Abstract
In this experiment, Al-Cu-Sn alloy was used as raw material to form deposits with different heat input using the wire-arc additive manufacturing (WAAM) process. The effects of heat input on microstructure and mechanical properties of Al-Cu-Sn alloy deposits were investigated by metallography, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM) and mechanical properties tests. The results show that with increased of heat input, the thickness of the deposits increased and the layer height of the deposits increased. The number and size of pores in the deposits also improved with the increased heat input. The grain size of the deposits in the as-deposited state gradually increased and changed from isometric crystals to columnar crystals, the precipitated θ phases gradually converged on the grain boundary from within the grains. After T6 heat treatment, with increased heat input, the number of unsolved θ phases on the grain boundary increased, and the number of θ phases precipitated out of the matrix decreased as the phase spacing increased. With the increased heat input, the mechanical properties of the deposits gradually decreased, and the fracture mode changed from ductile fracture to brittle fracture.
Highlights
Due to their excellent mechanical properties, Al-Cu alloys are widely used in the aviation and aerospace fields [1,2,3]
Wang et al [8] investigated the structure and properties of ZL205A alloy wall deposited by the wire + arc additive manufacturing process
The above studies show that the wire-arc additive manufacturing (WAAM) Al-Cu alloy deposits have excellent microstructure and properties, and have a broad potential for industrial application
Summary
Due to their excellent mechanical properties, Al-Cu alloys are widely used in the aviation and aerospace fields [1,2,3]. Wang et al [8] investigated the structure and properties of ZL205A alloy wall deposited by the wire + arc additive manufacturing process. The above studies show that the WAAM Al-Cu alloy deposits have excellent microstructure and properties, and have a broad potential for industrial application. At present, research on WAAM Al-Cu alloy mainly focuses on finding suitable raw materials, and there are few systematic studies on the influence of additive process on microstructure and properties, which has a significant effect on the industrial application of this technology. We investigate the effects of heat input on the forming size, structure and properties of the deposits, to explore the appropriate process window of WAAM Al-Cu-Sn alloy, paving the way for the industrial application of WAAM process
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