Abstract
Aluminum alloys have become prominent materials for additive manufacturing (AM) owing to their high specific strength and the opportunities provided by AM for fabricating parts with complex geometries. Many efforts have been devoted recently to developing novel high-strength aluminum alloys compatible with AM processes. However, the fatigue performance of these alloys needs to be thoroughly understood before being deployed in critical load-bearing applications. It is well known that build orientation affects the microstructure and defects of the AM parts, which then dictates their fatigue performance. Accordingly, this study investigates the fatigue behavior of Scalmalloy (Al-Sc-Zr) in different build orientations fabricated via laser beam powder bed fusion (LB-PBF) AM process. The anisotropy in fatigue behavior and failure mechanisms associated with the variation in micro-/defect-structure of LB-PBF Scalmalloy are addressed and discussed.
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