Spall Fracture Patterns for the Heterophase Cu–Al–Ni Alloy in Ultrafine- and Coarse-Grained States Exposed to a Nanosecond Relativistic High-Current Electron Beam
A comparative study of spall fracture patterns for the heterophase Cu – 8.45% Al – 5.06% Ni alloy (аt.%) in ultrafine- and coarse-grained states under shock-wave loading using the “SINUS-7” electron accelerator is carried out. For electron energy of 1.4 MeV, pulse duration of 50 ns, and power density of 1.6·1010 W/cm2, the shock wave amplitude was 8 GPa and the strain rate was ~2·105 s–1. It is established that the thickness of the spalled layer increased for both grained structures, and the degree of plastic strain decreased with increasing target thickness. Based on experimental data obtained and results of theoretical calculations, it is demonstrated that the spall strength of ultrafine- and coarse-grained structures is ~3 GPa. The data on the grained structure at different distances from the spall surface and spall fraction patterns and mechanism are presented.
Keywordsheterophase alloy ultrafine-grained structure nanosecond electron beam shock wave spall fraction
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