Significantly Enhancing the Ignition/Compression/Damping Response of Monolithic Magnesium by Addition of Sm2O3 Nanoparticles

Abstract

The present study reports the development of Mg–Sm2O3 nanocomposites as light-weight materials for weight critical applications targeted to reduce CO2 emissions, particularly in the transportation sector. Mg-0.5, 1.0, and 1.5 vol % Sm2O3 nanocomposites are synthesized using a powder metallurgy method incorporating hybrid microwave sintering and hot extrusion. The microstructural studies showed dispersed Sm2O3 nanoparticles (NPs), refinement of grain size due to the presence of Sm2O3 NPs, and presence of limited porosity. Microhardness and dimensional stability of pure Mg increased with the progressive addition of Sm2O3 NPs. The addition of 1.5 vol % of Sm2O3 NPs to the Mg matrix enhanced the ignition temperature by ~69 °C. The ability of pure Mg to absorb vibration also progressively enhanced with the addition of Sm2O3 NPs. The room temperature compressive strengths (CYS and UCS) of Mg–Sm2O3 nanocomposites were found to be higher without having any adverse effect on ductility, leading to a significant increase in energy absorbed prior to compressive failure. Further, microstructural characteristics are correlated with the enhancement of various properties exhibited by nanocomposites.

Keywords

• Magnesium
• Sm2O3 nanoparticles
• compression properties
• damping
• microstructure
• ignition