Journal of Inorganic Materials

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Indentation-induced Plasticity, Damage and Fracture in Si and GaAs Single Crystals

XU Yong-Bo   

  1. (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
  • Received:2008-12-31 Revised:2009-05-08 Published:2009-11-20 Online:2010-04-22

Abstract: Investigations of the plasticity, damage and fracture induced by microindentation are reviewed. The principal findings are: (a) Micro-indentation may induce a transition from crystalline to nano-crystalline and amorphous structure, and there is a critical stress for this kind of transition. The shear stress, rather than the hydrostatic stress is proposed to be attributed to this transition. (b) There is a critical current density for the crystalline nucleation, and it is no related to the irradiation-induced temperature rise. (c) The crack-tip produced dislocations by during indentation is not atomically sharp, leading to crystal lattice distortion, and even to a transition from a crystalline lattice to disordered structure. An amorphous band with a width of 1-2nm between crack-walls is formed, and the crack propagation is then along the amorphous band, rather than sequential rupture of the cohesive bonds. (d) Fast Fourier Transformation (FFT)-SAED and corresponding Inverse-Fast Fourier Transformation (IFFT) fringe images from different lattice planes in selected areas of the crack-tip show that deformation around the cracktip deformation is anisotropic.

Key words: microindentation, HRTEM, crystallization and amorphization, crack-tip structure, Fast Fourier Transformation (FFT) and Inverse-Fast Fourier Transformation (IFFT)

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