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

An AlCoCrFeNi 2.1 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 AlCo...

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Bibliographic Details
Published in:Journal of dynamic behavior of materials 2019-12, Vol.5 (4), p.495-503
Main Authors: Choudhuri, Deep, Jannotti, Philip A., Muskeri, Saideep, Shukla, Shivakant, Gangireddy, Sindhura, Mukherjee, Sundeep, Schuster, Brian E., Lloyd, Jeffrey T., Mishra, Rajiv S.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Domains
Edge dislocations
Eutectic alloys
Failure modes
High entropy alloys
Materials Science
Metallic Materials
Microstructure
Projectiles
Research Paper
Shear bands
Solid Mechanics
Tungsten carbide
Velocity
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Summary:An AlCoCrFeNi 2.1 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 AlCoCrFeNi 2.1 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.
ISSN:2199-7446
2199-7454
DOI:10.1007/s40870-019-00220-z