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Observation of Instabilities during Plastic Deformation by in-situ SEM Indentation Experiments

✍ Scribed by B. Moser; J. Kuebler; H. Meinhard; W. Muster; J. Michler

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 311 KB
Volume: 7
Category: Article
ISSN: 1438-1656
DOI: 10.1002/adem.200500049

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✦ Synopsis

This communication presents results on the observation of pop‐ins and shear band formation during indentation in a Zr‐based bulk metallic glass (Vitreloy‐105). The focus is on in‐situ SEM experiments using a recently developed miniaturized instrumented indentation system that can be used inside the SEM chamber. Using frames from a video sequence, a partial correlation between displacement bursts in the load‐displacement curve and shear band activity at the specimen surface could be established for the first time.

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## Abstract The results of macroscopic strain rate and temperature cycling tests on MgO single crystals are compared with the results of in‐situ deformation tests in a HVEM on the basis of the basis of the thermally activated dislocation glide model. The activation volume estimated by strain rate c