Abstract Cold spray (CS) as a new surface modification method is widely applied in improving surface quality. The effect of crystal orientation of powder particles on coating surface generation mechanisms in cold spray is systematically investigated by molecular dynamics (MD) simulations in this work. The amorphization tendency and temperature distribution in the jetting region in our simulation are consistent with previous experimental results. In particular, our results show that crystal orientation affects the interactions between the powder particles and the surface of the substrate dramatically, leading to different atomic stress distribution, dislocation density evolution and microstructure evolution processes in the particle/substrate interface region for powder particles with different crystal orientations. The coating surface generation mechanism related to the slip plane system will be discussed.

中文翻译：

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晶体取向效应对冷喷涂涂层表面生成机制的原子模拟

摘要 冷喷涂（CS）作为一种新型的表面改性方法，在提高表面质量方面得到了广泛的应用。在这项工作中，通过分子动力学 (MD) 模拟系统地研究了粉末颗粒的晶体取向对冷喷涂涂层表面生成机制的影响。我们模拟中喷射区域的非晶化趋势和温度分布与先前的实验结果一致。特别是，我们的结果表明，晶体取向显着影响粉末颗粒与基体表面之间的相互作用，导致不同的粉末颗粒在颗粒/基体界面区域的原子应力分布、位错密度演化和微观结构演化过程不同。晶体取向。