The application of additively manufactured high strength aluminium base alloys is, among others limited due to either a lack in processability or economic feasibility with the alloys currently available. Within this work, the mechanical properties of additively manufactured eutectic Al-Ni alloys are investigated for the first time. With an average ultimate tensile strength of 545 MPa at an elongation at failure of 10.1 %, Al-7.5 wt. % Ni2.0 wt. % Cu (AlNi7.5Cu2.0) is the first aluminium base alloy known to the authors that has been processed with Laser Powder Bed Fusion (LPBF) and surpasses an ultimate tensile strength of 500 MPa and an elongation at failure of 10 % while relying on economically feasible alloying strategies and elements (i.e. no addition of rare earth elements, such as Sc). The properties of the alloys investigated are assumed to be a consequence of the α-aluminium- and intermetallic Al₃Ni-phase comprising the eutectic in combination with an ultrafine interlamellar spacing as a result of the cooling rates utilized in the LPBF process. The specific alloy compositions investigated in this work are Al-7.5 wt. % Ni (AlNi7.5), Al-7.5 wt. % Ni-0.5 wt. % Cu (AlNi7.5Cu0.5) and AlNi7.5Cu2.0. All alloys were manufactured crack free by LPBF 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 % in the additively manufactured condition. The determined mechanical properties were continuously increased by addition of up to 2.0 wt. % copper.

由于目前可用的合金缺乏可加工性或经济可行性，增材制造的高强度铝基合金的应用受到限制。在这项工作中，首次研究了增材制造的共晶 Al-Ni 合金的机械性能。平均极限拉伸强度为 545 MPa，断裂伸长率为 10.1 %，Al-7.5 wt. % Ni2.0 wt. % Cu (AlNi7.5Cu2.0) 是作者已知的第一种采用激光粉末床融合 (LPBF) 处理并超过 500 MPa 的极限拉伸强度和 10 % 的断裂伸长率的铝基合金，同时依靠关于经济可行的合金化策略和元素（即不添加稀土元素，如 Sc）。₃ Ni 相包含低共熔体和超细层间间距，这是 LPBF 工艺中使用的冷却速率的结果。在这项工作中研究的特定合金成分是 Al-7.5 wt。% Ni (AlNi7.5), Al-7.5 wt. % Ni-0.5 wt. % Cu (AlNi7.5Cu0.5) 和 AlNi7.5Cu2.0。所有合金均通过 LPBF 无裂纹制造，零件密度 > 99.9 %。对于二元 AlNi7.5 合金，在增材制造条件下，在 5.4% 的断裂伸长率下测得的平均极限抗拉强度为 484 MPa。通过添加至多 2.0 重量％，确定的机械性能不断提高。％ 铜。