Required microstructural attributes of an alloy vary with structural applications. The microstructural fine-tuning capability of laser-powder bed fusion (L-PBF) additive manufacturing (AM) enables application specific manufacture of the components. Such manufacture with L-PBF AM requires alloys that exhibit wide processing window and are amenable to multiple deformation mechanisms. However, high hot cracking susceptibility of Al alloys poses a barrier to such printability-performance synergy. In this work we show that an integration of, a) grain refinement through heterogeneous nucleation, and b) eutectic solidification, leads to crack-free parts at wide range of process parameters, microstructural heterogeneity, and hierarchy in the Al-Ni-Ti-Zr alloy. Such an integration targets hot cracking at multiple stages of solidification in L-PBF as opposed to the contemporary alloy design strategies that target hot-cracking at only specific stages of solidification. The Al-Ni-Ti-Zr alloy exhibits excellent printability and a high as-built tensile performance. Due to the wide processing window and amenability to multiple deformation mechanisms, the alloy microstructure and subsequently the performance, can be fine-tuned. Such strategy opens the gateway for application-specific manufacture of Al alloys with L-PBF AM and establishes a fundamental shift in current methodologies for design of these alloys for L-PBF AM.

合金所需的微结构属性随结构应用而变化。激光粉末床熔合（L-PBF）增材制造（AM）的微观结构微调功能可实现组件的特定应用制造。用L-PBF AM进行这种制造需要合金，该合金具有宽的加工范围，并具有多种变形机理。然而，铝合金的高热裂纹敏感性对这种可印刷性-性能协同作用构成障碍。在这项工作中，我们显示出以下方面的整合：a）通过非均相形核细化晶粒， b）共晶凝固导致在Al-Ni-Ti-Zr合金的广泛工艺参数，微观结构异质性和层级方面产生无裂纹的零件。这种集成针对的是L-PBF的多个凝固阶段的热裂，而现代合金设计策略只针对特定的凝固阶段的热裂。Al-Ni-Ti-Zr合金具有出色的适印性和较高的拉伸抗拉性能。由于宽阔的加工窗口和对多种变形机制的适应性，可以对合金的微观结构以及随后的性能进行微调。这种策略为使用L-PBF AM的铝合金的专用制造打开了门户，并为当前用于L-PBF AM的铝合金的设计方法建立了根本性的转变。