Microstructure and magnetic properties of melt-spun Sm(Co0.58Fe0.31Cu0.04Zr0.05B0.02)z ribbons
Microstructure and magnetic properties of melt-spun Sm(Co0.58Fe0.31Cu0.04Zr0.05B0.02)z ribbons
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DOI：
10.1063/1.1688446
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发表时间：
2004-05-01
影响因子：
3.2
通讯作者：
Ma, BM
中科院分区：
文献类型：
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作者：
Gopalan, R;Ping, DH;Ma, BM
利用透射电子显微镜（TEM）和三维原子探针（3dp）研究了熔融纺丝Sm(Co0.58Fe0.31Cu0.04Zr0.05B0.02)(z) （z=7.5和12）带的微观结构，并将其与硬磁性能进行了关联。z=7.5的条带具有高矫顽力((i)H(c)，类似于12 kOe)，而z=12的条带具有低矫顽力(（i)H(c)，类似于4.9 kOe）。高H-i(c)带由主相为1:7H （TbCu7）型结构的纳米晶体（类似于10 nm）组成。然而，在低H-i(c)带中，微观结构由1:7H和2:17H （Th2Ni17）相组成，晶体尺寸在50 ~ 80 nm之间。低矫顽力条带还含有（CoFeZr）（23）B-6 （M23B6型）软磁相。在z=12的熔融纺丝带中获得低矫顽力是由于：(i) Th2Ni17型低各向异性相的形成，（ii）富硼软磁相的存在，以及（iii）较大的晶体尺寸。在z=7.5的条带中实现高矫顽力是由于形成了1:7H的高各向异性相以及减小了晶粒尺寸。(C) 2004年美国物理研究所。
We have investigated the microstructures of melt-spun Sm(Co0.58Fe0.31Cu0.04Zr0.05B0.02)(z) (z=7.5 and 12) ribbons by transmission electron microscopy (TEM) and three dimensional atom probe (3DAP) to correlate them with the hard magnetic properties. The ribbon with z=7.5 has a high coercivity ((i)H(c)similar to12 kOe) while the ribbon with z=12 possesses a low coercivity ((i)H(c)similar to4.9 kOe). The high H-i(c) ribbon comprises of nanocrystals (similar to10 nm) having 1:7H (TbCu7) type structure as main phase. However, in the low H-i(c) ribbon, the microstructure consists of both 1:7H and 2:17H (Th2Ni17) phases with crystal size ranging from 50 to 80 nm. The low coercivity ribbon also contains (CoFeZr)(23)B-6 (M23B6 type) soft magnetic phase. The low coercivity obtained in the melt-spun ribbon with z=12 is due to: (i) the formation of Th2Ni17 type low anisotropy phase, (ii) the presence of boron-rich soft magnetic phase, and (iii) larger crystal size. Realization of high coercivity in the ribbon with z=7.5 is due to the formation of 1:7H, a high anisotropy phase, as well as reduced grain size. (C) 2004 American Institute of Physics.