The constitution of the ternary system Fe-Ni-Si
The constitution of the ternary system Fe-Ni-Si
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DOI：
10.1016/j.intermet.2008.11.016
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发表时间：
2009-06-01
期刊：
影响因子：
4.4
通讯作者：
Schuster, Julius C.
中科院分区：
文献类型：
--
作者：
Ackerbauer, Sarah;Krendelsberger, Nataliya;Schuster, Julius C.
使用 X 射线衍射 (XRD)、金相 (SEM)、能量色散光谱 (SEM/EDS)、磁化率测量和差热分析 (DTA) 对三元系 Fe-Ni-Si 进行了研究。证实了三元相tau的存在，并证实其晶体结构与Cr3Ni5Si2是同构的。在 700 摄氏度时，该相的均匀性从 43 at.% 延伸至 55 at.% 铁（Si 恒定为 20 at.%）。此外，对于二元相 NiSi2、Ni2Si 和 Ni31Si12，发现对铁有广泛的溶解度，而 Fe 在 NiSi、Ni3Si2 或 Ni3Si 中的溶解度不超过 5 at.%。另一方面，FeSi 和 Fe3Si 相对 Ni 具有很大的溶解度，而在 FeSi2 中则相当有限。 （二元高温）相 Fe5Si3 通过 Ni 稳定在至少低至 700 摄氏度的温度下。 T 与基于 Fe3Si、Ni31Si12 以及 γ (Ni) 的固溶体之间存在连接线。 Fe2Si-Ni2Si 垂直截面的 DTA 测量强烈表明 Fe2Si 和 theta Ni2Si 形成了完整系列的固溶体 theta(Fe, Ni)(2)Si，因此是同构的。对 Fe2Si 可用晶体结构数据的严格评估支持了这一假设。富铁θ(Fe, Ni)(2)Si是一种弱铁磁体。 θ(Fe, Ni)(2)Si 中每个 Fe 原子的磁矩类似于 1 μB，仅为 tau Fe5Ni3Si2 测量的每个 Fe 原子磁矩的一半。建立了考虑整个系统所有 DTA 数据的反应方案，并结合第一结晶相的观察结果修正了 Fe-Ni-Si 的液相线表面。 (C) 2008 Elsevier Ltd. 保留所有权利。
The ternary system Fe-Ni-Si was investigated using X-ray diffraction (XRD), metallography (SEM), energy dispersive spectroscopy (SEM/EDS), magnetic susceptibility measurements, and differential thermal analysis (DTA). The existence of the ternary phase tau is corroborated and its crystal structure is confirmed to be isostructural to Cr3Ni5Si2. At 700 degrees C the homogeneity of this phase extends from 43 to 55 at.% iron at constant 20 at.% Si. Further-more, for the binary phases NiSi2, Ni2Si and Ni31Si12 extensive solubilities for iron are found, while the solubility of Fe in NiSi, Ni3Si2 or Ni3Si does not exceed 5 at.% On the other side of the system, the phases FeSi and Fe3Si have large solubilities for Ni, while this is rather limited in FeSi2. The (binary high temperature) phase Fe5Si3 is stabilized by Ni at least down to 700 degrees C. Tie lines exist between T and solid solutions based on Fe3Si, Ni31Si12 as well as gamma (Ni). DTA measurements for the vertical section Fe2Si-Ni2Si strongly indicate that Fe2Si and theta Ni2Si form a complete series of solid solutions theta(Fe, Ni)(2)Si and are thus isostructural. A critical evaluation of the available crystal structure data for Fe2Si Supports this assumption. Iron rich theta(Fe, Ni)(2)Si is a weak ferromagnet. The magnetic moment of similar to 1 mu B per Fe-atom in theta(Fe, Ni)(2)Si is only half of the magnetic moment per Fe-atom measured for tau Fe5Ni3Si2. A reaction scheme accounting for all DTA data of the entire system is established and in combination with observations on the first crystallizing phase(s) the liquidus surface of Fe-Ni-Si is revised. (C) 2008 Elsevier Ltd. All rights reserved.