The influence of second-phase boron particles (up to 0.15 wt%) on impact response of aluminum is investigated under high strain rate gas gun loading. The Hugoniot elastic limit ($\sim$0.11 GPa) shows a negligible dependence on boron particle content up to 0.15 wt%. The second-phase particles reduce considerably spall strength of aluminum, and such reduction is more pronounced at high boron content. Spall strength undergoes a slight decrease at high impact velocities. Scanning electron microscopy and synchrotron X-ray computed tomography analyses indicate a competition between microvoid nucleation and microvoid growth. The damage features and spall strength characteristics can be attributed to the weak particle–matrix interface.

在高应变率气枪载荷下，研究了第二相硼颗粒（最高0.15 wt％）对铝冲击响应的影响。Hugoniot弹性极限（$〜$0.11 GPa）对高达0.15 wt％的硼颗粒含量的影响可忽略不计。第二相颗粒显着降低了铝的剥落强度，并且这种降低在高硼含量下更加明显。在高冲击速度下，剥落强度会略有下降。扫描电子显微镜和同步加速器X射线计算机断层扫描分析表明，微孔成核和微孔生长之间存在竞争。损伤特征和剥落强度特征可归因于弱的颗粒-基体界面。