【摘要】 镁及其合金因其轻质特性，在汽车、航空和航天等多个领域被广泛应用。电弧熔丝增材制造(WAAM)技术因其经济性、高沉积效率和高材料利用率而备受青睐。基于冷金属过渡(CMT)技术制备了WAAM AZ31镁合金单道薄壁构件。重点探讨了沉积参数对AZ31镁合金构件的成型性、组织和力学性能的影响。结果表明：电弧电流与沉积速度有一定的匹配性，也共同影响热输入，热输入过大或过小都会影响WAAM AZ31镁合金构件的成型质量；选择电弧电流为90 A、电压为12.3 V、送丝速度为6.2 m/min、沉积速度为7.5 mm/s的工艺参数，可以获得更细晶粒和更弱织构强度，同时展现最佳力学性能，具体为屈服强度约96 MPa、抗拉强度约201 MPa、伸长率约12%。更多还原

【Abstract】 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%.更多还原