Strength and microstructure of friction stir welded additively manufactured Scalmalloy® in as-welded and heat-treated conditions

• DOI: 10.1016/j.jmapro.2023.04.051
• Publication Date: 2023-05-01T21:10:15Z
• Authors: Pietro Mirandola; Vincenzo Lunetto; David Novel; Mario Barozzi; Pierluigi Bellutti; Manuela De Maddis; Pasquale Russo Spena
• Keywords: Friction Stir Welding; Butt joint; Ductility (Earth science); Precipitation hardening; Hardening (computing)

This study investigates the feasibility of butt friction stir welding LPBF additively manufactured FSW Scalmalloy® plates, assessing microstructural and mechanical properties joints in as-welded heat-treated conditions. The heat treatment consisted age hardening to benefit from strengthening effect Al-Sc precipitates on joint strength. influence build direction additive layers microstructure performances has also been determined. results show that plates affects neither process nor welded joints. thoroughly modifies microstructures as-printed Scalmalloy®, eliminating intrinsic porosity associated with AM process. input causes precipitation phases so following aging a limited improving Although enhances strength hardness there is significant loss ductility (from 16 % 4 %), as pointed out by absence plastic deformation surface fracture tensile samples.