57. Metallographie Tagung 2023

The processing of high strength aluminium base alloys with powder based additive manufacturing techniques is still complicated. Alloys which are currently available are difficult to process or very costly. Within this work mechanical properties of additively manufactured eutectic alloys of the Al-Ni and Al-Ca systems are investigated for the first time. Alloys were manufactured crack free by laser powder bed fusion (LPBF) and laser metal deposition (LMD) with part densities > 99.9 %. For the binary AlNi7.5 alloy an average ultimate tensile strength of 484 MPa was determined at an elongation at failure of 5.4 % directly after processing via LPBF. The determined mechanical properties were continuously improved by addition of up to 2.0 wt. % copper. In this talk the microstructure of LPBF manufactured, LMD manufactured and cast eutectic alloys investigated by scanning electron microscopy are compared. The effect of the addition of copper in LPBF manufactured AlNi7.5 alloys was additionally investigated by transmission electron microscopy. Furthermore, the failure mechanisms after room temperature and high temperature mechanical testing investigated by light and scanning electron microscopy are shown.