Experimental study and thermodynamic assessment of the Al-Fe rich side of the Al-Zn-Fe system at 300 and 550聽掳 C

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• 作者：Qun Luo ; Ji-Long Chen ; Yang Li ; Fan Yang ; Qian Li ; Yue Wu ; Jie-Yu Zhang ; Kuo-Chih Chou ; ^{shukcc@126.com} ; ^{kcc126@126.com}
• 关键词：Al&ndash ; Zn&ndash ; Fe ternary phase diagram ; Isothermal section ; Diffusion couple ; CALPHAD method
• 刊名：Calphad
• 出版年：2012
• 期刊代码：8_03645916
• 类别：ms
• 出版时间：June, 2012
• 卷：37
• 期：Complete
• 页码：116-125
• 文件大小：1473 K

摘要

The phase relations of the Al-Zn-Fe system on the Al-Fe rich side at 300 and 550聽掳C were studied by means of the diffusion couple technique. The morphologies of Al_96.2Zn_3.8/Fe diffusion couples were observed by scanning electron microscopy (SEM) and the composition profiles were determined using energy dispersive spectroscopy (EDS). The intermetallics layer formed between the Al_96.2Zn_3.8 and Fe end-members were mainly Fe₂Al₅ phase. The diffusion path identified at 300聽掳C was (Al)鈫扚e₄Al₁₃鈫扚e₂Al₅鈫抌cc(Fe)鈫?Fe), and that was (Al)鈫扚e₄Al₁₃鈫扚e₂Al₅鈫?Fe) at 550聽掳C. Based on the literature information and the current experimental results, the Al-Zn-Fe system was re-assessed thermodynamically with a CALPHAD approach. The calculated phase diagrams at 300, 450 and 550聽掳C agreed well with current experimental results as well as the data from the literature.