Abstract
In this present study, single-wire and double-wire Al–Cu–Sn alloy walls were fabricated by an arc additive manufacturing process. The surface morphology, elemental composition, and microstructure were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM) techniques. The mechanical properties of both the single-wire and double-wire walls were studied by mechanical property testing. The results showed that the heat input of the double-wire wall was lower than that of the single-wire wall at the same wire feeding speed. The surface microstructure of the double-wire wall showed a more uniform surface than the single-wire wall. The grains of the double-wire wall were found to be isometric crystals in the as-deposited state. The θ phase of the double-wire wall was dispersed with a smaller grain size in the grain boundary. After T6 heat treatment, the θ phase of the double-wire wall was completely dissolved into the aluminum matrix, and a large amount of θ’ enhanced phases were precipitated with a phase spacing of about 15 nm. The mechanical properties of the double-wire wall were shown to have significantly improved performance, which further increased to 490 MPa, 420 MPa, and 12%, respectively. The transverse and longitudinal mechanical properties of the double-wire wall were consistent, and the fracture mode of both was ductile fracture.
Highlights
Al–Cu alloys are widely used in aviation and aerospace fields as they offer excellent mechanical properties compared to conventional alloys [1,2,3]
A comparison with the single-wire cold metal transfer (CMT) was conducted, which laid a foundation for the industrial application of CMT Twin technology of Al–Cu alloy produced by wire arc additive manufacturing (WAAM)
It can be seen seen from this figure that the of both processes present a silver-white metallic luster and from this figure that the surface of both processes present a silver-white metallic luster and periodic periodic concave and convex contour caused by layer-by-layer accumulation
Summary
Al–Cu alloys are widely used in aviation and aerospace fields as they offer excellent mechanical properties compared to conventional alloys [1,2,3]. Investigated the effect of solid solution temperature on the performance of a 2024 alloy wall These studies showed that the wall of Al–Cu alloy has excellent microstructural properties and has broad prospects for industrial application. All the above studies formed walls through a single of 10 wire process without considering the influence of heat input on the structure and performance. Twin considering is a welding the process developed the Fronius companyand (Pettenbach, Austria), process without influence of heatby input on the structure performance It has the characteristics of low heat input, high cladding was one ofCMT the important affecting the forming and performance of WAAM walls. Used technology to additive weld 1561 aluminum alloy, which effectively controlled [5,7], but theofeffect of this process on the microstructure properties of walls, and the research on the problem heat-affected zones and joint softening. For the industrial application of CMT Twin technology of Al–Cu alloy produced by WAAM
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