Abstract Eutectic alloys offer great promises for additive manufacturing owing to an enhancement of mechanical properties due to ultra-fine eutectic microstructures. We study experimentally and numerically through phase-field simulations the Laser Powder-Bed Fusion processing of several near-eutectic Al Ni alloys. The large variations of cooling rate within the melt pool allow us to investigate the dependence of the selected microstructure on the concentration of the alloy and the solidification velocity. We find that a coupled zone, the temperature-dependent concentration interval within which the two-phase eutectic coupled growth takes place, that drifts towards higher concentrations when the solidification velocity increases. The phase-field simulations essentially support the experimental observations.

中文翻译：

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共晶铝镍合金的激光粉末床熔合：实验和相场研究

摘要 共晶合金由于超细共晶微观结构可提高机械性能，因此为增材制造提供了广阔的前景。我们通过相场模拟实验和数值研究了几种近共晶铝镍合金的激光粉末床熔融加工。熔池内冷却速度的巨大变化使我们能够研究所选微观结构对合金浓度和凝固速度的依赖性。我们发现耦合区，即发生两相共晶耦合生长的温度相关浓度区间，当凝固速度增加时，会向更高的浓度漂移。相场模拟基本上支持实验观察。