509 走査型プローブ顕微鏡によるセラミックスのハイブリッドナノフラクトグラフィー(セラミック/セラミック基複合材料2)

概要

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In this study, nano-scale observation of a crack and a fracture surface of using scanning probe microscope was applied to the ferroelectric and the ferromagnetic ceramics. Smultaneous observation of a profile and a property of a crack and a fracture surface was carried out using piezoelectric force microscope (PFM), scanning nonlinear dielectric microscope (SNDM), and magnetic force microscop (MFM), which is named "Hybrid nano-fractography". In BaTiO_3 ceramics, Only domain with unidirectional polarization was observed on the fracture surface by SNDM, which is different from the PRM image. It was also shown that the domain structure was changed near the crack tip by crack propagation. It is because that the local domain switching induced by stress concentration near the crack tip. In Mn-Zn ferrite ceramics, it was shown that a crack induced by Vickers indentation was not open and there was a small step along the crack from the topo image. The magnetic force image indicated that there is the magnetic domain where magnetic polarity reversed near the crack.
社団法人日本機械学会の論文
2007-11-16