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Yin, Sheng ; Cheng, Guangming ; Richter, Gunther ; Gao, Huajian ; Zhu, Yong ( , ACS Nano)
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Yin, Sheng ; Cheng, Guangming ; Chang, Tzu-Hsuan ; Richter, Gunther ; Zhu, Yong ; Gao, Huajian ( , Nature Communications)
Abstract Although hydrogen embrittlement has been observed and extensively studied in a wide variety of metals and alloys, there still exist controversies over the underlying mechanisms and a fundamental understanding of hydrogen embrittlement in nanostructures is almost non-existent. Here we use metallic nanowires (NWs) as a platform to study hydrogen embrittlement in nanostructures where deformation and failure are dominated by dislocation nucleation. Based on quantitative in-situ transmission electron microscopy nanomechanical testing and molecular dynamics simulations, we report enhanced yield strength and a transition in failure mechanism from distributed plasticity to localized necking in penta-twinned Ag NWs due to the presence of surface-adsorbed hydrogen. In-situ stress relaxation experiments and simulations reveal that the observed embrittlement in metallic nanowires is governed by the hydrogen-induced suppression of dislocation nucleation at the free surface of NWs.
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Cheng, Guangming ; Yin, Sheng ; Chang, Tzu-Hsuan ; Richter, Gunther ; Gao, Huajian ; Zhu, Yong ( , Physical Review Letters)
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Chen, Lisa Y. ; Richter, Gunther ; Sullivan, John P. ; Gianola, Daniel S. ( , Physical Review Letters)