Microstructures and Mechanical Properties of Wire Arc Additive Manufacturing AZ31 Mg Alloy
Magnesium alloys as lightweight materials are widely used in automotive,aerospace and other industries.Wire Arc Additive Manufacturing(WAAM)has gained wide attention due to its low cost,high deposition efficiency and high material utilization.In this study,single-pass thin-wall AZ31 Mg alloy components were prepared by Cold Metal Transition(CMT)technology belonging to WAAM.The influences of deposition parameters on the formability,microstructures and mechanical properties of AZ31 Mg alloy components were analyzed.The results show that there is a specific correlation between welding current and deposition speed.At the same time,deposition parameters affect the heat input and thus the forming quality of AZ31 Mg alloy components.The AZ31 Mg alloy component,prepared by the welding current of 90 A,voltage of 12.3 V,wire feed speed of 6.2 m/min,deposition speed of 7.5 mm/s,exhibits smaller grains size and weaker texture.It also exhibits the best mechanical properties,namely,a yield strength of about 96 MPa,tensile strength of about 201 MPa and elongation of about 12％.
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