High Strain Rate Response of In-Situ TiB2/7055 Composite by Taylor Impact

Materials

Xulong Hui¹  Peng Rong²  Zhenyu Yu²  Haowei Wang³  Fengguo Zhang³  Zhe Chen³  Yi Wu³  Hengfu Li³ 

[1] Aircraft Strength Research Institute of China, Xi’an 710065, China;Chengdu Aircraft Industry (Group) Co. Ltd, Chengdu 610091, China;State Key Laboratary of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;

关键词: particle reinforced aluminum matrix composite;    Taylor impact;    flow stress;    microstructure evolution;    finite element model;   

DOI  :  10.3390/ma14020258

来源: DOAJ

【 摘 要 】

The high strain rate deformation behavior and microstructure evolution of in situ TiB₂ 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.

【 授权许可】

Unknown