有金屬材料與工程,2009,38(12):2238~2241.[Xie Kun, Liu Liqiang, Yu Liyan, Song Xiaoping. Influences of Boron Addition on Residual α-Fe Phase and Magnetocaloric Effect of LaFe11.5Si1.5 Melt-Spun Ribbons[J]. Rare Metal Materials and Engineering,2009,38(12):2238~2241.]
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  • 收稿日期:2008-11-29
  • 最后修改日期:2009-07-23
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