DEFORMABLE AND CORROSION RESISTANT NOVEL MAGNESIUM ALLOYS VIA RAPID SOLIDIFICATION

摘要

The product is novel and corrosion resistant Mg-based alloys for hot extrusion produced via rapid solidification melt spinning process.In RSMS molten metal is ejected by pressure onto a high speed rotating wheel. The extreme super-cooling rate forms fine thin continuous ribbons, possessing extra fine grain structure. These are further comminuted, degassed, consolidated and compressed into cylindrical form. Through the addition of a substantial amount of lithium (Li), a highly deformable BCC lattice is formed. Favorable characteristics are maintained in the chopped and compressed ribbons. Specific gravity decreases; mechanical properties increase; corrosion resistance is enhanced, and, also extrusion parameters become better (i.e., higher extrusion rate at lower temperatures). The R&D activities consist of design and preparation of new Mg-Li based alloys (with addition of other elements such as Al and Si); optimization of RSMS process; characterization of alloys; optimization of consolidation, and, near-net-shape forming. Electrochemical and mechanical properties evaluation will follow.