通过微观分析研究添加B对LaFe_(11.5)Si_(1.5)快淬带中α-Fe杂相的影响,并探讨LaFe_(11.5)Si_(1.5)B_x (x=0.5,0.7,1.0)化合物的磁相变和磁热效应.与LaFe_(11.5)Si_(1.5)比较, 加入B后快淬薄带的显微组织显著细化, 在较高B含量的快淬薄带中还得到了非晶态结构.经1000 ℃回火2～10 h后,快淬试样均结晶为立方NaZn_(13)型的La(Fe,Si)_(13)化合物结构.含B快淬薄带经过较短时间的热处理就能得到单相结构,而且残留的α-Fe含量显著降低.磁性能测试表明,随着B含量的增大,LaFe_(11.5)Si_(1.5)B_x (x=0.5,0.7,1.0)化合物的居里温度略有升高;当B含量较低时,化合物具有一级磁相变特征并表现出与LaFe_(11.5)Si_(1.5)化合物相同的巨大磁热效应.
The influences of boron addition on secondary phase α-Fe in LaFe_(11.5)Si_(1.5) melt-spun ribbons were investigated by SEM, TEM and XRD. The magnetic transition and magnetocaloric effect of LaFe_(11.5)Si_(1.5)B_x compound (x = 0.5, 0.7, and 1.0) were discussed. Compared with LaFe_(11.5)Si_(1.5), 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 NaZn_(13)-type after annealing at 1000 ℃ 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 LaFe_(11.5)Si_(1.5)B_x compound (x = 0.5, 0.7, and 1.0) increased slightly with B content increasing; the LaFe_(11.5)Si_(1.5)B_(0.5), i.e. low-B-content compound, exhibited first-order magnetic transition characteristics and had the same giant magnetocaloric effect with LaFe_(11.5)Si_(1.5).
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