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In-situ micro-cantilever bending test in environmental scanning electron microscope: Real time observation of hydrogen enhanced cracking

Deng, Yun; Hajilou, Tarlan; Wan, Di; Kheradmand, Nousha; Barnoush, Afrooz
Journal article
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URI
http://hdl.handle.net/11250/2586107
Date
2017
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  • Institutt for maskinteknikk og produksjon [2530]
  • Publikasjoner fra CRIStin - NTNU [19817]
Original version
Scripta Materialia. 2017, 127 19-23.   10.1016/j.scriptamat.2016.08.026
Abstract
A novel approach of in-situ micro-cantilever bending tests is introduced, integrating nanoindentation and environmental scanning electron microscopy (ESEM) to elucidate hydrogen embrittlement (HE) in FeAl. Bending tests were performed in vacuum (~ 5 × 10− 4 Pa) and in ESEM with water vapor (180 Pa, 450 Pa) conditions, which introduce H in-situ into the cantilevers during the test. Micro-scale In-situ SEM testing provides a full control of all the parameters involved in HE as well as avoids the proximity effect from the free surface, which is always criticized in nano-scale in-situ TEM experiments. Both hydrogen induced cracking and hydrogen reduced flow stress were observed.
Publisher
Elsevier
Journal
Scripta Materialia

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