强流脉冲离子束表面改性奥氏体不锈钢分子动力学的研究

The Molecular Dynamics Study on Surface Modification of Austenitic Stainless Steel by High Ions Puls Beam

用分子动力学方法(MD)研究了高能离子束辐照奥氏体不锈钢表面,并采用热尖峰模型模拟了辐照条件下的能量传递过程。通过对能量分布和原子运动的分析,确定了能量消耗的机理:一部分能量通过蒸发和热传导被表面的原子消耗,另一部分以激波的形式在基体中传播。热传导缓慢造成的高强度蒸发和表面原子的再吸附共同作用,导致了表面的光滑过程。

The surface of austenitic stainless steel irradiated by energetic beams was studied by molecular dynamics (MD). Thermal spike model was used to simulate the energy transferring process under irradiation. By analyzing the energy distribution and the atomic motion, the mechanism of energy consumption was determined. One part of energy was consumed by the atoms on the surface through evaporation and heat conduction. The other part transferred deep inside the matrix in shock wave form. The smooth process of surface resulted from the decrease of the evaporation strength and the readsorption processing.