Microstructure and corrosion behaviour of wire arc additive manufactured AA2024 alloy thin wall structure
Xinxin Zhang, You Lv, Sihan Tan, Zehua Dong, Xiaorong Zhou
Abstract
In the present work, the microstructure and corrosion behaviour of wire arc additive manufactured (WAAM) AA2024 alloy thin wall structure are investigated. Three distinctive zones are present in the WAAM structure, including melt pool zone (MPZ), melt pool border (MPB) and heat affected zone (HAZ). Localized corrosion initiates at the multi-phase lamellar eutectic structure via de-alloying of S-phase (Al2CuMg) intermetallics. MPB is most susceptible to localized corrosion due to its relatively high volume fraction of eutectic S-phase resulted from alloying elements segregation during solidification.
Topics & Concepts
Materials scienceMicrostructureEutectic systemMetallurgyCorrosionAlloyLamellar structureIntermetallicPhase (matter)Volume fractionComposite materialChemistryOrganic chemistryAdditive Manufacturing Materials and ProcessesAdditive Manufacturing and 3D Printing TechnologiesAluminum Alloys Composites Properties