ABSTRACT

Cu-W_70-90 (wt.%) alloys were prepared by infiltration method, and the laser ablation experiments were conducted. The laser ablation resistance mechanism of Cu-W alloy was revealed with the guidance of the mathematic model coupling heat and fluid flow. By comprehensively analysing the calculation and the experimental results, the laser spot generated giant heat which will vaporise and melt the alloy respectively close to and away from the centre of the laser spot. The vaporisation of the alloy and the temperature gradient opposite to the laser propagation direction will significantly affect the flow field and make the molten alloy splash around. It was also quantitively proven that the W-rich phases with a high melting point can significantly increase the ablation resistance of Cu-W alloy by decreasing the ablation depth. The calculation results present a relatively high accuracy, this work will thus contribute to the application of the mathematic models in the laser processing field.

摘要

铜钨_70-90采用熔渗法制备了(wt.%)合金，并进行了激光烧蚀实验。以热流耦合数学模型为指导，揭示了Cu-W合金的抗激光烧蚀机理。综合计算和实验结果分析，激光光斑产生巨大热量，分别使靠近激光光斑中心和远离激光光斑中心的合金汽化和熔化。合金的汽化和与激光传播方向相反的温度梯度会显着影响流场并使熔融合金四处飞溅。定量证明，高熔点富W相可以通过降低烧蚀深度来显着提高Cu-W合金的抗烧蚀能力。