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研究Al-Sc和Al-Ti半无限靶材在高速弹体撞击下的动力学响应,弹体的撞击速度分别为0.8、1.0、1.2和1.5 km/s。结果表明:Al-Sc靶材具有更优异的抗高速撞击能力。研究发现,不同的显微组织结构,包括晶粒大小、基体中析出的沉淀相粒子,导致Al-Sc和Al-Ti合金具有不同的抗撞击能力。同时,讨论Al-Sc合金中的纳米级Al3Sc粒子的尺寸效应对抗撞击能力的影响。此外,通过数值模拟对高速撞击后弹坑形状/几何尺寸进行仿真,并与实验结果进行对比验证。仿真分析结果较准确地复现了实验结果,在此基础上通过外推的方法将弹体速度推广到超高速范畴(>5 km/s)进行分析。在超高速撞击作用下,弹坑表面发生熔化和凝固现象。
The dynamic responses of Al-Sc and Al-Ti semi-infinite targets under high-speed projectile impact were studied. The projectile impact velocities were 0.8, 1.0, 1.2 and 1.5 km / s, respectively. The results show that: Al-Sc target has more excellent high-speed impact resistance. It has been found that different microstructures, including grain size and precipitated phase precipitates in the matrix, result in different impact resistance of Al-Sc and Al-Ti alloys. At the same time, the effect of the size effect of nano-sized Al3Sc particles in Al-Sc alloy on impact resistance was discussed. In addition, the shape and geometry of the crater after high-speed impact are simulated by numerical simulation and compared with the experimental results. The results of the simulation analysis reproduce the experimental results more accurately, and based on this, the projectile velocity is extended to superhigh speed category (> 5 km / s) by extrapolation. Under the action of hypervelocity impact, the surface of crater melts and solidifies.