|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Magnesium Technology 2016
||P-6: A High Specific Strength and Corrosion Resistant Magnesium Alloy: Realizing the Nexus
||Wanqiang Xu, Michael Ferry
|On-Site Speaker (Planned)
It has long been sought to create ultra-lightweight alloys with high strength, ductility and corrosion resistance. An inherent problem is the latter two properties are inversely correlated with strength. We break this paradox via design of an ultra-low density (1.4 g/cm3) Mg-Li-based alloy that is strong, ductile, and more corrosion resistant than any other Mg alloy. Unprecedented properties were achieved by engineering a novel Li-rich, solute-nanostructured body centred cubic (BCC) matrix. Corrosion resistant Mg-Li seems counterintuitive due to the chemical reactivity of Li in Mg. In conventional hexagonal (HCP) Mg-alloys, corrosion is promoted by incomplete surface film coverage, intensified by second-phases. Our BCC alloy forms a uniform protective surface film incorporating sparingly soluble lithium-carbonate. The ultra-fine nanostructure is electrochemically ‘invisible’ whilst the alloy offers optimized surface coverage as opposed to HCP or BCC+HCP Mg alloys. A carefully engineered nanostructure has enabled us to create a stainless form of high-strength magnesium.
||Planned: A combination print-CD volume