Abstract
Regimes involving very high strains (e 900%) and high strain rates (e 10 4 to 10 7 s −1 ) provide intriguing and often systematic examples of low-energy dislocation structures (IEDS). In this broad study, microstructure evolution in plane-wave shock-loaded Ni and Cu is compared with microstructures observed in starting Cu and To shaped charge liner cones, and recovered jet fragments and slugs. These microstructures, in turn, are compared with corresponding end-point microstructures in a Ta explosively formed penetrator (EFP) utilizing TEM techniques. In addition, microstructures associated with a hypervelocity impact crater in Cu are compared with the Cu shaped charge microstructures. Dynamically induced grain refinement (subgrain formation) and recovery play varying and important roles in the evolution and features of observed LEDS, and are a manifestation of adiabatic heating due to high strain and strain-rate effects ( (e) (e)). LEDS, which are characteristic of high strain and ultra-high strain-rate deformation, cause an inversion in hardness and flow stress profiles since as these microstructures decrease in size, hardness will decrease. By contrast when low-temperature LEDS decrease in size hardness increases
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
