| Author(s) |
Anirudh Hari, Kento Katagiri, Paul E. Specht, Tharun Reddy, Sara Irvine, Laura Madril, Sophie E. Parsons, Jie Ren, Wuxian Yang, Suzanne Ali, Alexis Amouretti, Yuichi Inubushi, Ryosuke Kodama, Alex C. Li, Boya Li, Kohei Miyanishi, Hirotaka Nakamura, Yusuke Nakanishi, Yusuke Seto, Masato Ota, Sota Takagi, Yuhei Umeda, Yuhei Umeda, Takuo Okuchi, Norimasa Ozaki, Gaia Righi, Tadashi Togashi, Makina Yabashi, Toshinori Yabuuchi, Yogesh K. Vohra, Wen Chen, Leora E. Dresselhaus-Marais |
| Abstract Scope |
High entropy alloys (HEAs) are a new class of materials that have outstanding properties due to their complex elemental compositions. Understanding the high-pressure behavior of HEAs is essential for industrial and defense applications. In this work, we studied the eutectic high entropy alloy AlCoCrFeNi2.1, additively manufactured using laser powder bed fusion. This alloy has a far-from-equilibrium, dual-phase nanolamellar microstructure consisting of fcc and bcc phases, giving it both high strength and ductility.
We measured the shock response of AlCoCrFeNi2.1 under high strain rate shock compression at the Jupiter Laser Facility, DICE Facility, and SACLA-XFEL. In situ X-ray diffraction reveals that the initial dual-phase structure gives way to an fcc-only structure, a dense bcc-only structure, and then a liquid phase when compressed to increasingly higher pressures. Upon pressure release, the material back-transforms to the fcc/bcc dual-phase with varying phase fractions, revealing the role of rapid kinetics on these structural transformations. |