Ultrahigh flow strength in shocked nanopolycrystalline diamond
Abstract
Extreme pressures and temperatures create conditions that allow even hard and brittle materials to flow plastically. Despite extensive research, the limits of flow strength under such conditions remain uncertain, and the mechanisms driving deformation at the relevant stresses are a subject of debate. Using femtosecond in situ x-ray diffraction experiments and large-scale molecular dynamics simulations, we demonstrate that stacking fault-mediated strengthening enables shock-compressed nanopolycrystalline diamond to achieve a peak flow strength of 92 ± 3 GPa at a stress of 212 ± 6 GPa. Our findings show that extreme conditions can unlock ultrahigh strength via a complex array of competing deformation mechanisms and thermodynamic effects.
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Authors: Anirudh Hari, Kento Katagiri, Wanghui Li, Dorian Luccioni, Rayen Lin, Sophie E. Parsons, Zipeng Xu, Rohit Hari, Tharun Reddy, Ernest W. Cubit, Alexis Amouretti, J. H. Eggert, Yuichi Inubushi, Tetsuo Irifune, Sara J. Irvine, Ryosuke Kodama, M. Kœnig, Laura Madril, Takeshi Matsuoka, Kohei Miyanishi, Hirotaka Nakamura, Norimasa Nishiyama, Takuo Okuchi, Masato Ota, Toshimori Sekine, Yusuke Seto, Toru Shinmei, Keiichi Sueda, Yoshinori Tange, Sota Takagi, Tadashi Togashi, Y. Umeda, Yifan Wang, Makina Yabashi, T. Yabuuchi, Norimasa Ozaki, Leora E. Dresselhaus‐Marais
Institutions: University of California, Los Angeles, Kyoto University, Osaka City University, The University of Osaka, South China University of Technology, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Georgia Institute of Technology, Stanford University, Sorbonne Université, Japan Synchrotron Radiation Research Institute, Centre National de la Recherche Scientifique, Tokyo Institute of Technology, Life Science Institute, Okinawa Institute of Science and Technology Graduate University, Osaka University of Economics, Center for High Pressure Science and Technology Advanced Research, SLAC National Accelerator Laboratory, Kobe University, Agency for Science, Technology and Research, Cardiovascular Institute of the South, Carnegie Institution for Science, Ehime University, Lawrence Livermore National Laboratory, Institute of High Performance Computing, Laboratoire pour l'Utilisation des Lasers Intenses, SPring-8, Institute for Laser Technology, National Institute for Fusion Science