Dynamic creation and evolution of gradient-nano-grained structures in single-crystal metallic microcubes

In an article published today in Science, we have demonstrated the creation of an extreme gradient-nano-grained (GNG) structure in single-crystal microcubes through high-velocity impact. We use the defect-free single-crystal silver microcubes, synthesized using a seed-growth process, as the model system, and fire them at supersonic velocities onto a rigid target to create the GNG structure. We also study the created GNG structure over the course of several weeks and reveal that this nanostructure evolves through recrystallization at room temperature without any external thermal annealing. We believe that the GNG-structured metals with intermediate states of recrystallization holds promise for creating ultra-strong and tough metals, which have the potential to alleviate the brittle failure commonly found in nanocrystalline metals.

More details can be found in the paper: http://science.sciencemag.org/content/354/6310/312?panels_ajax_tab_tab=j...

Rice University press release: http://news.rice.edu/2016/10/20/smashing-metallic-cubes-toughens-them-up-2/

An explanatory animation: https://www.youtube.com/watch?v=yD8LEcc4hyA&feature=youtu.be

Rice University press release video: https://www.youtube.com/watch?v=arVIs6xQaxE&feature=youtu.be