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Characterization of NixCo1−xO/ZrO2(CaO) directionally solidified eutectic (DSE) ceramic composites with a ductile interphase

Published online by Cambridge University Press:  31 January 2011

Nasim Alem ,
Vinayak P. Dravid  and
Shuyou Li
Nasim Alem
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Vinayak P. Dravid*
Affiliation:
Electron Probe Instrumentation Center (EPIC), Northwestern University Atomic; and Nanoscale Characterization Experimental Center (NUANCE), Northwestern University, Evanston, Illinois 60208
Shuyou Li
Affiliation:
Electron Probe Instrumentation Center (EPIC), Northwestern University Atomic; and Nanoscale Characterization Experimental Center (NUANCE), Northwestern University, Evanston, Illinois 60208
*
a)Address all correspondence to this author. e-mail: v-dravid@northwestern.edu
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Abstract

NixCo1−xO/ZrO2(CaO) directionally solidified eutectics (DSEs) form a ductile metallic interphase after they are chemically reduced at high temperatures. Vickers indentation tests have previously shown a significant change in the crack propagation behavior of the reduced composites due to plastic deformation and strain energy absorption mechanisms operating in the system after reduction. This paper focuses on structural and chemical characterization of NixCo1−xO/ZrO2(CaO) DSEs after reduction. Analytical transmission electron microscopy techniques such as energy dispersive x-ray spectroscopy (EDXS) and electron energy loss spectroscopy (EELS) show elimination of oxygen and formation of nanoscale Ni(Co) solid.

Keywords

CompositeFractureTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 1797 - 1805
Copyright
Copyright © Materials Research Society 2007

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