|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||D-59: Evaluation of β-phase Formation in 5xxx Aluminum Alloys
||William Golumbfskie, Emily Holcombe, Kyle Matthews, Daniel Foley, Mitra Taheri
|On-Site Speaker (Planned)
5xxx aluminum alloys are considered sensitized when magnesium precipitates out of solution forming a deleterious β-phase (Mg2Al3) around grain boundaries. It has been observed that β-phase may preferentially form along the grain boundaries or within the matrix, depending on prior processing and resultant microstructure. Initial results have suggested that dislocation density plays an important role in this behavior. This investigation will present a critical analysis of the factors affecting β-phase precipitation. The extent of sensitization and likelihood of stress corrosion cracking will be characterized with respect to the processing variability inherent in 5xxx alloys, as well as laboratory induced deformation and heat treatments. The geometrically necessary dislocation (GND) densities will be calculated from EBSD analysis. Microstructural characterization will be performed by a combination of light optical and electron microscopy. ASTM G66 and G67 testing will be conducted to determine susceptibility to corrosion attack.
||Planned: Light Metals