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Microstructure of Nb BASED A12O3 Composites

Published online by Cambridge University Press:  02 July 2020

C. Scheu ,
G. Dehm ,
W. D. Kaplan ,
D. E. Garcia  and
N. Claussen
C. Scheu
Affiliation:
Department of Materials Engineering, Technion - Israel Institute of Technology, Haifa, 32000, Israel
G. Dehm
Affiliation:
Department of Materials Engineering, Technion - Israel Institute of Technology, Haifa, 32000, Israel
W. D. Kaplan
Affiliation:
Department of Materials Engineering, Technion - Israel Institute of Technology, Haifa, 32000, Israel
D. E. Garcia
Affiliation:
Advanced Ceramics Group, Technische Universitat Hamburg-Harburg, 21071Hamburg, Germany
N. Claussen
Affiliation:
Advanced Ceramics Group, Technische Universitat Hamburg-Harburg, 21071Hamburg, Germany
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Extract

Metal-ceramic composites possess a wide range of applications due to an increased fracture toughness and strength compared to monolithic materials. A better understanding of the correlation between properties and microstructure of these materials requires a detailed analysis of the phases which form during processing. This can be accomplished by using various transmission electron microscopy (TEM) methods. In this study Nb based AI2O3 composites were investigated. The composites were prepared by pressureless sintering 2 of compacts of attrition milled AI2O3 and prealloyed Nb(Al) powder mixtures. The addition of 7 wt.% of Al to the Nb powder is supposed to assist in rapid and complete sintering of the material. The microstructure was studied in detail by conventional TEM using selected area diffraction (SAD). The chemistry and structure of the occurring phases, second phase particles and grain boundaries were analysed by analytical TEM and high resolution TEM (HRTEM).

Type
Microscopy of Ceramics and Minerals
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 588 - 589
Copyright
Copyright © Microscopy Society of America

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References

1. see e.g. Chou, T. W.Structure and Properties of Composites, Weinheim: VCH, Eds. Cahn, R.W., Haasen, P., Kramer, E. J., 1992.Google Scholar

2. Garcia, D. E. et al., submitted to J. Am. Ceram. Soc, 1997.Google Scholar