Abstract
The effects of shock loading on the mechanical properties and microstructure of a precipitation hardening copper 1.91 wt pct beryllium alloy were studied. Sheet samples suitable for tensile testing were explosively loaded to pressures of 10, 20, 30, 40, and 50 GPa. Subsequent tensile tests were performed on samples in the as-shocked and shocked plus aged conditions. Their properties are compared to those of material deformed by cold rolling and aged after cold rolling. The mechanical strength in the as-shocked condition increases linearly with pressure. The strength of the shocked plus aged material also increases with shock pressure but at a slower rate. Unaged material shocked to 50 GPa has a higher yield strength than material cold rolled 37 pct. However, the cold rolled material responds better to aging. In the aged condition, 37 pct cold rolled material is stronger than the material shocked to 50 GPa. Transmission electron microscopy reveals the onset of deformation twinning between 10 and 20 GPa. The volume fraction of twins and the dislocation density both increase with increasing shock pressure. The results indicate that deformation twinning has little significant strengthening effect in this system and that yield strength increases can be accounted for on the basis of increasing dislocation density.
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Nordstrom, T.V., Rohde, R.W. & Mottern, D.J. Explosive strengthening of a Cu-Be alloy. Metall Trans A 6, 1561 (1975). https://doi.org/10.1007/BF02641968
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DOI: https://doi.org/10.1007/BF02641968