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A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion

Strong and ductile materials that have high resistance to corrosion and hydrogen embrittlement are rare and yet essential for realizing safety-critical energy infrastructures, hydrogen-based industries, and transportation solutions. Here we report how we reconcile these constraints in the form of a...

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Detalles Bibliográficos
Autores principales: Luo, Hong, Sohn, Seok Su, Lu, Wenjun, Li, Linlin, Li, Xiaogang, Soundararajan, Chandrahaasan K., Krieger, Waldemar, Li, Zhiming, Raabe, Dierk
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7299985/
https://www.ncbi.nlm.nih.gov/pubmed/32555177
http://dx.doi.org/10.1038/s41467-020-16791-8
Descripción
Sumario:Strong and ductile materials that have high resistance to corrosion and hydrogen embrittlement are rare and yet essential for realizing safety-critical energy infrastructures, hydrogen-based industries, and transportation solutions. Here we report how we reconcile these constraints in the form of a strong and ductile CoNiV medium-entropy alloy with face-centered cubic structure. It shows high resistance to hydrogen embrittlement at ambient temperature at a strain rate of 10(−4) s(−1), due to its low hydrogen diffusivity and the deformation twinning that impedes crack propagation. Moreover, a dense oxide film formed on the alloy’s surface reduces the hydrogen uptake rate, and provides high corrosion resistance in dilute sulfuric acid with a corrosion current density below 7 μA cm(−2). The combination of load carrying capacity and resistance to harsh environmental conditions may qualify this multi-component alloy as a potential candidate material for sustainable and safe infrastructures and devices.