Abstract
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.
Highlights
State Key Laboratary of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China; These authors contributed to this work and should be considered as co-first authors
Particulate-reinforced aluminum matrix composites (PRAMCs) have attracted attention due to their high strength, elastic modulus, hardness and good wear resistance compared with aluminum alloys [1,2]
Intensive studies have focused on the mechanical behavior [8,9,10,11,12], microstructure evolution [13,14,15,16] and failure behavior [17,18,19] of alloys and composites under high strain rate by means of medium and high strain rate tension, Hopkinson bar, Taylor impact and finite element simulation [20,21,22,23,24]
Summary
State Key Laboratary of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China; These authors contributed to this work and should be considered as co-first authors. 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. Intensive studies have focused on the mechanical behavior [8,9,10,11,12], microstructure evolution [13,14,15,16] and failure behavior [17,18,19] of alloys and composites under high strain rate by means of medium and high strain rate tension, Hopkinson bar, Taylor impact and finite element simulation [20,21,22,23,24]. Acosta et al [20] developed a reliable
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