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Experimental and smoothed particle hydrodynamics analysis of interfacial bonding between aluminum powder particles and aluminum substrate by cold spray technique

机译:冷喷涂技术铝粉颗粒与铝基基材界面粘合的实验和平滑粒子流体动力学分析

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摘要

This study aims on the dominant bonding mechanism between aluminum powder particles and aluminum substrate evaluated both experimentally and numerically. Aluminum particles were deposited at different velocities onto an aluminum substrate by cold spray (CS) technology. The crater, bond, and interface morphology upon impact were characterized using scanning electron microscopy, focused ion beam processing, and transmission electron microscopy. Experimental results reveal that rebound phenomenon existed at high velocities and excellent contact is obtained above the critical velocity. This denotes that ideal deposition occurs at a certain particle velocity scale. Meanwhile, the numerical analysis was performed via smoothed particle hydrodynamics (SPH) method. The simulated particle deformation behavior agreed well with the experimentally evaluated impact morphology, which confirms the viability of the SPH procedure for CS simulation. Furthermore, the numerically calculated deposition range was in correspondence with the experimental findings. The analysis demonstrates that interfacial bonding between the powder particles and substrate is influenced by the adhesive intersurface forces of the contacting surfaces.
机译:本研究旨在实验和数值评估铝粉颗粒和铝基衬底之间的主导粘接机制。通过冷喷雾(CS)技术将铝颗粒沉积在不同的速度上。使用扫描电子显微镜,聚焦离子束处理和透射电子显微镜的撞击率,键和界面形态的特征在于。实验结果表明,在临界速度高于高速下存在的反弹现象和优异的接触。这表示理想的沉积在某种颗粒速度尺度上发生。同时,通过平滑粒子流体动力学(SPH)方法进行数值分析。模拟颗粒变形行为与实验评估的影响形态吻合良好,这证实了SPH程序对CS仿真的可行性。此外,数值计算的沉积范围与实验结果相对应。该分析表明,粉末颗粒和衬底之间的界面键合受接触表面的粘合性交叉的影响。

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