Good absorption properties in light-weight metallic materials

Abstract

In order to develop magnesium (Mg) alloys showing good absorption properties, the effect of alloying elements on mechanical properties was investigated using several kinds of Mg binary alloys and pure Mg. These materials, which were produced by hot extrusion, had a fine-grained structure, i.e., an average grain size of ~ 3 μm. As compared to that of pure Mg, most of the binary alloys showed higher yield strength due to solid solution strengthening effect, but the specific alloying element addition played a role in enhancing elongation-to-failure in both tension and compression testing. This specific binary alloy, namely the Mg-Mn alloy, exhibited an accordion-like deformation without any fractures, which has never been observed in the other/common Mg alloys. The absorption energy against fracture of this alloy was more than several times superior to that of the conventional wrought processed Mg alloy.