Acta Metallurgica Sinica (English Letters)

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In-situ Observation of Crack Growth and Domain Switching Around Vickers Indentation on BaTiO3 Single Crystal Under Sustained Electric Field

Bing JIANG1), Yusong LIU2),Meicheng LI1)   

  1. 1) State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,School of Renewable Energy, North China Electric Power University,
    Beijing 102206, China
    2)Beijing Sustainable Development Center, Beijing 100035, China
  • Received:2013-07-11 Revised:2013-09-17 Online:2013-12-25 Published:2014-02-28
  • Contact: Bing JIANG
  • Supported by:

    National Natural Science Foundation of China (Nos. 51072021, 51202067, 51172069 and 50972032), Ph.D. Programs Foundation of Ministry of Education of China (No.~20110036110006) and the Fundamental Research Funds for the Central Universities (Nos. 11ZG02 and 12QN15).

Abstract:

The crack propagation and domain switching process around the indentation on the surface of barium titanate single crystal under the external electric field was investigated by atomic force microscope and polarized light microscope. The evolutions of domain switching and crack propagation were in-situ observed when a 90°a-cdomain wall moved across the indentation which was driven by external electric field.The results show that the incompatible strain induced by domain switching in the residual stress zone around the indentation is the driving force of the anisotropic crack propagation. The crack propagation results in the changes of the fine domain stripes around the crack tip.

Key words: Domain switching, Indentation, Crack propagation, BaTiO3, AFM