Abstract
It has been experimentally shown that the complete vaporization of Al and Cu fine wires due to a fast electrical explosion in vacuum requires 2-3 times the standard atomization enthalpy of ∼4 eV/atom. The expansion speed of a fully evaporated Al wire in vacuum is ∼10 km/s and ∼8 km/s for Cu wire. This excess of evaporation energy over tabulated enthalpy of atomization is related to the “pressure cooker effect,” when a fine metal wire is heated by a fast-rising current with high magnetic and hydrodynamic pressures. In our paper, we demonstrate self-consistent relationships between the deposited energy, expansion rate, and state of the wire core for Al and Cu fine wires.
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