Influence of Grain Structure Type on Spall Fracture Induced by a Nanosecond Relativistic High-Current Electron Beam in Ti–Al–V Alloy.

The results of experimental and theoretical research of shock-wave processes and spall fracture of heterophase Ti-Al-V alloy under the impact of nanosecond electron beam are reported. Features and structural-scale levels of spall fracture for structures with different grain size and type of grained structure have been investigated. It is established experimentally that plastic deformation precedes the spall fracture sequentially at three structural-scale levels. At the beginning pores are formed and merge, then microcracks are formed at different angles to the back surface of the target between the pores, and then a macrocrack is formed. [ABSTRACT FROM AUTHOR]