Elastic Heterogeneity in Metallic Glasses
Elastic Heterogeneity in Metallic Glasses
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DOI：
10.1103/physrevlett.105.205502
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发表时间：
2010-11-11
影响因子：
8.6
通讯作者：
Egami, T.
中科院分区：
文献类型：
--
作者：
Dmowski, W.;Iwashita, T.;Egami, T.
当应力施加在金属玻璃上时，它的变形遵循胡克定律。因此，金属玻璃的弹性变形似乎是显而易见的。用X射线衍射和各向异性对密度泛函分析表明，只有约3 4%的金属玻璃体积分数为弹性形变，其余体积为滞弹性，在实验时间尺度内无阻力形变。我们认为，这个滞弹性部分代表了玻璃状态下的剩余流动性。许多理论，如自由体积理论，假设玻璃态中的缺陷密度约为1%，但这一结果表明缺陷密度高达四分之一。
When a stress is applied on a metallic glass it deforms following Hook's law. Therefore it may appear obvious that a metallic glass deforms elastically. Using x-ray diffraction and anisotropic pair-density function analysis we show that only about 3 4 in volume fraction of metallic glasses deforms elastically, whereas the rest of the volume is anelastic and in the experimental time scale deform without resistance. We suggest that this anelastic portion represents residual liquidity in the glassy state. Many theories, such as the free-volume theory, assume the density of defects in the glassy state to be of the order of 1%, but this result shows that it is as much as a quarter.