【摘要】 利用化爆驱动飞片对铅 锡和铜 铝的颗粒混合物进行冲击加载。回收样品的金相分析发现,在锡颗粒边界有明显的铅锡质量混合带,带宽约60～80μm。利用扫描电镜对混合带进行点扫描,得到带内铅和锡质量分布。计算出的铅锡动态扩散系数为D=0.9cm2/s,远高于准静态。利用离散元方法进行了数值模拟,定性的显示了高速冲击下材料细观混合的过程和机理。更多还原

【Abstract】 Tin and lead beads are chosen to conduct the high velocity impact experiments with an explosive plane wave generator.The impact velocity is about 2 km/s.A metallurgic picture of the recovered specimen shows that there are four bands along the interfaces between tin and lead.The width across the bands is about 60～80 μm.The SEM examination discloses that these bands are the mass mixing regions of tin and lead.The dynamic diffusion coefficient of the experiments is 0.9 cm~2/s,which is much higher than that at quasi-static case. A discrete element simulation (DEM) demonstrates the process and mechanisms of the observed mass mixing for Pb-Sn beads under shock loading at meso-scale qualitatively.更多还原