Evolution of Microstructure, Texture and Corrosion Properties of Additively Manufactured AlSi10Mg Alloy Subjected to Equal Channel Angular Pressing (ECAP)

In the selective laser melting process (SLM), region irradiated by beam is melted and quickly solidified, forming solidification lines (laser scan tracks) with symmetrical shapes. Because of unique (rapid) crystallization conditions, subgrain structures, typically observed inside these lines, could also have variable geometric patterns, e.g., cellular, pentagonal, or hexagonal cellular. The existence such distinctive microstructures in SLM-made alloys has a significant impact on their superior mechanical corrosion properties. Thus, any modification this microstructure (due to post-processing) can degrade improve properties SLM-fabricated alloys. This study presents experimental results effects heat treatment ECAP behavior AlSi10Mg alloy. Light microscopy, scanning electron microscopy (SEM), backscattered diffraction (EBSD), X-ray (XRD) were used for microstructural analysis. given samples determined using open-circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) techniques. EBSD observations showed that imposed strain resulted an obvious reduction grain size ~1.42 µm ~0.24 after first second passes, respectively. Electrochemical tests revealed resistance ECAP-processed alloy improved significantly, which was confirmed nobler Ecorr lower Icorr values, higher polarization resistance. final indicated strain-induced crystalline defects provided more nucleation sites formation denser thicker oxide film, thus enhancing