Abstract Rapid solidification of the intermetallic Ni3Sn compound from an undercooled liquid was investigated using time-resolved synchrotron X-ray diffraction. Primary growth of an ordered and a disordered cubic solid was observed in situ at a low and a high undercooling, respectively. The disordered cubic solid was reordered after rapid solidification and experienced a solid-state transformation in cooling. A HRTEM study revealed high density of crystal defects and nanodomains in the transformed matrix. A HAADF-STEM study determined that the nanodomains are antiphase domains with chemical disorder. These observations indicated a possibility of online control of mechanical properties in additively manufactured intermetallics.

中文翻译：

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Ni3Sn 中反相纳米域的无序捕获和形成：原位观察和高分辨率表征

摘要 使用时间分辨同步加速器 X 射线衍射研究了金属间 Ni3Sn 化合物从过冷液体中的快速凝固。分别在低过冷度和高过冷度下原位观察到有序和无序立方体的初级生长。无序立方体在快速凝固后重新排列，并在冷却过程中发生固态转变。HRTEM 研究揭示了转化基质中的高密度晶体缺陷和纳米域。HAADF-STEM 研究确定纳米域是具有化学无序的反相域。这些观察结果表明在线控制增材制造的金属间化合物的机械性能的可能性。