|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Surface Engineering for Improved Corrosion Resistance
||Oxidation and Corrosion Phenomena in Powder-processed Icosahedral-phase-strengthened Aluminum Alloys
||Sarshad Rommel, Hannah Leonard, Thomas Watson, Venkat Vedula, Mark Aindow
|On-Site Speaker (Planned)
Recently, we have developed an Al-Cr-Mn-Co-Zr alloy that exhibits a nano-composite FCC Al plus I-phase microstructure in gas-atomized powder. This microstructure is retained during consolidation of the powder to form bulk material or cold-sprayed coatings, and the materials exhibit a remarkable combination of mechanical properties and pitting corrosion resistance. Here we report a study on the dry oxidation and aqueous pitting corrosion behavior in a series of three more dilute Al-Cr-Mn-Co-Zr alloys. These alloys contain the same phases as the original alloy, but there are variations in the I-phase morphology and distribution. A combination of electron microscopy techniques has been used to evaluate the alloy surfaces after elevated temperature exposure in dry laboratory air, after standard ASTM salt-fog testing, and after potential cycling in saline solutions. Local variations in the oxide scales and pit formation are related to the underlying alloy microstructures, and the mechanisms involved are discussed.
||Planned: Supplemental Proceedings volume