Formation and evolution of shear bands in Zr₄₀Ti₆₀ alloy impacted by Hopkinson bar

Abstract

Shear band formation and evolution in Zr 40 Ti 60 alloy impacted by split Hopkinson pressure bar at different strain rates were investigated. The critical compression strain for the initiation of the shear band was about 15%, and almost no changes were observed with increasing strain rate. The microstructure of the shear band with a width of 13 mm was characterised with elongated and broken grains. Moreover, nanosized dynamic recrystallisation grains (50-100 nm) were observed at the centre of the shear band with widths of 41 and 68 mm. In addition, the microhardness at the centre of the shear band decreased from 560 to 410 HV when the shear band width increased from 13 to 68 mm.

Effect of surface electroplating on fragment deformation behavior subjected to contact explosion

“…The presence of the lining could increase the pulse width and reduce the deformation speed of the shock wave [18], but this would affect the initial velocity and terminal effect [19]. The mechanical properties could be improved via composition or microstructure design [20][21][22][23][24]. These methods on the dynamic mechanical properties of the material could avoid fracture failure under explosion.…”