Study of the Dependences of the Characteristics of a Pulse Discharge Current vs the Phase State of a Liquid-Metal Conductor

摘要

The characteristics of a pulse discharge current flowing through a conductor made from Al-7% Si alloy within the temperature range of 700-500°C are experimentally investigated. It is found that the cooling and phase transition of a conductor from a liquid to solid state is accompanied by the contraction of the amplitude of the pulse sine wave current, by the increase of the damping decrement and of the oscillation period, and by the displacement of the oscillatory spectrum to an area of lower frequencies. A peculiarity of the temperature dependences of the pulse characteristics is the occurrence of discontinuities and excesses at the characteristic liquidus and solidus points. It is assumed that the observed changes are due to the increase of the active resistance and reactance (inductive) components of the full resistance during the cooling and solidification.