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以Al-6.3Cu和Al-5Mg为填丝材料进行铝合金双丝VP-GTAW增材制造试验。结果表明,采用双丝VP-GTAW制备试样可提高成形效率,且成形稳定;通过调节2种丝材的送丝速度可以获得不同主要合金元素含量的Al-Cu-Mg合金,合金组织主要由柱状晶和等轴枝晶组成,且呈非均匀分布特征,调节主要合金元素含量可实现对铝合金试样性能的控制。原始状态下铝合金试样的显微硬度(HV)为900~1000 MPa,抗拉、屈服强度分别可达286和183 MPa,但塑性较差,仅为4.5%。
Al-6.3Cu and Al-5Mg as filler material for double-wire aluminum alloy VP-GTAW additive manufacturing test. The results show that the preparation efficiency of double-wire VP-GTAW can increase the forming efficiency and the forming stability. The Al-Cu-Mg alloy with different main alloying elements can be obtained by adjusting the wire feeding speed of two kinds of wires. Columnar crystals and equiaxed dendrites, and non-uniform distribution of the characteristics of the main alloy elements can be adjusted to achieve the performance of aluminum alloy sample control. The microhardness (HV) of the as-cast aluminum alloy specimen was 900-1000 MPa, tensile strength and yield strength were 286 and 183 MPa respectively, but the plasticity was only 4.5%.