论文部分内容阅读
综合利用原子探针、透射电镜和高分辨电镜在原子尺度上研究了Fe-14B中B和FeZrB中添加元素Cu、Au和Si的分布及其对磁性的影响。主要结果有:(1)对Fe-14B,直径约为80 nm的α-Fe中B含量高达2.5 at％,这是α-Fe与非晶富B相平衡的结果;(2)加入Cu后Cu原子在α-Fe结晶以前形成Cu原子团簇,为α-Fe相提供形核位置,提高其形核密度;(3)加入Au后,在形成较多的α—Fe以后Au才形成团簇,在α-Fe长大过程中Au和Zr发生共偏聚;(4)对加Si非晶,在α-Fe的形核和长大期间,Si原子被从α-Fe中排除进入非晶相,Si的加入使α-Fe的体积分数下降,因而使磁致伸缩系数λS增加,Si含量为4at％时,λS=0。上述结果为设计高性能纳米晶软磁材料提供了科学依据。
The distribution of Cu, Au and Si added to B and FeZrB in Fe-14B and their influence on the magnetic properties were studied by atom probe, transmission electron microscopy and high resolution electron microscopy. The main results are as follows: (1) The content of B in α-Fe with a diameter of about 80 nm is as high as 2.5 at% for Fe-14B, which is the result of the balance between α-Fe and amorphous B phase; (2) Cu atoms form Cu atomic clusters before α-Fe crystallizes, providing a nucleation site for the α-Fe phase and increasing its nucleation density. (3) After adding Au, Au forms clusters after more α-Fe is formed , And Au and Zr co-segregate during the growth of α-Fe. (4) For Si-added amorphous Si atoms are excluded from α-Fe during the nucleation and growth of α-Fe, Phase and Si are added to decrease the volume fraction of α-Fe, thereby increasing the magnetostriction coefficient λS and λS = 0 when the Si content is 4 at%. The above results provide a scientific basis for designing high-performance nanocrystalline soft magnetic materials.