Structure and Mechanical Properties of a Selective Laser Melted Al–6.7Mg–0.3Sc–0.25Zr Alloy

Abstract—The structure and mechanical properties (under static and fatigue loading) of Al–6.7Mg–0.3Sc–0.25Zr alloy samples synthesized by selective laser melting (SLM) horizontally and vertically relative to a build platform and subsequently aged at 360°C for 5 h are studied. The density of the synthesized samples is found to be maximal (99.88%) at a laser power of 800 W and a scanning speed of 1500 mm/s. The mechanical properties of such samples are almost independent of the build direction and are as follows: the ultimate tensile strength is σu = 420–430 MPa; the relative elongation, δ = 5–8%; and the fatigue limit, σR = 130–140 MPa.