Inhomogeneity Of Microstructures And Mechanical Properties Of 2219 Aluminum Alloy By Waam

Single wall specimens of 2219 aluminum alloy were built by wire and arc additive manufacturing (WAAM) technology using CMT welding process. The microstructure characteristics and mechanical properties in as-deposited state, solid solution state and artificial aging state were investigated. Results show that the weak strips with micro porosities, theta(Al2Cu) phases and iron rich phases in the interlayer region result in the anisotropic mechanical properties of the WAAM specimens. When the specimens are tensioned in the vertical direction, cracks form easily in the interlayer region, and the tensile strength and plasticity deteriorate. In order to increase the mechanical properties of WAAM 2219 aluminum alloy in the vertical direction, the content of Fe and Si in the wire should be as low as possible.