Abstract
In this paper, TC4 m/5A06Al composite was hypervelocity impacted by 2024 aluminium projectile with the diameter of 2 mm and with the impact velocity of 3.5 km/s. The residual microstructure was observed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HREM). The TC4–Al interface before impact was composed of TiAl 3 phase and Ti 3Al phase. Near the pithead, separation of TC4 fibers and Al matrix occurred along the impact direction. Around the middle of the crater, TC4 fibers were sheared into several sections. Near the bottom of crater, adiabatic shear band (ASB) occurred in TC4 fiber, while the angle between shear plane and cross section was 45°. The crack propagated along TC4–Ti 3Al interface during impact and some Ti 3Al phase at the TC4–Al interface transformed to amorphous with few nanocrystals after hypervelocity impact.
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