Rare causative spotted
"Switching strength on and off", Nature 6/9/2011:
A material has been designed to switch back and forth between a strong, brittle state and a weak, ductile one.
Hai-Jun Jin at the Chinese Academy of Sciences in Shenyang and Jörg Weissmüller at the Technical University of Hamburg in Germany made their composite by imbibing nanoporous gold (pictured) with an electrolyte. When the applied electrical potential shifted, the material showed distinct and reversible changes in strength, flow stress and ductility.
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