High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy
Abstract
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.
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1886085
- Alternate Identifier(s):
- OSTI ID: 1888511
- Report Number(s):
- SAND2022-12630J
Journal ID: ISSN 2075-4701; MBSEC7; PII: met12091482
- Grant/Contract Number:
- 2193858; NA0003525
- Resource Type:
- Published Article
- Journal Name:
- Metals
- Additional Journal Information:
- Journal Name: Metals Journal Volume: 12 Journal Issue: 9; Journal ID: ISSN 2075-4701
- Publisher:
- MDPI AG
- Country of Publication:
- Switzerland
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; high-entropy alloy; cantor alloy; equation of state; spall strength; laser-induced projectile impact testing; Photon Doppler Velocimetry
Citation Formats
Ehler, Andrew, Dhiman, Abhijeet, Dillard, Tyler, Dingreville, Remi, Barrick, Erin, Kustas, Andrew, and Tomar, Vikas. High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy. Switzerland: N. p., 2022.
Web. doi:10.3390/met12091482.
Ehler, Andrew, Dhiman, Abhijeet, Dillard, Tyler, Dingreville, Remi, Barrick, Erin, Kustas, Andrew, & Tomar, Vikas. High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy. Switzerland. https://doi.org/10.3390/met12091482
Ehler, Andrew, Dhiman, Abhijeet, Dillard, Tyler, Dingreville, Remi, Barrick, Erin, Kustas, Andrew, and Tomar, Vikas. Wed .
"High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy". Switzerland. https://doi.org/10.3390/met12091482.
@article{osti_1886085,
title = {High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy},
author = {Ehler, Andrew and Dhiman, Abhijeet and Dillard, Tyler and Dingreville, Remi and Barrick, Erin and Kustas, Andrew and Tomar, Vikas},
abstractNote = {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.},
doi = {10.3390/met12091482},
journal = {Metals},
number = 9,
volume = 12,
place = {Switzerland},
year = {Wed Sep 07 00:00:00 EDT 2022},
month = {Wed Sep 07 00:00:00 EDT 2022}
}
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