Frontiers in Materials ( IF 2.6 ) Pub Date : 2020-05-11 , DOI: 10.3389/fmats.2020.00173 Sindy Fuhrmann , Guilherme N. B. M. de Macedo , René Limbach , Christina Krywka , Sebastian Bruns , Karsten Durst , Lothar Wondraczek
The transient (or permanent) structural modifications which occur during local deformation of oxide glasses are typically studied on the basis of short-range data, for example, obtained through vibrational spectroscopy. This is in contrast to macroscopic observations, where variations in material density can usually not be explained using next-neighbor correlations alone. Recent experiments employing low-frequency Raman spectroscopy have pointed-out this issue, emphasizing that the deformation behavior of glasses is mediated through structural heterogeneity and drawing an analogy to granular media. Here, we provide additional support to this understanding, using an alternative experimental method. Structural modification of vitreous silica in the stress field of a sharp diamond indenter tip was monitored by
中文翻译:
原位小角X射线散射探测玻璃硅压痕引起的结构变化
通常基于例如通过振动光谱法获得的短程数据来研究在氧化物玻璃的局部变形期间发生的瞬时(或永久)结构改变。这与宏观观察相反,在宏观观察中,通常不能仅使用邻域相关性来解释材料密度的变化。最近使用低频拉曼光谱的实验指出了这个问题,强调玻璃的变形行为是通过结构异质性来介导的,并且类似于颗粒介质。在这里,我们使用替代的实验方法为这种理解提供了额外的支持。玻璃二氧化硅在尖锐的金刚石压头应力场中的结构改变通过监测。