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arXiv · 2507.13218

Phase transitions of eutectic high entropy alloy AlCoCrFeNi2.1 under shock compression

Sophie E. Parsons·Kento Katagiri·Hangman Chen·Anirudh Hari·Sara J. Irvine·Dorian Luccioni·Rayen Lin·Laura E. Madril·Tharun Reddy·William J. McKinney·Jie Ren·Wuxian Yang·Norimasa Ozaki·Alexis Amouretti·Ryosuke Kodama·Hirotaka Nakamura·Yusuke Nakanishi·Masato Ota·Yusuke Seto·Sota Takagi·Takuo Okuchi·Yuhei Umeda·Yuichi Inubushi·Kohei Miyanishi·Keiichi Sueda·Tadashi Togashi·Makina Yabashi·Toshinori Yabuuchi·Wanghui Li·Paul E. Specht·Penghui Cao·Wen Chen·Yogesh K. Vohra·Leora Dresselhaus-Marais
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Abstract

High entropy alloys (HEAs) are a new class of metals that exhibit unique mechanical performance. Among HEAs, additively manufactured eutectic high entropy alloys (AM-EHEAs) have recently emerged as candidate materials for use in extreme conditions due to their simultaneous high strength and ductility. However, the deformation and structural evolution of AM-EHEAs under conditions of high pressure have not been well characterized, limiting their use in extreme applications. We present dynamic compression experiments and molecular dynamics simulations studying the structural evolution of AM-EHEA AlCoCrFeNi2.1 when compressed to pressures up to 400 GPa. Our in-situ X-ray diffraction measurements capture the appearance of fcc and bcc phases at different pressure conditions, with pure- and mixed-phase regions. Understanding the phase stability and structural evolution of the AM EHEA offers new insights to guide the development of high-performance complex materials for extreme conditions.

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Sophie E. Parsons, Kento Katagiri, Hangman Chen, Anirudh Hari, Sara J. Irvine, Dorian Luccioni, Rayen Lin, Laura E. Madril, Tharun Reddy, William J. McKinney, Jie Ren, Wuxian Yang, Norimasa Ozaki, Alexis Amouretti, Ryosuke Kodama, Hirotaka Nakamura, Yusuke Nakanishi, Masato Ota, Yusuke Seto, Sota Takagi, Takuo Okuchi, Yuhei Umeda, Yuichi Inubushi, Kohei Miyanishi, Keiichi Sueda, Tadashi Togashi, Makina Yabashi, Toshinori Yabuuchi, Wanghui Li, Paul E. Specht, Penghui Cao, Wen Chen, Yogesh K. Vohra, Leora Dresselhaus-Marais. 2025-11-12. Phase transitions of eutectic high entropy alloy AlCoCrFeNi2.1 under shock compression. https://doi.org/10.1002/adem.202502073

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