Direct observation of electron-beam-induced densification and hardening of silica nanoballs by in situ transmission electron microscopy and finite element method simulations
Direct observation of electron-beam-induced densification and hardening of silica nanoballs by in situ transmission electron microscopy and finite element method simulations
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DOI：
10.1016/j.actamat.2014.05.046
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发表时间：
2014-10-15
期刊：
影响因子：
9.4
通讯作者：
Spiecker, E.
中科院分区：
文献类型：
--
作者：
Mackovic, M.;Niekiel, F.;Spiecker, E.
我们报告使用原位透射电子显微镜技术和有限元方法模拟研究电子束辐照对纳米级无定形二氧化硅球的变形行为和力学性能的影响。我们发现，在纳米尺度上，电子束照射二氧化硅的结果在非热致密化和同时材料硬化。它演示了如何致密化的量可以通过照射剂量控制，使用特定的束电流密度内的透射电子显微镜。电子束诱导致密化被解释为所观察到的硬化效应的直接原因。有限元方法模拟被用来模拟的二氧化硅球的机械响应，确认的固有特性（如杨氏模量）的无定形二氧化硅可以定制与电子束在纳米尺度上。(C)2014 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
We report on the use of in situ transmission electron microscopy techniques and finite element method simulations to study the influence of electron beam irradiation on the deformation behavior and mechanical properties of nanoscale amorphous silica balls. We show that, on the nanometer scale, electron beam irradiation of silica results in athermal densification and simultaneous material hardening. It is demonstrated how the amount of densification can be controlled via the irradiation dose, using specific beam current densities inside a transmission electron microscope. The electron-beam-induced densification is interpreted as the direct reason for the observed hardening effect. Finite element method simulations are used to model the mechanical response of the silica balls, confirming that the intrinsic properties (such as the Young's modulus) of amorphous silica can be tailored with the electron beam on the nanoscale. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.