Interface-controlled creep in metallic glass composites
Interface-controlled creep in metallic glass composites
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DOI：
10.1016/j.actamat.2017.08.058
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发表时间：
2017-08
期刊：
影响因子：
9.4
通讯作者：
Constanze Kalcher;Tobias Brink;J. Rohrer;A. Stukowski;K. Albe
中科院分区：
文献类型：
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作者：
Constanze Kalcher;Tobias Brink;J. Rohrer;A. Stukowski;K. Albe
本文对cu64zr36金属玻璃复合材料的蠕变行为进行了分子动力学模拟。我们的研究结果表明，所有的复合材料都表现出比均匀玻璃更高的蠕变速率。这是因为玻璃晶体界面就像一个弱的界面相，这里的剪切转变区比周围的玻璃更容易激活。我们观察到复合材料的蠕变行为不仅与界面面积有关，而且与界面相对于加载轴的方向有关。我们从界面的不同平均施密德因子的角度提出了一种解释，其中非晶界面区域作为优先滑移位点。
In this work we present molecular dynamics simulations on the creep behavior of Cu64Zr36metallic glass composites. Our results reveal that all composites exhibit much higher creep rates than the homogeneous glass. This is because the glass–crystal interface acts like a weak interphase, where the activation of shear transformation zones is easier than in the surrounding glass. We observe that the creep behavior of the composites does not only depend on the interface area but also on the orientation of the interface with respect to the loading axis. We propose an explanation in terms of different mean Schmid factors of the interfaces, with the amorphous interface regions acting as preferential slip sites.