THE RESPONSE OF SINGLE-CRYSTAL AND POLYCRYSTAL NICKEL TO QUASI-STATIC AND SHOCK DEFORMATION

Stress-strain measurements and TEM observations in shock-deformed <100> and <111> nickel single and polycrystalline samples are reported. When the reload stress measurements of the shock-recovered samples are normalized by the appropriate Taylor factor, the shock-induced strain hardening is found to be similar in all materials studied. Microscopic observations and strength measurements indicate that the shock-induced hardening is similar to the hardening found in samples deformed quasistatically to strains three times those that occur in the shock wave.