|About this Abstract
||MS&T22: Materials Science & Technology
||Advanced Materials for Harsh Environments
||Corrosion Phenomena in Powder-Processed Aluminum Alloys Containing Quasicrystalline Dispersoids
||Sarshad Rommel, Hannah R Leonard, Mingxuan Li, Thomas J Watson, Tod Policandriotes, Mark Aindow
|On-Site Speaker (Planned)
The aperiodic structures of quasicrystals (QCs) give rise to an unusual combination of mechanical properties including high hardness, strength, elastic modulus and wear resistance. These properties have generated raised significant interest in the use of QCs for next generation structural materials in aerospace applications. Recently, we have developed a series of Al-Cr-Mn-Co-Zr alloys that exhibits a nano-composite FCC Al matrix plus QC dispersoid microstructure in gas-atomized powders. These alloys have excellent mechanical properties but also exhibit remarkable pitting corrosion resistance in salt fog exposures. A combination of scanning and transmission electron microscopy, X-ray diffraction, and electrochemical techniques have been used to investigate the corrosion behavior of these alloys upon exposure to Cl- rich environments. The impact of alloy composition and upset forging on the corrosion phenomena occurring on these alloys is discussed, with an emphasis on the role of microstructure and the QC phase.