Ultrafast shape change and joining of small-volume materials using nanoscale electrical discharge

TitleUltrafast shape change and joining of small-volume materials using nanoscale electrical discharge
Publication TypeJournal Article
Year of Publication2015
AuthorsWang, C-C, Li, Q-J, Chen, L, Cheng, Y-H, Sun, J, Shan, Z-W, Li, J, Ma, E
JournalNano Research
Volume8
Issue7
Pagination2143 - 2151
Date Published2015/07//
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 similar to 10(6) 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 10(8) 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.