Investigating the Influence of Low-Intensity Pulsed Magnetic Fields on Microstructure Evolution and Mechanical Properties of A356 Aluminum Alloy

Abstract

This study explores the effects of varied pulsed magnetic field strengths (0 mT, 16 mT, and 80 mT) on the microstructure and mechanical properties of A356 aluminum alloy. Advanced characterization techniques including an electron universal stretching machine, metallographic microscope (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM), were employed. Key findings demonstrate a progressive enhancement in the alloy’s mechanical strength correlating with increased magnetic field intensities, achieving peak properties at 80 mT. This intensity level resulted in significant increases in tensile strength (27.35%), yield strength (19.05%), and elongation (9.23%) compared to the baseline (0 mT). SEM analyses reveal a marked improvement in both the quantity and size of eutectic Si under magnetic influence. EBSD outcomes show a notable shift in grain orientation disorder, with a clear preference emerging at the (111) crystal plane post 80 mT treatment. TEM examinations further confirm an uptick in Si particle numbers and Mg2Si phase precipitation at this intensity, indicating profound microstructural transformations induced by the magnetic field.