Observation of Cu nanometre scale clusters formed in Fe85Si2B8P4Cu1 nanocrystalline soft magnetic alloy by a spherical aberration-corrected TEM/STEM
Observation of Cu nanometre scale clusters formed in Fe85Si2B8P4Cu1 nanocrystalline soft magnetic alloy by a spherical aberration-corrected TEM/STEM
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DOI：
10.1080/09500839.2015.1052584
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发表时间：
2015-05
影响因子：
1.2
通讯作者：
M. Nishijima;M. Matsuura;Yan Zhang;A. Makino
中科院分区：
文献类型：
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作者：
M. Nishijima;M. Matsuura;Yan Zhang;A. Makino
纳米晶软磁Fe 85 Si 2B 8 P4 Cu 1合金（NANOMET®）的微结构通过现有技术的球面像差校正TEM/STEM来研究。通过TEM观察表明，在738 K下热处理600 s的NANOMET®的微观结构表现出最佳的软磁性能，其具有均匀分布的bcc-Fe纳米晶，平均晶粒尺寸为30 nm，嵌入非晶基体中。元素分布表明，磷被排斥在bcc-Fe晶粒之外，并在晶粒外富集，这导致bcc-Fe晶粒生长受阻。用超细电子探针进行的像差校正的STEM-EDS分析成功地证明了Cu原子在bcc-Fe纳米晶内部和/或外部形成纳米尺度的团簇。
Microstructure of a nanocrystalline soft magnetic Fe85Si2B8P4Cu1 alloy (NANOMET®) was investigated by the state of the art spherical aberration-corrected TEM/STEM. Observation by TEM shows that the microstructure of NANOMET® heat treated at 738 K for 600 s which exhibits the optimum soft magnetic properties has homogeneously distributed bcc-Fe nanocrystallites with the average grain size of 30 nm embedded in an amorphous matrix. Elemental mappings indicate that P is excluded from bcc-Fe grains and enriched outside the grains, which causes to retard the grain growth of bcc-Fe crystallites. The aberration-corrected STEM-EDS analysis with the ultrafine electron probe successfully proved that Cu atoms form nanometre scale clusters inside and/or outside the bcc-Fe nanocrystallites.