1. DRX: The Dynamic Deformation Regime L. E. Murr* Department of Metallurgical & Materials Engineering The University of Texas at El Paso * Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences – Visiting Professor and Lee Hsun Lecturer in Materials Science - 2010

2. Acknowledgments Supported in part by the U.S. Army Research Laboratory, Aberdeen Proving Ground, MD – Prime Contract No. DATM05 -02-C-0046/Task Order #16 Supported in part by U.S. Army TACOM – Picatinny Arsenal, NJ – Prime Contract No. W15QKN-04M-0267 /Project No. 1A4CFJERIANG. Supported in part by a Mr. & Mrs. MacIntosh Murchison Endowed Chair at the University of Texas at El Paso

3. The following students did the work: –Carlos Pizaña (Ph.D.) –Fabiola Martinez (M.S.) –Micah Baquera (M.S.) –Christina Piña (B.S.) –Isaac Anchondo (B.S.) –Amanda Ramirez (M.S.) –Maribel Lopez (B.S.) –Sara Gytan (B.S.) –Daniel Bujanda (B.S.) –Erika Esquivel (Ph.D.) –Sridhar Pappu (Ph.D.) –Christine Kennedy (Ph.D.) –Valerie Hernandez (M.S.) –Julie Flores (B.S.) –Elizabeth Trillo (Ph.D.) –Aditya Putrevu (M.S.) –Olga Valerio (Ph.D.) –Everaldo Ferreyra (Ph.D.) –Andy Bujanda (B.S.) –Ben Gonzalez (M.S.)

4. THE PLAN --which includes the objectives

6. RESULTS & EXAMPLES -- of DRX

7. a b

8. a

9. 5.9 km/s

11. Brass 5.9 km/s

14. α β

19. 1.5 km/s 7.8 cm WHA

22. 1.35 km/s

23. W-9% Ta 1.2 km/s

27. 1.33 km/s

28. Deformed Target Zone Target S.B (DRX) Flow Zone Erosion Tube Turbulent/Interface Mix. Zone Crystalline Block & Twinning Zone Lightly Deformed Penetrator S.B. (DRX) Flow Zone Erosion Tube

33. Al-20% Al 2 O 3

34. Cu / Brass Brass / Ag Brass / Ag (In Plane)

35. SEM In Plane Cu / Ag

36. ~ 15 μm

49. CONCLUSIONS Extreme Deformation –True strains above ~ 3 –Strain rate above ~ 10 3 occurs by DRX, which allows for material flow in the solid state The DRX regime is outside the “normal” deformation regime. Dynamic deformation, beyond the “normal” deformation regime, is characterized by DRX. All ASBs are a manifestation of the DRX regime.