Effect of aging time on microstructure and mechanical properties of 2319 aluminum alloy fabricated by wire arc additive manufacturing was studied,and the fracture mechanism of tensile specimens was analyzed.The results indicate that with the prolongation of aging time,the number and size of precipitated phases in the alloy gradually increase.The precipitates are mainly Al2Cu phase,as well as Fe-and Mn-rich impurity phases.After aging,the tensile strength in horizontal direction of the alloy increases to 450 MPa,and the tensile strength in vertical direction reaches 350 MPa,but the elongation decreases.The aggregation of small pores,as well as the segregation ofθ(A12Cu)phase and Fe-and Mn-rich impurity phases along grain boundaries,result in the anisotropy of the alloy in both horizontal and vertical directions.At the same time,a large number of micro pores are distributed along the interlayer,and they aggregate and grow together,forming cracks that lead to the fracture and failure of the specimen.
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