Li Hengfu, Yu Zhenyu, Rong Peng, Wu Yi, Hui Xulong, Zhang Fengguo, Chen Zhe, Wang Haowei
State Key Laboratary of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
Chengdu Aircraft Industry (Group) Co. Ltd, Chengdu 610091, China.
Materials (Basel). 2021 Jan 7;14(2):258. doi: 10.3390/ma14020258.
The high strain rate deformation behavior and microstructure evolution of in situ TiB particle reinforced Al-Zn-Mg-Cu composite were investigated by means of Taylor impact. The dynamic tests were performed at three different impact velocities. Under three different velocities, no obvious shear failure occurred in the composite, indicating a good impact resistance. Compared to the quasi-static compression test, the dynamic yield strength increased obviously with the rise of velocity, even more than 1 GPa. The dislocation multiplication, phonon drag effect and ceramic reinforcement increased the flow stress of composite. Fine, equiaxed grain structure developed after impact, resulting from grain fragmentation or dynamic recrystallization. Finite element simulation of Taylor impact was qualitatively in agreement with the experiments, which was useful to elucidate the formation of equiaxed grain structure.
通过泰勒撞击试验研究了原位TiB颗粒增强Al-Zn-Mg-Cu复合材料的高应变速率变形行为和微观结构演变。动态试验在三种不同的撞击速度下进行。在三种不同速度下，复合材料中未出现明显的剪切破坏，表明其具有良好的抗冲击性。与准静态压缩试验相比，动态屈服强度随着速度的增加而明显提高，甚至超过1 GPa。位错增殖、声子拖拽效应和陶瓷增强相提高了复合材料的流动应力。撞击后形成了细小的等轴晶粒结构，这是由晶粒破碎或动态再结晶导致的。泰勒撞击的有限元模拟与实验结果在定性上一致，这有助于阐明等轴晶粒结构的形成。
