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Journal of Dynamic Behavior of Materials

, Volume 5, Issue 4, pp 495–503 | Cite as

Ballistic Response of a FCC-B2 Eutectic AlCoCrFeNi2.1 High Entropy Alloy

  • Deep ChoudhuriEmail author
  • Philip A. Jannotti
  • Saideep Muskeri
  • Shivakant Shukla
  • Sindhura Gangireddy
  • Sundeep Mukherjee
  • Brian E. Schuster
  • Jeffrey T. Lloyd
  • Rajiv S. Mishra
Research Paper
  • 86 Downloads

Abstract

An AlCoCrFeNi2.1 eutectic high entropy alloy (EHEA), comprising of FCC phase and a high volume fraction of plate and irregularly shaped BCC-ordered intermetallic B2 domains, was subjected to normal impact by spherical Tungsten–Carbide projectiles. Depending on projectile velocity, the impacted AlCoCrFeNi2.1 plates were partially penetrated (at the lowest velocity of 803 m/s), plugged (intermediate velocity of 1159 m/s), and fully penetrated (highest velocity of 1388 m/s). Electron microscopy was utilized to characterize the residual damage or deformation features in the recovered specimens. Failure in the partially penetrated conditions was dominated by interfacial decohesion at the plate-like B2 and FCC interfaces. At higher velocities where plugging occurred, failure was dominated by crack formation in regions containing adiabatic shear band. These results indicated a transition in failure modes as a function of projectile velocities, where the FCC-B2 microstructure dominate failure at lower velocities, while such microstructural features do not influence dynamic failure at higher velocities.

Keywords

Eutectic high entropy alloy Dynamic loading Failure 

Notes

Acknowledgements

The work was performed under a cooperative agreement between the U.S. Army Research Laboratory and the University of North Texas (W911NF-16–2-0189). We also acknowledge the Materials Research Facility at UNT for the microscopy facilities.

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Copyright information

© Society for Experimental Mechanics, Inc 2019

Authors and Affiliations

  • Deep Choudhuri
    • 1
    • 2
    • 3
    Email author
  • Philip A. Jannotti
    • 4
  • Saideep Muskeri
    • 1
  • Shivakant Shukla
    • 1
  • Sindhura Gangireddy
    • 1
    • 2
  • Sundeep Mukherjee
    • 1
    • 2
  • Brian E. Schuster
    • 4
  • Jeffrey T. Lloyd
    • 4
  • Rajiv S. Mishra
    • 1
    • 2
  1. 1.Department of Materials Science and EngineeringUniversity of North TexasDentonUSA
  2. 2.Advanced Materials and Manufacturing Processes InstituteUniversity of North TexasDentonUSA
  3. 3.Department of Materials and Metallurgical EngineeringNew Mexico Institute of Mining and TechnologySocorroUSA
  4. 4.US Army Research LaboratoryAberdeen Proving GroundUSA

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