Hydrogen removal from particle-reinforced Al composite is critical for preventing porosities near particle clusters and improving comprehensive material properties. This study investigated the effects of different argon flow schemes and power ultrasound on bubble dispersion in water. Based on similarity theory, the optimal argon flow scheme for ultrasonic-assisted argon (UAA) treatment was identified and applied to TiB2/2024 Al composite to explore the degassing mechanism. Three argon flow schemes for UAA treatment: EV-EC (External ventilation, equal channel), IV-EC (Internal ventilation, equal channel), and IV-RC (Internal ventilation, reduced channel) were evaluated through numerical simulation and water simulation experiments. The results demonstrated that IV-RC scheme exhibits superior bubble dispersion characteristics and a broader bubbling range. Experimental results in Al composite confirmed that UAA treatment with IV-RC scheme achieved the highest degassing efficiency, with a relative density improvement of up to 98.01 % and the lowest hydrogen content (0.0235 ppm). Synchrotron radiation X-ray computed tomography results indicated that UAA treatment effectively reduces the pore size and volume, transforming interconnected, complex pores into dispersed, nearly spherical ones. Ultrasonic cavitation aids this process by breaking small argon bubbles into numerous tiny bubbles that penetrate deeply into the melt, reducing the wettability angle between particles and the matrix and thereby improving hydrogen removal efficiency.

中文翻译：

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优化颗粒增强 Al 复合材料的脱气：先进的超声辅助氩处理和数值模拟见解


从颗粒增强 Al 复合材料中去除氢对于防止颗粒簇附近出现孔隙和改善材料综合性能至关重要。本研究调查了不同氩流方案和功率超声对水中气泡扩散的影响。基于相似性理论，确定了超声辅助氩 （UAA） 处理的最佳氩流方案，并将其应用于 TiB2/2024 Al 复合材料，以探究脱气机理。通过数值模拟和水模拟实验评估了 UAA 治疗的三种氩流方案：EV-EC （外部通气，等通道）、IV-EC （内部通气，等通道） 和 IV-RC （内部通气，减少通道）。结果表明，IV-RC 方案表现出优异的气泡分散特性和更宽的鼓泡范围。Al 复合材料的实验结果证实，IV-RC 方案的 UAA 处理实现了最高的脱气效率，相对密度提高了高达 98.01 %，氢含量最低 （0.0235 ppm）。同步辐射 X 射线计算机断层扫描结果表明，UAA 处理有效减小了孔径和体积，将相互连接的复杂孔转变为分散的近乎球形的孔。超声波空化通过将小氩气泡分解成许多深入熔体的微小气泡来辅助这一过程，减小颗粒与基质之间的润湿角，从而提高脱氢效率。