Using the calculation of phase diagrams approach and Scheil solidification modeling, the Al-2.5Mg-1.0Ni-0.4Sc-0.1Zr alloy was designed, intentionally with an extraordinarily high cracking susceptibility, making it prime for solidification cracking during laser powder bed fusion. This study demonstrates the ability to mitigate even the most extreme solidification cracking tendencies in aluminum alloys with only minor alloying additions of Sc and Zr, 0.5 wt.% max. Furthermore, by employing a simple direct ageing heat treatment, good tensile mechanical properties were observed with a yield strength of 308 MPa, an ultimate tensile strength of 390 MPa, and a total elongation of 11%.

使用相图计算方法和 Scheil 凝固模型，Al-2.5Mg-1.0Ni-0.4Sc-0.1Zr 合金被设计为具有极高的开裂敏感性，使其成为激光粉末床熔融过程中凝固开裂的主要材料。该研究表明，即使仅添加少量 Sc 和 Zr（最大 0.5 wt.%）合金元素，也能减轻铝合金中最极端的凝固开裂趋势。此外，通过采用简单的直接时效热处理，观察到良好的拉伸力学性能，屈服强度为 308 MPa，极限拉伸强度为 390 MPa，总伸长率为 11%。