ABSTRACT
Static properties, microstructure and fracture morphologies of a near-eutectic aluminium alloy produced by a laser additive manufacturing (LAM) method were investigated. Laser powder bed fusion process was used to 3D-print tensile test specimens at 0, 30, 60 and 90-degree build angle orientations, with known processing parameters. Tensile tests were conducted on MTS Landmark servo hydraulic Test System. Optical microscope (Leica DM750P with Leica application suite software) was used to determine the microstructures. SEM-LEO 1430 VP model was utilized to investigate the fracture surface features. Similarities and differences were present in the test results for mechanical properties. Namely, ultimate tensile strength, and elastic modulus for the LAM samples were found to be on par with that of a wrought aluminium alloy. In contrast, there was a distinct difference in yield for the wrought versus LAM. There were also differences in percent elongation as a function of build orientation and LAM versus wrought specimens. Distinct microstructures were observed that consisted of ripples, pores, voids, and cellular structure. Fracture characteristics demonstrated dimple fracture surface features demonstrating a good level of toughness.
