Abstract
Using nanoscale electrical-discharge-induced rapid Joule heating, we developed a method for ultrafast shape change and joining of small-volume materials. Shape change is dominated by surface-tension-driven convection in the transient liquid melt, giving an extremely high strain rate of ~106 s–1. In addition, the heat can be dissipated in small volumes within a few microseconds through thermal conduction, quenching the melt back to the solid state with cooling rates up to 108 K·s-1. We demonstrate that this approach can be utilized for the ultrafast welding of small-volume crystalline Mo (a refractory metal) and amorphous Cu49Zr51 without introducing obvious microstructural changes, distinguishing the process from bulk welding.
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Wang, CC., Li, QJ., Chen, L. et al. Ultrafast shape change and joining of small-volume materials using nanoscale electrical discharge. Nano Res. 8, 2143–2151 (2015). https://doi.org/10.1007/s12274-014-0685-7
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DOI: https://doi.org/10.1007/s12274-014-0685-7