Effects of heat treatment on the structure and magnetic properties of Al-Ge added Fe 73.5 − x Si 13.5 B 9 Nb 3 Cu alloys
Effects of heat treatment on the structure and magnetic properties of Al-Ge added Fe 73.5 − x Si 13.5 B 9 Nb 3 Cu alloys
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DOI：
10.1103/physrevb.76.024434
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发表时间：
2007-07
影响因子：
3.7
通讯作者：
F. Shahri;A. Beitollahi;S. Shabestari;Saeed Kamali
中科院分区：
文献类型：
--
作者：
F. Shahri;A. Beitollahi;S. Shabestari;Saeed Kamali
在这部作品中，研究了$\mathrm{Al}(1.5\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%)∕\mathrm{Ge}(1\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%)$共添加和热处理温度对快淬纯合金结构和磁性能的影响。采用单辊熔体旋压法制备了Fe}}_{73.5\ensuremath{-}x}{\mathrm{Si}}_{13.5}{\mathrm{B}}_{9}{\mathrm{Nb}}_{3}\mathrm{Cu}$(FINEMET)合金。用X射线衍射仪、X射线衍射仪、X射线衍射仪等技术研究了两个系列的铸态和热处理后的合金：400、480、560、640和$730\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$在真空$({10}^{\ensuremath{-}6}\phantom{\rule{0.3em}{0ex}}\text{Torr})$，中的真空度。透射电子显微镜、差示扫描量热仪、穆斯堡尔谱和H环示踪剂。对两个系列在$560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$热处理的合金进行的穆斯堡尔分析表明，存在两个相，与$\mathm{Al}/\mathm{Ge}$添加$(22.5\phantom{\Rule{0.3em}{0ex}}\mathm{T})$相比，具有$D{0}_{3}$结构的${\mathm{Si}$相和具有还原超精细场$(16.9\phantom{\Rule{0.3em}{0ex}}\mathm{T})$的残余非晶相增加了$(22.5\phantom{\Rule{0.3em}{0ex}}\mathm{T23.4\幻影{\规则{0.3em}{0ex}}$合金，这与X射线衍射仪和透射电子显微镜的结果非常一致。在$560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$.热处理时，这两个系列的合金都获得了最高的磁导率、饱和磁化强度和最低的矫直力然而，经$560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$)处理的{Al}/{Ge}替代合金的矫顽力低于纯FINEMET合金。这是由于Al原子取代了Fe原子，我们的X射线衍射和M ossbauer结果证实了这一点。此外，与纯$(322\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$合金相比，添加{Al}/{Ge}合金的$(317\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$，具有更高的铁磁非晶相居里温度这被认为主要与非晶态基质中Ge原子的存在有关。此外，两个系列合金的应力消除和纳米晶化的建立导致了较高的共线磁矩角。然而，当热处理温度高于$560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$，时，我们的X射线衍射、透射电子显微镜和穆斯堡尔谱结果证实了Fe-B硬磁相的形成，但情况并非如此。最后，对所研究的各种样品的结构-磁性关系进行了讨论。
In this work, we have studied the effects of the coaddition of $\mathrm{Al}(1.5\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%)∕\mathrm{Ge}(1\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%)$ and heat-treatment temperature on the structure and magnetic properties of rapidly quenched pure ${\mathrm{Fe}}_{73.5\ensuremath{-}x}{\mathrm{Si}}_{13.5}{\mathrm{B}}_{9}{\mathrm{Nb}}_{3}\mathrm{Cu}$ (FINEMET) alloys prepared by the single roller melt spinning process. Two series of as-spun and heat-treated alloys, 400, 480, 560, 640, and $730\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ for $1\phantom{\rule{0.3em}{0ex}}\mathrm{h}$ in vacuum $({10}^{\ensuremath{-}6}\phantom{\rule{0.3em}{0ex}}\text{Torr})$, were studied using various techniques such as x-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), M\"ossbauer spectroscopy, and $B\text{\ensuremath{-}}H$ loop tracer. M\"ossbauer analysis carried out on both series of alloys heat treated at $560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ revealed the presence of two phases, ${\mathrm{Fe}}_{3}\mathrm{Si}$ phase with $D{0}_{3}$ structure and a residual amorphous phase with reduced hyperfine field $(16.9\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ compared to those of $\mathrm{Al}∕\mathrm{Ge}$ added $(22.5\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ and pure FINEMET $(\ensuremath{\sim}23.4\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ alloys, in close agreement with XRD and TEM results. The highest maximum permeability, saturation magnetization, and the lowest coercivity were obtained for both series of alloys when heat treated at $560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$. However, the magnitude of coercivity was lower for the $\mathrm{Al}∕\mathrm{Ge}$ substituted alloy (heat treated at $560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$) compared to that of the pure FINEMET alloy. This is due to the substitution of Al atoms for Fe as confirmed by our XRD and M\"ossbauer results. Further, a higher ferromagnetic amorphous phase Curie temperature $({T}_{C,\mathrm{am}})$ was detected for the $\mathrm{Al}∕\mathrm{Ge}$ added alloy $(322\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$ compared to that of the pure FINEMET alloy $(317\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$, which is believed to be mainly related to the presence of Ge atoms in the amorphous matrix. Furthermore, the removal of stress and the setup of nanocrystallization for both series of alloys gave rise to a higher collinear magnetic moment angle. However, this was not the case for the samples heat treated at temperatures above $560\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$, for which the formation of the Fe-B hard magnetic phase was confirmed by our XRD, TEM, and M\"ossbauer results. Finally, the structural-magnetic properties relationship is discussed for various samples studied in this work.