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The scanning electron acoustic microscopy investigation on ferroic materials under local stress

Published online by Cambridge University Press:  31 January 2011

Hongzhang Song ,
Yongxiang Li ,
Kunyu Zhao ,
Huarong Zeng ,
Guorong Li  and
Qingrui Yin
Hongzhang Song*
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Qingrui Yin
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
*
a) Address all correspondence to this author. e-mail: songhongzhang@hotmail.com
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Abstract

In this paper, the responses in the microregion of three ferroic-type materials, such as ferroelectric single crystals (PMN-PT and BaTiO3), ferromagnetic alloy (Fe81Ga19), and ferroelastic alloy (Ni53Mn24Ga23), to local stress induced by Vickers indentations were studied using scanning electron-acoustic microscopy (SEAM), a powerful technique for nondestructive investigation of the microstructure of materials. The responses of ferroelectric domains, magnetic domains, and ferroelastic domains to local stress were successfully observed. These responses possess three major features including the plastic deformation underneath the indenter, the extension of microcracks induced by indentation, and the formation of new lamellar domains within the matrix domain structure. In addition, by using the unique ability of SEAM to image layer by layer, the distributions of residual stress at different depths were obtained. The generation mechanisms of the electron acoustic signals of ferroelectric domains, magnetic domains, and ferroelastic domains are discussed.

Keywords

FerroelectricFerromagneticMicrostructure
Type
Outstanding Symposium Papers
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2173 - 2178
Copyright
Copyright © Materials Research Society 2009

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