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

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

doi:10.3390/met12091482

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

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

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

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.

Original language	English
Journal	Metals
Volume	12
Issue number	9
DOIs	https://doi.org/10.3390/met12091482
State	Published - Sep 1 2022
Externally published	Yes

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title = "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.",

author = "Andrew Ehler and Abhijeet Dhiman and Tyler Dillard and Remi Dingreville and Erin Barrick and Andrew Kustas and Vikas Tomar",

year = "2022",

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doi = "10.3390/met12091482",

language = "English",

volume = "12",

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TY - JOUR

T1 - High-Strain Rate Spall Strength Measurement for CoCrFeMnNi High-Entropy Alloy

AU - Ehler, Andrew

AU - Dhiman, Abhijeet

AU - Dillard, Tyler

AU - Dingreville, Remi

AU - Barrick, Erin

AU - Kustas, Andrew

AU - Tomar, Vikas

PY - 2022/9/1

Y1 - 2022/9/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85138713594

U2 - 10.3390/met12091482

DO - 10.3390/met12091482

M3 - Article

SN - 2075-4701

VL - 12

JO - Metals

JF - Metals

IS - 9

ER -

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

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