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首页> 外文期刊>Materials science forum >Surface Morphology of Refractory Metals Submitted to a Single Laser Pulse
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Surface Morphology of Refractory Metals Submitted to a Single Laser Pulse

机译：难治金属的表面形态提交给单个激光脉冲

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摘要

The work investigates refractory metals (bulk W, W produced via plasma spraying, W-1% La_2O_3 and Mo) of interest as plasma facing materials in future nuclear fusion reactors. They have been irradiated by a single Nd:YAG laser pulse to simulate the effects of transient thermal loads of high energy occurring in a tokamak under operative conditions and then examined by SEM observations. In all the materials the laser pulse induces a crater in the central area of laser spot surrounded by a ridge due to movement of molten metal while in a more external area a network of cracks is observed. Diameter and depth of the crater, ablated volume and morphological features of the surrounding area exhibit differences depending on the specific metal, its physical and microstructural characteristics which affect vaporization, melting and heat propagation from the irradiated spot.
机译：该工作研究了未来核聚变反应堆中的血浆面向等离子体的耐火金属（通过等离子体喷涂，W-1％La_2O_3和Mo）的耐火金属（散装W，W-1％LA_2O_3和MO）。它们被单个Nd：YAG激光脉冲照射，以模拟在手术条件下在Tokamak中发生瞬态热负荷的影响，然后通过SEM观察检查。在所有材料中，激光脉冲引起在由熔融金属的运动中被脊架围绕的激光光斑的中央区域中的火山口，而在更多外部区域观察到裂缝网络。射击口的直径和深度，周围区域的烧蚀体积和形态特征，根据特定金属，其物理和微观结构特征影响蒸发，熔化和来自辐照斑点的热传播的差异。

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