Abstract Amorphous alloys have great potential in industrial applications. However, metallurgical characteristics of those materials during laser welding are still unclear. In this research, pulsed Nd:YAG laser welding was performed on the β-Ti dendrite reinforced amorphous alloy plates. The microstructures of the welding joints were specially observed and analyzed. Results show that no metallurgical defects were found in the joints. There is no obvious heat affected zone between the fusion zone and base material. The microstructure in the fusion zone (FZ) consists of β-Ti grains and amorphous matrix. Due to the fast cooling speed and the shock effect from the laser pulse during welding, the spherical shape β-Ti grains in the FZ are in nanometer scales, which are much smaller than the dendrite β-Ti grains in the base materials (BM). Element distribution analysis showed that the Mo atoms trend to enter the β-Ti lattice to form a solid solution. Therefore, the Mo element has the similar distribution with the Ti element in the joint. The hardness in FZ is higher than that in BM.

中文翻译：

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脉冲激光焊接TiZrBeCuMo复合非晶合金接头的显微组织

摘要 非晶合金在工业应用中具有巨大的潜力。然而，这些材料在激光焊接过程中的冶金特性仍不清楚。本研究对β-Ti枝晶增强非晶合金板进行脉冲Nd:YAG激光焊接。对焊接接头的显微组织进行了专门的观察​​和分析。结果表明，在接头中没有发现冶金缺陷。熔合区与母材之间没有明显的热影响区。熔合区 (FZ) 中的显微组织由 β-Ti 晶粒和非晶基体组成。由于焊接过程中冷却速度快和激光脉冲的冲击作用，FZ中的球形β-Ti晶粒为纳米级，远小于母材（BM）中的枝晶β-Ti晶粒. 元素分布分析表明，Mo原子倾向于进入β-Ti晶格形成固溶体。因此，Mo元素在接头中与Ti元素具有相似的分布。FZ 中的硬度高于 BM 中的硬度。