Investigation of the overlapping coefficient impact on the structure and mechanical properties of Al-Mg alloy obtained by wire arc additive manufacturing

Abstract

The work is devoted to the study of structural features and mechanical properties of thick-walled samples of Al-Mg alloy got by direct arc growth. This method has attracted particular attention in recent decades, mainly because of its high productivity and low cost. The high productivity of the process makes the wire arc additive manufacturing technology suitable for the production of large wall thicknesses. It is possible to achieve the correct formation of thick-walled elements and to get the specified dimensions by changing the overlap coefficient. It is important to consider that changes in the overlapping coefficient led to changes in size, morphology, as well as the intermetallic distribution, which will affect the mechanical behavior of the samples. The paper considers the features of grain structure formation, phase intermetallic components and their influence on the mechanical properties of thick-walled samples got at different overlapping coefficients. Two types of intermetallic compounds Mg₂Si and Al₆(Fe, Mn) were identified in the sample. Their size and morphology differ in relation to the overlap coefficient. As a result, the samples demonstrate anisotropy of mechanical properties. The highest values of tensile strength, yield strength and elongation obtained at 0.4 overlapping coefficient and were 319 MPa, 150 MPa and 16.1 %, respectively.

Keywords

aluminum alloys / additive manufacture / wire arc additive manufacturing / thick walls / phase composition / mechanical properties

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