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Jianzhou Long, Chi Zhou, Gang Wang, Shuai Zhang, Mengmeng Wang, Yuanpei Duan, Qingsong Pan, Zesheng You, Liang Song, and Zhourong Feng, Novel non-equilibrium partitioning model and a developed strong and ductile Al–7.5Mg–0.5Sc–0.3Zr–0.6Si alloy for selective laser melting, Int. J. Miner. Metall. Mater., 32(2025), No. 7, pp.1669-1680. https://doi.org/10.1007/s12613-024-3041-2
Jianzhou Long, Chi Zhou, Gang Wang, Shuai Zhang, Mengmeng Wang, Yuanpei Duan, Qingsong Pan, Zesheng You, Liang Song, and Zhourong Feng, Novel non-equilibrium partitioning model and a developed strong and ductile Al–7.5Mg–0.5Sc–0.3Zr–0.6Si alloy for selective laser melting, Int. J. Miner. Metall. Mater., 32(2025), No. 7, pp.1669-1680. https://doi.org/10.1007/s12613-024-3041-2
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新的非平衡分配合金设计模型及其开发的选区激光熔化高强塑性Al-7.5Mg-0.5Sc-0.3Zr-0.6Si 合金

摘要: 近年来，适用于选区激光熔化技术（SLM）的高强塑性铝合金及其设计方法是增材制造领域重点研究方向。本研究提出了一种适用于SLM的非平衡分配合金成分模型。模型通过考虑SLM过程高冷却速率引起的固液界面非平衡分配效应，量化镁、硅元素对Al–Mg–Si合金热裂纹的影响规律。依据模型，开发出Al–7.5Mg–0.5Sc–0.3Zr–0.6Si合金，其不仅完全避免了SLM中的热裂问题，而且实现了强度-塑性的协同提升，屈服强度达到 (412 ± 8) MPa的同时，均匀延伸率保持在(15.6±0.6)%。文章分析了高SLM高冷却速率下Mg、Si对热裂纹影响的物理机制，并建立了SLM Al–Mg–Si合金均匀延伸率和Si含量间的定量关系。非平衡分配成分设计模型及高强塑性Al–7.5Mg–0.5Sc–0.3Zr–0.6Si合金在高可靠性SLM铝合金构件制造方面具有良好应用前景。

 

Novel non-equilibrium partitioning model and a developed strong and ductile Al–7.5Mg–0.5Sc–0.3Zr–0.6Si alloy for selective laser melting

Abstract: Strong and ductile Al alloys and their suitable design strategy have long been desired in selective laser melting (SLM). This work reports a non-equilibrium partitioning model and a correspondingly designed Al–7.5Mg–0.5Sc–0.3Zr–0.6Si alloy. This model effectively quantifies the influence of Mg and Si on hot cracking in aluminum alloy by considering the non-equilibrium partitioning under high cooling rates in SLM. The designed Al–7.5Mg–0.5Sc–0.3Zr–0.6Si alloy exhibits no hot cracks and achieves a remarkably enhanced strength–ductility synergy (a yield strength of (412 ± 8) MPa and a uniform elongation of (15.6 ± 0.6)%), superior to previously reported Al–Mg–Sc–Zr and Al–Mn alloys. A tensile cracking model is proposed to explore the origin of the improved ductility. Both the non-equilibrium partitioning model and the novel Al–7.5Mg–0.5Sc–0.3Zr–0.6Si alloy offers a promising opportunity for producing highly reliable aluminum parts through SLM.

 

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