入射角对低能氙离子冲击下铝表面变形特性的影响
Incident-angle dependence of deformation characteristics of aluminum surface under low-energy xenon-ion impact
摘要：
离子推力器是一项具有广阔应用前景的革命性技术，但其工作寿命受到推力器部件溅射的限制。利用分子动力学模拟方法研究了低能氙离子轰击铝表面时铝表面的变形特性与入射角和动能的关系。非12配位原子的分数被用来定量表征微观结构的演变和缺陷密度水平。结果表明，缺陷密度水平与入射能量呈线性关系，在20 °附近存在一个临界入射角，此时铝表面缺陷密度水平最大。此外，一个碰撞模型的发展，从理论上揭示了背后的依赖性的物理机制。研究结果对开发具有实际应用价值的长续航力电力推进装置具有一定的指导意义。
英文摘要：
Ion thruster is a revolution technology with potential applications in space mission but the thrusters operation lifetime is limited by the sputtering from thruster components. In this work, molecular dynamic simulations are performed to explore the dependence of deformation characteristics of an aluminum surface on incident angle and kinetic energy under low-energy xenon-ion impact. The fraction of non-12-coordinated atoms is used to quantitatively characterize the microstructural evolution and defect density levels. It is found that defect density level has a linear relation with incident energy, and there exists a critical incident angle around 20 degrees, at which the aluminum surface has the maximum defect density level. In addition, a collision model is developed to theoretically reveal the physical mechanisms behind the dependence. Our findings may helpful in developing long endurance electric propulsion devices for practical applications.
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