Abstract
Electromagnetic smog, capable of deranging the current networks and human health, is dominant in recent times due to the widespread electronics usage. To avoid the electromagnetic threats, technological advances in terms of designing materials based on Al are being made. Mg alloys, known for their light weight and excellent specific mechanical properties, have potential to replace Al in structural applications. However, there is a dearth in the information pertaining to electromagnetic interference (EMI) shielding effectiveness (SE) of magnesium and the impact of the microstructural defects on it. Thus, the principal objective of this effort is to identify the influence of defects like grain/dendritic boundaries and porosity on EMI SE of magnesium and aluminum, in the micro/radio frequency ranges. In order to obtain Mg with different microstructures, processing parameters like mold type (steel, copper) and super heat temperatures (720, 750 °C) were varied. The results of this study indicate that the EMI SE is strongly reliant on the porosity and grain/dendritic boundaries of the material. Further, it is also observed that, Mg (33% lighter than Al) exhibited comparable shielding effectiveness capabilities to that of Al (synthesized using the same processing parameters), validating the scope for replacement of Al based materials with Mg based materials for applications in the field of electromagnetic shielding where weight reduction is desired.
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