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arXiv 1708.03540cond-mat.mtrl-sci
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金属玻璃复合材料的界面控制蠕变

Interface-controlled creep in metallic glass composites

Constanze Kalcher, Tobias Brink, Jochen Rohrer, Alexander Stukowski, Karsten Albe

摘要:

在这项工作中,我们提出了分子动力学模拟的$\rm Cu_{64}Zr_{36}$金属玻璃复合材料的蠕变行为。令人惊讶的是,所有复合材料都表现出比均匀玻璃高得多的蠕变速率。玻璃-晶体界面可以被视为弱界面相,其中剪切转变区的活化势垒低于周围玻璃中的活化势垒。我们观察到,复合材料的蠕变行为不仅取决于界面面积,但也对界面相对于加载轴的取向。我们提出了一个解释,在不同的平均施密特因子的接口,与非晶界面区域作为优先滑移网站。

英文摘要:

In this work we present molecular dynamics simulations on the creep behavior of $\rm Cu_{64}Zr_{36}$ metallic glass composites. Surprisingly, all composites exhibit much higher creep rates than the homogeneous glass. The glass-crystal interface can be viewed as a weak interphase, where the activation barrier of shear transformation zones is lower 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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