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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructural characterization and amorphous phase formation in Co_(40)Fe_(22)Ta_8B_(30) powders produced by mechanical alloying
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Microstructural characterization and amorphous phase formation in Co_(40)Fe_(22)Ta_8B_(30) powders produced by mechanical alloying

机译：机械合金化Co_（40）Fe_（22）Ta_8B_（30）粉末的微观结构表征和非晶相形成

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摘要

In this work, microstructural evolution and amorphous phase formation in Co_(40)Fe_(22)Ta_8B_(30) alloy produced by mechanical alloying (MA) of the elemental powder mixture under argon gas atmosphere was investigated. Milling time had a profound effect on the phase transformation, microstructure, morphological evolution and thermal behavior of the powders. These effects were studied by the X-ray powder diffraction (XRD) in reflection mode using Cu Ka and in transmission configuration using synchrotron radiation, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results showed that at the early stage of the milling, microstructure consisted of nanocrystalline bcc-(Fe, Co) phases and unreacted tantalum. Further milling, produced an amorphous phase, which became a dominant phase with a fraction of 96wt% after 200 h milling. The DSC profile of 200 h milled powders demonstrated a huge and broad exothermic hump due to the structural relaxation, followed by a single exothermic peak, indicating the crystallization of the amorphous phase. Further XRD studies in transmission mode by synchrotron radiation revealed thatthe crystalline products were (Co, Fe)_(20.82)Ta_(2.18)B_6, (Co, Fe)_(21)Ta_2B_6, and (Co, Fe)_3B_2. The amorphization mechanisms were discussed in terms of severe grain refinement, atomic size effect, the concept of local topological instability and the heat of mixing of the reactants.
机译：在这项工作中，研究了在氩气气氛下通过机械合金化（MA）元素粉末混合物制得的Co_（40）Fe_（22）Ta_8B_（30）合金的微观结构演变和非晶相形成。研磨时间对粉末的相变，微观结构，形貌演变和热行为具有深远的影响。通过使用Cu Ka的反射模式的X射线粉末衍射（XRD）和使用同步加速器辐射，透射电子显微镜（TEM），扫描电子显微镜（SEM）和差示扫描量热法（DSC）的透射构型研究了这些效应。结果表明，在研磨的早期，显微组织由纳米晶bcc-（Fe，Co）相和未反应的钽组成。进一步研磨产生无定形相，在研磨200小时后，非晶相变成占主导地位的相，占96wt％。由于结构松弛，200 h研磨粉末的DSC曲线显示出巨大而宽泛的放热峰，随后是一个放热峰，表明非晶相的结晶。进一步通过同步辐射在透射模式下的XRD研究表明，结晶产物为（Co，Fe）_（20.82）Ta_（2.18）B_6，（Co，Fe）_（21）Ta_2B_6和（Co，Fe）_3B_2。从严重的晶粒细化，原子尺寸效应，局部拓扑不稳定性和反应物混合热的角度讨论了非晶化机理。

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