DRX The Dynamic Deformation Regime L E Murr

Acknowledgments • Supported in part by the U. S. Army Research Laboratory, Aberdeen Proving

The following students did the work: – – – – – Carlos Pizaña (Ph.

THE PLAN --which includes the objectives

Target S. B (DRX) Flow Zone Erosion Tube Penetrator S. B. (DRX) Flow Zone

CONCLUSIONS • Extreme Deformation – True strains above ~ 3 – Strain rate above

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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

Acknowledgments • Supported in part by the U. S. Army Research Laboratory, Aberdeen Proving Ground, MD – Prime Contract No. DATM 05 -02 -C-0046/Task Order #16 • Supported in part by U. S. Army TACOM – Picatinny Arsenal, NJ – Prime Contract No. W 15 QKN-04 M-0267 /Project No. 1 A 4 CFJERIANG. • Supported in part by a Mr. & Mrs. Mac. Intosh Murchison Endowed Chair at the University of Texas at El Paso

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. )

THE PLAN --which includes the objectives

RESULTS & EXAMPLES -- of DRX

a b

5. 9 km/s

Brass 5. 9 km/s

1. 5 km/s 7. 8 cm WHA

1. 35 km/s

W-9% Ta 1. 2 km/s

1. 33 km/s

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

Al-20% Al 2 O 3

Cu / Brass / Ag (In Plane)

Cu / Ag SEM In Plane

~ 15 μm

CONCLUSIONS • Extreme Deformation – True strains above ~ 3 – Strain rate above ~ 103 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.