Fe-Al-Si三元扩散偶中合金元素扩散行为的动力学计算

来源期刊：上海金属2010年第6期

论文作者：何燕霖 何忠平 李麟

文章页码：1 - 4

关键词：Fe-Al-Si体系； 扩散偶； Thermo-Calc & DICTRA软件

Key words：Fe-Al-Si System； Diffusion Couples； Thermo-Calc & DICTRA Software

摘    要：建立了Fe-6.8%Al-1.0%Si/Fe和Fe-6.3%Al-0.9%Si/Fe两组扩散偶,分别对其进行1050℃×3h和1000℃×64h的退火处理,而后采用EPMA技术对合金元素在不同扩散偶中的成分分布进行测定;同时结合Fe-Al-Si体系的热力学与动力学性质,采用Thermo-Calc&DICTRA软件中的移动界面模型,对Fe、Al和Si元素随温度与时间的浓度变化情况进行了模拟计算,计算结果与实验测定的成分分布数据吻合得较好,从而验证了计算中所采用热力学与动力学参数的有效性,并可为模拟相关合金体系中相组成的演变行为提供计算依据。

Abstract: Diffusion couples of Fe-6.8%Al-1.0%Si/Fe and Fe-6.3%Al-0.9%Si/Fe were prepared and annealed for 3 h at 1 050℃ and 64 h at 1 000 ℃ respectively. The concentration profiles of Fe, Al and Si atoms in these couples were measured by EPMA. Aided by Thermo-Calc & DICTRA software package, also the concentration profiles of Fe, Al and Si in established diffusion couples were calculated by moving boundary model coupling thermodynamic and kinetic properties of Fe-Al-Si system. The simulation results were in good agreement with the measured concentration profiles, which showed the validity of thermodynamic and kinetic parameters of Fe-Al-Si system. It could provide the parameters for simulation of the microstructural evolution behavior of relevant alloy system.