Self-Healing and Shape Memory Effects in Gold Microparticles through the Defects-Mediated Diffusion
Oleg Kovalenko, Christian Brandl, Leonid Klinger, Eugen Rabkin
ADVANCED SCIENCE | WILEY | Published : 2017
Some metal alloys subjected to irreversible plastic deformation can repair the inflicted damage and/or recover their original shape upon heating. The conventional shape memory effect in metallic alloys relies on collective, or "military" phase transformations. This work demonstrates a new and fundamentally different type of self-healing and shape memory in single crystalline faceted nano and microparticles of pure gold, which are plastically deformed with an atomic force microscope tip. It is shown that annealing of the deformed particles at elevated temperatures leads to nearly full recovery of their initial asymmetric polyhedral shape, which does not correspond to global energy minimum sha..View full abstract
O.K. and C.B. contributed equally to this work. This work was partially supported by the Russell Berrie Nanotechnology Institute at the Technion. The thin film processing was performed at the Micro-Nano Fabrication and Printing Unit (MNF&PU), Technion. The help of Mr. Dmitry Peselev with the photolithograpy processing is heartily acknowledged.