[New]Paper Received by Nature Communications: Hydrogenated Vacancies Lock Dislocations in Aluminium
Hydrogen is the most abundant element, both in the universe and on earth. As an element with the simplest atomic structure and smallest volume, hydrogen can easily dissolve into many solid materials, changing their properties. In many industrially important metals during processing or service, hydrogen often has deleterious consequence on mechanical properties that is commonly referred to as hydrogen embrittlement (HE), thus has been a wide concern in industry and academia for over a century.
Despite numerous efforts over the past century, the exact mechanism of hydrogen effects on the ability of the material to plastically deform remains controversial, thus knowing how hydrogen interacts with dislocation – the primary carriers of plasticity is essential. Due to its high diffusivity, hydrogen is often considered a weak inhibitor or even a promoter of dislocation movements in metals and alloys.
But our latest experimental discovery subverts the established cognition in the past decades.
The project is supervised by Prof. Zhiwei Shan and Prof. Ju Li. Besides vice Prof. Zhangjie Wang and Dr. Meng Li from our faculty and post Dr. Suzhi Li, Prof. Peter Gumbsch, Prof. Jun Sun, Prof. Evan Ma also made a significant contribution to this work.
This work has been published on the top research journal, Nature Communications.
The article can be accessed at http://www.nature.com/articles/ncomms13341