Excellent ballistic impact resistance of Al0.3CoCrFeNi multi-principal element alloy with unique bimodal microstructure

Muskeri, Saideep; Gwalani, Bharat; Jha, Shristy; Yu, Anqi; Jannotti, Philip A.; Haridas, Ravi Sankar; Schuster, Brian E.; Lloyd, Jeffrey T.; Mishra, Rajiv S.; Mukherjee, Sundeep

doi:10.1038/s41598-021-02209-y

Excellent ballistic impact resistance of Al_0.3CoCrFeNi multi-principal element alloy with unique bimodal microstructure

Journal Article · Sun Nov 21 23:00:00 EST 2021 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-021-02209-y· OSTI ID:1835879

Muskeri, Saideep ^[1]; ^[2]; Jha, Shristy ^[1]; Yu, Anqi ^[3]; Jannotti, Philip A. ^[4]; Haridas, Ravi Sankar ^[1]; Schuster, Brian E. ^[5]; Lloyd, Jeffrey T. ^[4]; Mishra, Rajiv S. ^[1]; Mukherjee, Sundeep ^[1]

Univ. of North Texas, Denton, TX (United States); Univ. of North Texas, Denton, TX (United States). Advance Materials and Manufacturing Processes Institute (AMMPI)
Univ. of North Texas, Denton, TX (United States); Univ. of North Texas, Denton, TX (United States). Advance Materials and Manufacturing Processes Institute (AMMPI); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
DEVCOM Army Research Lab., Aberdeen Proving Ground, MD (United States)
Univ. of Texas at El Paso, TX (United States)

Multi-principal element alloys represent a new paradigm in structural alloy design with superior mechanical properties and promising ballistic performance. Here, the mechanical response of Al_0.3CoCrFeNi alloy, with unique bimodal microstructure, was evaluated at quasistatic, dynamic, and ballistic strain rates. The microstructure after quasistatic deformation was dominated by highly deformed grains. High density of deformation bands was observed at dynamic strain rates but there was no indication of adiabatic shear bands, cracks, or twinning. The ballistic response was evaluated by impacting a 12 mm thick plate with 6.35 mm WC projectiles at velocities ranging from 1066 to 1465 m/s. The deformed microstructure after ballistic impact was dominated by adiabatic shear bands, shear band induced cracks, microbands, and dynamic recrystallization. The superior ballistic response of this alloy compared with similar Al_xCoCrFeNi alloys was attributed to its bimodal microstructure, nano-scale L1₂ precipitation, and grain boundary B2 precipitates. Deformation mechanisms at quasistatic and dynamic strain rates were primarily characterized by extensive dislocation slip and low density of stacking faults. Deformation mechanisms at ballistic strain rates were characterized by grain rotation, disordering of the L1₂ phase, and high density of stacking faults.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; US Army Research Office (ARO)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1835879

Report Number(s):: PNNL-SA--168037

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 11; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Excellent ballistic impact resistance of Al0.3CoCrFeNi multi-principal element alloy with unique bimodal microstructure

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