Predicting the glass-forming ability of rare earth-contained Fe-based alloys by features of dynamic transition in their melts
Predicting the glass-forming ability of rare earth-contained Fe-based alloys by features of dynamic transition in their melts
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DOI：
10.1016/j.jnoncrysol.2020.120020
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发表时间：
2020-06
影响因子：
3.5
通讯作者：
Yunbo Zhao;Yanwen Bai;Yijun Ding;Lina Hu
中科院分区：
文献类型：
--
作者：
Yunbo Zhao;Yanwen Bai;Yijun Ding;Lina Hu
在本工作中，我们首先研究了Fe-B-(Nb)-Y和Fe-(Co)-Cr-Mo-C-B-Y两个稀土合金系统在远高于其液相线温度时的动力学行为特征。与在不含稀土元素的铁基熔体中观察到的相对明显的粘度不连续相比，这种不连续变得不明显。然而，对检测到的粘度数据的分析表明，两种合金体系中仍然存在动态交叉。用代表冷却过程中动态转变程度的参数F对这两个合金系统的动态转变特征进行了量化，并观察到与玻璃形成能力(GFA)呈负相关。建立了一个微观结构演变的情景来解释这种相关性。这项工作有助于从熔体动力学的角度控制含稀土铁基合金的GFA，这是一个长期存在的液-固遗传问题。
In this work, we firstly focus on the features of dynamic behaviors of two rare earth-contained alloy systems Fe-B-(Nb)-Y and Fe-(Co)-Cr-Mo-C-B-Y well above their liquidus temperatures. Compared with a relatively distinct viscosity discontinuity observed in the Fe-based melts without rare earth elements, such discontinuity becomes indistinct. However, analysis on the detected viscosity data indicates a dynamic crossover still exists in both of the two alloy systems. Using the parameterFrepresenting the degree of the dynamic transition during cooling, the feature of the dynamic transition in these two alloy systems has been quantified and the negative correlation ofFand the glass-forming ability (GFA) has been observed. A scenario of microstructural evolution has been built to explain this correlation. This work sheds light on controlling the GFA of rare earth-contained Fe-based alloys from the viewpoint of the melt dynamics, which belongs to the long-term standing issue of the liquid-solid inheritance.