High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy

Ehler, Andrew; Dhiman, Abhijeet; Dillard, Tyler; Dingreville, Remi; Barrick, Erin; Kustas, Andrew; Tomar, Vikas

doi:10.3390/met12091482

Title: High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy

Journal Article · Wed Sep 07 00:00:00 EDT 2022 · Metals

DOI:https://doi.org/10.3390/met12091482· OSTI ID:1886085

Ehler, Andrew; Dhiman, Abhijeet; Dillard, Tyler; Dingreville, Remi; Barrick, Erin; Kustas, Andrew;

In this study, we experimentally investigate the high stain rate and spall behavior of Cantor high-entropy alloy (HEA), CoCrFeMnNi. First, the Hugoniot equations of state (EOS) for the samples are determined using laser-driven CoCrFeMnNi flyers launched into known Lithium Fluoride (LiF) windows. Photon Doppler Velocimetry (PDV) recordings of the velocity profiles find the EOS coefficients using an impedance mismatch technique. Following this set of measurements, laser-driven aluminum flyer plates are accelerated to velocities of 0.5–1.0 km/s using a high-energy pulse laser. Upon impact with CoCrFeMnNi samples, the shock response is found through PDV measurements of the free surface velocities. From this second set of measurements, the spall strength of the alloy is found for pressures up to 5 GPa and strain rates in excess of 10⁶ s^-1. Further analysis of the failure mechanisms behind the spallation is conducted using fractography revealing the occurrence of ductile fracture at voids presumed to be caused by chromium oxide deposits created during the manufacturing process.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 2193858; NA0003525

OSTI ID:: 1886085

Alternate ID(s):: OSTI ID: 1888511

Report Number(s):: SAND2022-12630J; MBSEC7; PII: met12091482

Journal Information:: Metals, Journal Name: Metals Vol. 12 Journal Issue: 9; ISSN 2075-4701

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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36 MATERIALS SCIENCE
high-entropy alloy
cantor alloy
equation of state
spall strength
laser-induced projectile impact testing
Photon Doppler Velocimetry

Title: High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy

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