Shock-induced amorphization in silicon carbide

Zhao, S.; Flanagan, R.; Hahn, E. N.; Kad, B.; Remington, B. A.; Wehrenberg, C. E.; Cauble, R.; More, K.; Meyers, M. A.

doi:10.1016/j.actamat.2018.07.047

Title: Shock-induced amorphization in silicon carbide

Journal Article · 23 July 2018 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2018.07.047 · OSTI ID:1462276

Zhao, S. ^[1]; Flanagan, R. ^[2]; Hahn, E. N. ^[3]; Kad, B. ^[2]; Remington, B. A. ^[4]; Wehrenberg, C. E. ^[4]; Cauble, R. ^[4]; More, K. ^[5];

^[2]

Univ. of California, San Diego, CA (United States); The Regents of the Univ. of Calif.,U.C. San Diego
Univ. of California, San Diego, CA (United States)
Univ. of California, San Diego, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

While silicon carbide (SiC) has been predicted to undergo pressure-induced amorphization, the microstructural evidence of such a drastic phase change is absent as its brittleness usually prevents its successful recovery from high-pressure experiments. In this paper we report on the observation of amorphous SiC recovered from laser-ablation-driven shock compression with a peak stress of approximately 50 GPa. Transmission electron microscopy reveals that the amorphous regions are extremely localized, forming bands as narrow as a few nanometers. In addition to these amorphous bands, planar stacking faults are observed. Large-scale non-equilibrium molecular dynamic simulations elucidate the process and suggest that the planar stacking faults serve as the precursors to amorphization. Finally, our results suggest that the amorphous phase produced is a high-density form, which enhances its thermodynamical stability under the high pressures combined with the shear stresses generated by the uniaxial strain state in shock compression.

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Research Organization:: Univ. of California, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. of California (United States)

Grant/Contract Number:: NA0002930; FG52-09NA29043; AC52-07NA27344

OSTI ID:: 1462276

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 158; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Plasticity without dislocations in a polycrystalline intermetallic Luo, Hubin; Sheng, Hongwei; Zhang, Hongliang Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-11505-1	journal	August 2019
Plasticity without dislocations in a polycrystalline intermetallic Luo, Hubin; Sheng, Hongwei; Zhang, Hongliang Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-11505-1	journal	August 2019

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