Study on microstructure and property evolution of additive manufactured 2219 aluminum alloy under unidirectional compression and multidirectional loading deformation

Abstract

The additive manufacturing technology of high strength 2219 aluminum alloy has been widely used in aerospace field. In this paper, coarse microstructure and poor mechanical properties of as-deposited 2219 Al alloy was focused, unidirectional compression and multidirectional loading deformation were studied, and the evolution law of microstructure and tensile properties was analysed. The results show that the deformation mainly concentrated in the core of uniaxial compression sample. The dynamic recrystallization was dominant above 450 °C. The lamellar microstructure was com pletely eliminated after multidirectional loading deformation, and hydrogen pores were completely closed. The yield stress reached 224 MPa, the ultimate tensile stress reached 386 MPa, and the elongation reached 11%, indicating that the improvement effect on microstructure and properties was the best.