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Xiaodong Han, Ze Zhang, B21-O-14
Ultra-large elasticity and Liquid-like behavior of Nano-materials , Microscopy, Volume 64, Issue suppl_1, November 2015, Page i46, https://doi.org/10.1093/jmicro/dfv144Close - Share Icon Share
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When reducing the size of the crystalline and amorphous materials, the defects contained in the small scale crystals and solids were reduced and this significantly promotes the strength and elastic strain abilities of these small scale samples. We report the large elastic strains in free-standing single crystalline Si, Cu and Ni nanowires as well as metallic glass CuZr nanowires. For Cu single-crystalline NWs, the elastic-plastic transition is size-dependent. An ultra-large elastic strain of 7.2%, which approaches the theoretical elasticity limit, can be achieved as the diameter of the NWs decreases to 〜6 nm. In bending Ni nanowires, an unprecedented continuous ultra-large lattice strains up to 34% was demonstrated. Further, these outstanding elastic properties of free standing nanowires was achieved in Nb-NiTi nanowire-shape memory alloy in situ composites. Finally, a rubber-like recovery character was demonstrated in Cu nanowires (with diameter of more than 30nm) by an apparent-recovery strain of more than 40%. This liquid-like behaviour was related to an enhanced surface diffusion process assisted by the stored ultra-large elastic energy.
