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Hydrogen-enhanced cracking revealed by in situ micro-cantilever bending test inside environmental scanning electron microscope

Deng, Yun; Hajilou, Tarlan; Barnoush, Afrooz
Journal article
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Yun_Philo_Trans_A.pdf (7.918Mb)
Permanent lenke
http://hdl.handle.net/11250/2586105
Utgivelsesdato
2017
Metadata
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  • Institutt for maskinteknikk og produksjon [2517]
  • Publikasjoner fra CRIStin - NTNU [19736]
Originalversjon
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 2017, 375 (2098), .   10.1098/rsta.2017.0106
Sammendrag
To evaluate the hydrogen (H)-induced embrittlement in iron aluminium intermetallics, especially the one with stoichiometric composition of 50 at.% Al, a novel in situ micro-cantilever bending test was applied within an environmental scanning electron microscope (ESEM), which provides both a full process monitoring and a clean, in situ H-charging condition. Two sets of cantilevers were analysed in this work: one set of un-notched cantilevers, and the other set with focused ion beam-milled notch laying on two crystallographic planes: (010) and (110). The cantilevers were tested under two environmental conditions: vacuum (approximately 5 × 10−4 Pa) and ESEM (450 Pa water vapour). Crack initiation at stress-concentrated locations and propagation to cause catastrophic failure were observed when cantilevers were tested in the presence of H; while no cracking occurred when tested in vacuum. Both the bending strength for un-notched beams and the fracture toughness for notched beams were reduced under H exposure. The hydrogen embrittlement (HE) susceptibility was found to be orientation dependent: the (010) crystallographic plane was more fragile to HE than the (110) plane.
Utgiver
The Royal Society
Tidsskrift
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

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