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

详细信息    查看全文

• 作者：Y. Deng ; T. Hajilou ; D. Wan ; N. Kheradmand ; A. Barnoush ; ^{afrooz.barnoush@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; ^{afrooz.barnoush@ntnu.no" class="auth_mail" title="E-mail the corresponding author}
• 关键词：In-situ test ; Iron aluminides (FeAl) ; Hydrogen embrittlement
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：19-23
• 全文大小：1174 K

文摘

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.