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Amorphization and Dislocation Evolution Mechanisms of Single Crystalline 6H-SiC

23 Pages Posted: 8 May 2019 First Look: Accepted

See all articles by Zhonghuai Wu

Zhonghuai Wu

University of New South Wales (UNSW) - Laboratory for Precision and Nano Processing Technologies

Weidong Liu

University of New South Wales (UNSW) - Laboratory for Precision and Nano Processing Technologies

Liangchi Zhang

University of New South Wales (UNSW) - Laboratory for Precision and Nano Processing Technologies

Sean Lim

University of New South Wales (UNSW) - Electron Microscope Unit

Abstract

The amorphization and dislocation evolution mechanisms of a single crystal 6H-SiC were systematically investigated by using nano-indentation, high-resolution transmitted electron microscope (HRTEM), molecular dynamics (MD) simulations and the generalized stacking fault (GSF) energy surface analysis. Two major plastic deformation mechanisms of 6H-SiC under nano-indentation were revealed by HRTEM, i.e., (1) an amorphization region near the residual indentation mark, and (2) dislocations below the amorphization region in both the basal and prismatic planes. MD results showed that the amorphization process corresponds to the first “pop-in” event of the indentation load-displacement curve, while the dislocation nucleation and propagation are related to the consequent “pop-in” events. The amorphization is confirmed to achieve via an initial transformation from wurtzite structure to an intermediate structure, and then a further amorphization process.

Keywords: 6H-SiC, Indentation, Amorphization, Dislocation, MD simulation

Suggested Citation

Wu, Zhonghuai and Liu, Weidong and Zhang, Liangchi and Lim, Sean, Amorphization and Dislocation Evolution Mechanisms of Single Crystalline 6H-SiC (May 8, 2019). Available at SSRN: https://ssrn.com/abstract=3384328

Zhonghuai Wu

University of New South Wales (UNSW) - Laboratory for Precision and Nano Processing Technologies

Australia

Weidong Liu

University of New South Wales (UNSW) - Laboratory for Precision and Nano Processing Technologies

Australia

Liangchi Zhang (Contact Author)

University of New South Wales (UNSW) - Laboratory for Precision and Nano Processing Technologies ( email )

Australia

Sean Lim

University of New South Wales (UNSW) - Electron Microscope Unit

Australia

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