Nanoscale precipitates and phase transformations in a rapidly-solidified Fe-Pt-B amorphous alloy
Nanoscale precipitates and phase transformations in a rapidly-solidified Fe-Pt-B amorphous alloy
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DOI：
10.1016/j.jallcom.2005.03.089
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发表时间：
2005-10-27
影响因子：
6.2
通讯作者：
Inoue, A
中科院分区：
文献类型：
--
作者：
Louzguine-Luzgin, DV;Zhang, W;Inoue, A
用X射线衍射仪、差示扫描量热仪和等温量热仪研究了快速凝固(Fe0.75Pt0.25)(75)B-25合金在加热过程中的相变。用透射电子显微镜观察了铸态组织。包括纳米束衍射和高分辨成像在内的透射电子显微镜结果清楚地表明，在凝固的非晶基质中存在纳米级立方的CF4Fe(Pt)固溶体颗粒。CF4Fe(Pt)相的颗粒在高温下开始生长，并经历有序化形成tP4FePT化合物，然后从残留的非晶基质中析出TI12Fe2B相。立方相的有序化发生在孕育期之后，这允许预期成核和生长机制。这一过程之后是粒子的进一步生长。详细研究了加热过程中的相变行为。(C)2005 Elsevier B.V.保留所有权利。
The phase transformations in a rapidly solidified (Fe0.75Pt0.25)(75)B-25 alloy on heating were studied by X-ray diffractometry, differential scanning and isothermal calorimetries. An as-solidified structure was examined by transmission electron microscopy (TEM). The results of TEM, including nano-beam diffraction and high-resolution imaging, clearly indicate the existence of nano-scale cubic cF4 Fe(Pt) solid solution particles within the as-solidified amorphous matrix. The particles of the cF4 Fe(Pt) phase start growing at elevated temperature and undergo ordering forming a tP4 FePt compound followed by the precipitation of a tI12 Fe2B phase from the residual amorphous matrix. The ordering of the cubic phase takes place after an incubation period which allows to anticipate a nucleation and growth mechanism. This process is followed by further growth of the particles. The transformation behavior on heating is studied in detail. (c) 2005 Elsevier B.V. All rights reserved.