Transonic Dislocation Propagation in Diamond

The motion of line defects (dislocations), the primary driver of plasticity, has been studied for almost a century but one of the most fundamental questions remains unsolved: what defines the maximum speed at which dislocations can propagate? Early interpretations based on elasticity theory suggest...

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Bibliographic Details
Published in:arXiv.org 2023-03
Main Authors: Katagiri, Kento, Pikuz, Tatiana, Fang, Lichao, Albertazzi, Bruno, Egashira, Shunsuke, Inubushi, Yuichi, Kamimura, Genki, Kodama, Ryosuke, Koenig, Michel, Kozioziemski, Bernard, Masaoka, Gooru, Miyanishi, Kohei, Nakamura, Hirotaka, Ota, Masato, Rigon, Gabriel, Sakawa, Youichi, Sano, Takayoshi, Schoofs, Frank, Smith, Zoe J, Sueda, Keiichi, Togashi, Tadashi, Vinci, Tommaso, Yabashi, Makina, Yabuuchi, Toshinori, Dresselhaus-Marais, Leora E, Ozaki, Norimasa
Format: Article
Language:English
Subjects:
Crystal defects
Crystal dislocations
Diamonds
Dislocation mobility
Material properties
Mechanical properties
Single crystals
Transverse waves
Wave fronts
X-ray radiography
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Summary:The motion of line defects (dislocations), the primary driver of plasticity, has been studied for almost a century but one of the most fundamental questions remains unsolved: what defines the maximum speed at which dislocations can propagate? Early interpretations based on elasticity theory suggest that dislocation motion should not exceed the transverse wave speed, but recent models and atomistic simulations predict that transverse wave speed is a forbidden speed but not the upper limit. We use femtosecond x-ray radiography to observe how dislocations in shock-compressed single-crystalline diamond travel with the plastic shock wavefront. The observed dislocation motions in the diamond show that dislocations can move faster than the transverse wave speed. As the ultrafast motion of dislocations causes unique behavior by which solids strengthen or fail, understanding the upper limit of dislocation mobility is critical to accurately model, predict, and control the mechanical properties of materials under extreme conditions.
ISSN:2331-8422