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Pressure-induced amorphization in the nanoindentation of single crystalline silicon

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Abstract

Large-scale molecular dynamics simulations of nanoindentation on a (100) oriented silicon surface were performed to investigate the mechanical behavior and phase transformation of single crystalline silicon. The direct crystalline-to-amorphous transformation is observed during the nanoindentation with a spherical indenter as long as the applied indentation strain or load is large enough. This amorphization is accompanied by a distinct discontinuity in the load–indentation strain curves, known as “pop-in”. Herein, we have demonstrated the pressure-induced amorphization processes via direct lattice distortion. Moreover, the combination of large shear stress and associated hydrostatic pressure facilitates this crystalline-to-amorphous transformation. The structural characteristics, phase distribution, and phase transformation path have also been discussed in this study. The present results provide a new insight into the mechanical behavior and phase transformation of monocrystalline silicon.

Graphical abstract: Pressure-induced amorphization in the nanoindentation of single crystalline silicon

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Publication details

The article was received on 31 Oct 2016, accepted on 05 Dec 2016 and first published on 05 Jan 2017


Article type: Paper
DOI: 10.1039/C6RA26094B
Citation: RSC Adv., 2017,7, 1357-1362
  • Open access: Creative Commons BY-NC license
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    Pressure-induced amorphization in the nanoindentation of single crystalline silicon

    J. Han, S. Xu, J. Sun, L. Fang and H. Zhu, RSC Adv., 2017, 7, 1357
    DOI: 10.1039/C6RA26094B

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