Experimental determination of phase equilibria of Al-rich portion in the Al-Fe binary system
Experimental determination of phase equilibria of Al-rich portion in the Al-Fe binary system
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DOI：
10.1016/j.jallcom.2016.01.215
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发表时间：
2016-05-25
影响因子：
6.2
通讯作者：
Kainuma, R.
中科院分区：
文献类型：
--
作者：
Han, K.;Ohnuma, I.;Kainuma, R.
通过传统的平衡热处理、扩散偶联法和热分析确定了Al-Fe二元相图中的富al部分。除theta-Fe4Al13相溶解度范围外，平衡组成在1000℃以内与文献中普遍接受的相图基本一致。随着温度的升高，α - fe2al5和α - fe4al13相的溶解度范围增大，并向富铁侧倾斜。通过扩散偶法和DSC测量的加热曲线确定了epsilon-Fe5Al8相的相界和共析组成，并在Fe浓度较高时略有偏移。DSC加热曲线测定的液相、固相和不变反应的转变温度大多低于Kattner和Burton评价的相图。考虑到eta-Fe2Al5 + theta-Fe4Al13相的平衡组成和theta-Fe4Al13相的固相温度，本研究确定了与theta-Fe4Al13相形成相关的一个不变反应为Liquid + eta-Fe2Al5 = theta-Fe4Al13的包晶反应。(C) 2016 Elsevier B.V.版权所有
Al-rich portion of the Al-Fe binary phase diagram was determined by conventional heat-treatment for equilibration, the diffusion couple method and thermal analysis. Equilibrium compositions are mostly coincident with the generally accepted phase diagram in the literature up to 1000 degrees C, except the solubility range of theta-Fe4Al13 phase. The solubility ranges of the eta-Fe2Al5 and the theta-Fe4Al13 phases were confirmed to increase and incline to the Fe-rich side with increasing temperature. Phase boundaries and the eutectoid composition of the epsilon-Fe5Al8 phase were determined from the diffusion couple method and heating curves of DSC measurement, which were slightly shifted to a higher Fe concentration. Transformation temperatures of liquidus, solidus and invariant reactions determined from heating curves of DSC measurement were mostly lower than those in the phase diagram evaluated by Kattner and Burton. An invariant reaction related to the formation of the theta-Fe4Al13 phase was confirmed as the peritectic reaction of Liquid + eta-Fe2Al5 = theta-Fe4Al13 in this study taking equilibrium compositions of the eta-Fe2Al5 + theta-Fe4Al13 phases and solidus temperatures of the theta-Fe4Al13 phase into consideration. (C) 2016 Elsevier B.V. All rights reserved.