School of Materials Science and Engineering, Harbin Institute of Technology, No. 92 West Da-Zhi Street, Harbin 150001, China.
Micron. 2012 Feb;43(2-3):201-4. doi: 10.1016/j.micron.2011.07.013. Epub 2011 Jul 23.
In this paper, TC4(m)/5A06Al composite was hypervelocity impacted by 2024 aluminium projectile with the diameter of 2mm 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(3)Al 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(3)Al interface during impact and some Ti(3)Al phase at the TC4-Al interface transformed to amorphous with few nanocrystals after hypervelocity impact.
本文采用直径 2mm 的 2024 铝合金弹丸以 3.5km/s 的速度对 TC4(m)/5A06Al 复合材料进行了高速撞击实验。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和高分辨率透射电子显微镜（HREM）对残余微观结构进行了观察。撞击前 TC4-Al 界面由 TiAl(3)相和 Ti(3)Al 相组成。在近弹坑头部处，TC4 纤维和 Al 基体沿撞击方向发生分离。在坑中部附近，TC4 纤维被剪切为几段。在坑底部附近，TC4 纤维中发生绝热剪切带（ASB），剪切面与横截面之间的夹角为 45°。在撞击过程中，裂纹沿 TC4-Ti(3)Al 界面扩展，撞击后 TC4-Al 界面处的部分 Ti(3)Al 相转变成非晶态，同时伴有少量纳米晶。
