High Entropy Alloy under Shock Compression: Optical-Pump X-Ray-Probe
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arXiv
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| Natura: | Preprint |
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2026
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| author | Huang, Hsin Hui Ryu, Meguya Kamegaki, Shuji Stonyte, Dominyka Malinauskas, Tadas Nishijima, Yoshiaki Hocking, Rosalie Le, Nguyen Hoai An Katkus, Tomas Mu, Haoran Ng, Soon Hock Pinches, Samuel Ang, Andrew S. M. Mizeikis, Vygantas Zatsepin, Nadia Miyanishi, Kohei Yabuuchi, Toshinori Nakamura, Hirotaka Amouretti, Alexis Ozaki, Norimasa Vinci, Tommaso Vailionis, Arturas Gamaly, Eugene G. Hicks, Damien G. Morikawa, Junko Juodkazis, Saulius |
| author_facet | Huang, Hsin Hui Ryu, Meguya Kamegaki, Shuji Stonyte, Dominyka Malinauskas, Tadas Nishijima, Yoshiaki Hocking, Rosalie Le, Nguyen Hoai An Katkus, Tomas Mu, Haoran Ng, Soon Hock Pinches, Samuel Ang, Andrew S. M. Mizeikis, Vygantas Zatsepin, Nadia Miyanishi, Kohei Yabuuchi, Toshinori Nakamura, Hirotaka Amouretti, Alexis Ozaki, Norimasa Vinci, Tommaso Vailionis, Arturas Gamaly, Eugene G. Hicks, Damien G. Morikawa, Junko Juodkazis, Saulius |
| contents | High entropy alloys (HEAs) are multi-principal-element alloys designed for tailorable mechanical performance and have been attracting significant engineering interest, yet their fundamental behaviour under extreme dynamic conditions, such as shock loading, remains unexplored. Here, we report laser-shock experiments on two different types of 1-micrometers-thick HEA microfilms, CuPdAgPtAu and CrFeCoNiCuMo, on 25-micrometers-thick black-Kapton ablator driven by a high intensity laser pulse (532 nm, 5 ns, 16 J, 0.5-mm diameter focal spot) and probed by an X-ray free electron laser (XFEL) pulse (12 keV, 7 fs). Time-resolved X-ray diffraction (XRD) shows the formation of a transient phase with a lattice compression up to 5.1% of the CuPdAgPtAu HEA along the (111) plane; this transient compressed phase existed for 0.3 ns. The impedance matching Hugoniot analysis estimated a shock pressure of 55 +/- 6 GPa in the HEA film, while Au- and Fe-based equations of state (EoS) modelling predict 80 GPa (0.8 MBar) at the free HEA surface. The free HEA surface reached maximum velocities of ~ 5 km/s as recorded from in situ monitoring with the velocity interferometry system for any reflector (VISAR) imaging. These initial HEA results show the suitability of HEA sample preparation and XFEL-based XRD characterisation under extreme shock loading, and are promising for experimental determination of the EoS of this emerging class of materials (beamtime proposal No.: 2024A8503 for a 6-hour preliminary experiment). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_21076 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High Entropy Alloy under Shock Compression: Optical-Pump X-Ray-Probe Huang, Hsin Hui Ryu, Meguya Kamegaki, Shuji Stonyte, Dominyka Malinauskas, Tadas Nishijima, Yoshiaki Hocking, Rosalie Le, Nguyen Hoai An Katkus, Tomas Mu, Haoran Ng, Soon Hock Pinches, Samuel Ang, Andrew S. M. Mizeikis, Vygantas Zatsepin, Nadia Miyanishi, Kohei Yabuuchi, Toshinori Nakamura, Hirotaka Amouretti, Alexis Ozaki, Norimasa Vinci, Tommaso Vailionis, Arturas Gamaly, Eugene G. Hicks, Damien G. Morikawa, Junko Juodkazis, Saulius Materials Science High Energy Physics - Experiment High entropy alloys (HEAs) are multi-principal-element alloys designed for tailorable mechanical performance and have been attracting significant engineering interest, yet their fundamental behaviour under extreme dynamic conditions, such as shock loading, remains unexplored. Here, we report laser-shock experiments on two different types of 1-micrometers-thick HEA microfilms, CuPdAgPtAu and CrFeCoNiCuMo, on 25-micrometers-thick black-Kapton ablator driven by a high intensity laser pulse (532 nm, 5 ns, 16 J, 0.5-mm diameter focal spot) and probed by an X-ray free electron laser (XFEL) pulse (12 keV, 7 fs). Time-resolved X-ray diffraction (XRD) shows the formation of a transient phase with a lattice compression up to 5.1% of the CuPdAgPtAu HEA along the (111) plane; this transient compressed phase existed for 0.3 ns. The impedance matching Hugoniot analysis estimated a shock pressure of 55 +/- 6 GPa in the HEA film, while Au- and Fe-based equations of state (EoS) modelling predict 80 GPa (0.8 MBar) at the free HEA surface. The free HEA surface reached maximum velocities of ~ 5 km/s as recorded from in situ monitoring with the velocity interferometry system for any reflector (VISAR) imaging. These initial HEA results show the suitability of HEA sample preparation and XFEL-based XRD characterisation under extreme shock loading, and are promising for experimental determination of the EoS of this emerging class of materials (beamtime proposal No.: 2024A8503 for a 6-hour preliminary experiment). |
| title | High Entropy Alloy under Shock Compression: Optical-Pump X-Ray-Probe |
| topic | Materials Science High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2603.21076 |