Abstract The thermal stability and crystallization mechanism of the Zr59.3Cu28.8Al10.4Nb1.5 (at%) metallic glass produced through selective laser melting SLM (from industrial grade material) was studied and compared with the same alloy produced by suction casting (from laboratory grade material of high purity). Oxygen- and Al-rich particles of a cubic phase (Fd 3 ‾ m) with a size of up to 200 nm are detected in the as-built selective laser melted samples by transmission electron microscopy. The crystallization process of the cast and SLM samples is investigated by in-situ X-ray diffraction experiments. In the cast samples, the initial crystallization occurs via the formation of a metastable tetragonal phase (Al2Zr3), together with tetragonal CuZr2 and hexagonal Al3Zr4 type structures, while the SLM samples initially crystallize through the formation of the metastable, oxygen- and Al-rich, cubic phase already present before annealing. The main phases present at the end of the crystallization for both type of samples are the same, mainly CuZr2 and Al3Zr4. The differences in the crystallization paths are attributed to differences in the oxygen levels. In general, the higher oxygen content (∼1 at%) of the SLM samples results in a decrease of the thermal stability of the alloy and promotes the formation of an oxygen-rich, metastable cubic phase.

中文翻译：

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吸铸和选择性激光熔化制备的 Zr 基金属玻璃的热稳定性和结晶

摘要 研究了通过选择性激光熔化 SLM（来自工业级材料）生产的 Zr59.3Cu28.8Al10.4Nb1.5（at%）金属玻璃的热稳定性和结晶机制，并与通过抽吸铸造生产的相同合金（来自工业级材料）进行了比较。高纯度的实验室级材料）。通过透射电子显微镜在建成的选择性激光熔化样品中检测到尺寸高达 200 nm 的立方相 (Fd 3 ‾ m) 富氧和富铝颗粒。通过原位 X 射线衍射实验研究了铸件和 SLM 样品的结晶过程。在铸造样品中，初始结晶是通过形成亚稳态四方相 (Al2Zr3) 以及四方 CuZr2 和六方 Al3Zr4 型结构而发生的，而 SLM 样品最初是通过形成亚稳态、富含氧和铝的立方相在退火之前已经存在而结晶的。两种样品在结晶结束时的主要相是相同的，主要是 CuZr2 和 Al3Zr4。结晶路径的差异归因于氧含量的差异。一般来说，SLM 样品中较高的氧含量（~1at%）会导致合金的热稳定性降低，并促进富氧亚稳立方相的形成。结晶路径的差异归因于氧含量的差异。一般来说，SLM 样品中较高的氧含量（~1at%）会导致合金的热稳定性降低，并促进富氧亚稳立方相的形成。结晶路径的差异归因于氧含量的差异。一般来说，SLM 样品中较高的氧含量（~1at%）会导致合金的热稳定性降低，并促进富氧亚稳立方相的形成。