Accalia Robinson , Eric R. Homer , Gregory B. Thompson
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引用次数: 0
摘要
数字图像相关性(DIC)是利用光学和扫描电子显微镜方法绘制变形过程中局部应变图的常规应用。在这封信中,我们报告了其在纳米晶金属的原位 TEM 成像变形演变中的应用。由于透射电子会产生复杂的对比度条件,而这种对比度与变形机制有关,因此,如果在图像分析和解释方面特别谨慎,就可以跟踪这些变化。我们介绍了通过帧平均实现这种相关性的方法。利用这些集体相关条件,我们发现 DIC 平均应变与远场应变值非常吻合,从而增加了应用的信心。通过在 TEM 中使用 DIC,可以进一步阐明纳米级变形机制,因为 TEM 提供了更高的空间分辨率。
Application of digital image correlation for in-situ deformation studies using transmission electron microscopy
Digital Image correlation (DIC) is routinely applied using optical and scanning electron microscopy methods to map local strains during deformation. In this letter, we report its use for in-situ TEM imaged deformation evolution for a nanocrystalline metal. Since transmitted electrons give rise to complex contrast conditions, with such contrast associated with the mechanisms of deformation, one can track these changes if particular care is done in image analysis and interpretation. We describe these methodologies to enable this correlation through frame averaging. Using these collective correlation conditions, we found that the average DIC strain matches well with the far field strain values yielding increased confidence in its application. Through the utilization of DIC in the TEM, nanoscale deformation mechanisms can be further elucidated because of the increased spatial resolution offered by TEM.
期刊介绍:
Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.