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| STUDY OF MECHANISM OF RQ EMBRITTLEMENT OF Fe_(73.5)Cu_1-Nb_3Si_(13.5)B_9 NANOCRYSTALLINE SOFT MAGNETIC ALLOY | |
| 作者姓名： | X.G.Cao J.L.Huang E.Sukedai Y.G.Wang W.Z.Chen and S.X.Zhou Henan University of Science and Technology Luoyang China Okayama University of Science Okayama Japan Beijing Laboratory of Electron Microscope The Chinese Academy of Sciences Beij |
| 作者单位： | X.G.Cao，J.L.Huang，E.Sukedai，Y.G.Wang，W.Z.Chen and S.X.Zhou Henan University of Science and Technology，Luoyang 471003，China Okayama University of Science，Okayama 700，Japan Beijing Laboratory of Electron Microscope，The Chinese Academy of Sciences，Beij |
| 基金项目： | This work was supported by Chinese National Engineering Technology Research Center on Amorphous and Microcrystalline Alloys. |
| 摘 要： | Rapidly quenching embrittlement (RQE) sometimes appears in Fe73.5Cu1Nb3Si13.5B9 nanocrystalline soft magnetic alloy (FINEMET) during production process. As a re-sult of RQE the ductility of the as-quenched ribbon drops seriously. The mechanism of RQE has been elucidated in the recent works of current authors. It was believed that RQE is due to the structural relaxation but not related to a-Fe(Si) crystallization. In this paper, the high resolution TEM (HRTEM) method and image digital processing were applied to analyze the HRTEM images of two FINEMET rapidly quenched ribbons with different thicknesses in detail. In the thinner ductile sample, the ordering domains with the size of about 3nm are observed. In the thicker RQE sample, the metastable nanocrystalline domains with the size of 18nm are observed along with the structural relaxation. These domains seem to have Fe3B-like metastable phase struc-ture on nanometer scale. The result indicates that the local atomic ordering regions extend when RQE induced |
| 收稿时间： | 2001-11-19 |
| 修稿时间： | 2002-04-24 |
STUDY OF MECHANISM OF RQ EMBRITTLEMENT OF Fe73.5Cu1 Nb3Si13.5B9 NANOCRYSTALLINE SOFT MAGNETIC ALLOY |
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| X.G.Cao,J.L.Huang,E.Sukedai,Y.G.Wang,W.Z.Chen and S.X.Zhou Henan University of Science and Technology,Luoyang ,China Okayama University of Science,Okayama ,Japan Beijing Laboratory of Electron Microscope,The Chinese Academy of Sciences,Beij.STUDY OF MECHANISM OF RQ EMBRITTLEMENT OF Fe_(73.5)Cu_1-Nb_3Si_(13.5)B_9 NANOCRYSTALLINE SOFT MAGNETIC ALLOY[J].Acta Metallurgica Sinica(English Letters),2002,15(4):363-368. | |
| Authors: | XGCao JLHuang ESukedai YGWang WZChen SXZhou |
| Affiliation: | 1. Henan University of Science and Technology, Luoyang 471003, China 2. Okayama University of Science, Okayama 700, Japan 3. Beijing Laboratory of Electron Microscope, The Chinese Academy of Sciences, Beijing 100080, China 4. National Engineering Technology Research Center on Amorphous & Microcrystalline Alloys, Beijing100081, China |
| Abstract: | Rapidly quenching embrittlement (RQE) sometimes appears in Fe73.5 Cu1 Nb3Si13.5B9nanocrystalline soft magnetic alloy (FINEMET) during production process. As a re-sult of RQE the ductility of the as-quenched ribbon drops seriously. The mechanism ofRQE has been elucidated in the recent works of current authors. It was believed thatRQE is due to the structural relaxation but not related to α-Fe(Si) crystallization. Inthis paper, the high resolution TEM (HRTEM) method and image digital processingwere applied to analyze the HRTEM images of two FINEMET rapidly quenched rib-bons with different thicknesses in detail. In the thinner ductile sample, the orderingdomains with the size of about 3nm are observed. In the thicker RQE sample, themetastable nanocrystalline domains with the size are 18nm are observed along with thestructural relaxation. These domains seem to have Fe3B-like metastable phase struc-ture on nanometer scale. The result indicates that the local atomic ordering regionsextend when RQE induced by structural relaxation occurs. |
| Keywords: | HRTEM FINEMET rapidly quenching embrittlement mecha-nism |
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