Effect of pulsating solidification on the surface properties of conductive materials

Qin, Rongshan and Bhagurkar, Ashutosh (2022). Effect of pulsating solidification on the surface properties of conductive materials. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 478(2261), article no. 20210726.

DOI: https://doi.org/10.1098/rspa.2021.0726

Abstract

Application of pulsed electric current to solidifying conductive materials leads to a rapid and significant reduction of surface roughness. This is validated experimentally in the present work for multicomponent oxides. The surface geometry of the casts without and with pulsating treatment was measured using Leica DCM-3D Profiler. The pulsating treatment reduces the roughness of solidified materials by >50%. The unmeasurable points, which account for nearly 2% of total area, were interpolated using an artificial multilayer neural network. Both the experimentally measured and neural network interpolated surface profile data were implemented to the calculation of electric current free energy. The results show that the electric current free energy can overtake surface energy and provide a significant driving force to the kinetics of surface evolution in solidification. Distortion of electric field is noticed around the interface.

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