1. Dynamic Observation of Dendritic Quasicrystal Growth upon Laser-Induced Solid-State Transformation.
- Author
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Insung Han, McKeown, Joseph T., Ling Tang, Cai-Zhuang Wang, Parsamehr, Hadi, Zhucong Xi, Ying-Rui Lu, Kramer, Matthew J., and Shahani, Ashwin J.
- Subjects
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SOLID-state lasers , *PHASES of matter , *TRANSMISSION electron microscopy , *MOLECULAR dynamics , *QUASICRYSTALS - Abstract
We report the laser-induced solid-state transformation between a periodic "approximant" and quasicrystal in the Al-Cr system during rapid quenching. Dynamic transmission electron microscopy allows us to capture in situ the dendritic growth of the metastable quasicrystals. The formation of dendrites during solid-state transformation is a rare phenomenon, which we attribute to the structural similarity between the two intermetallics. Through ab initio molecular dynamics simulations, we identify the dominant structural motif to be a 13-atom icosahedral cluster transcending the phases of matter. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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