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Fabrication of NiAl Intermetallic from Dense Elemental Powder Blends VIA Solid State Reactions

Published online by Cambridge University Press:  15 February 2011

L. Farber ,
I. Gotman  and
E. Y. Gutmanas
L. Farber
Affiliation:
Department of Materials Engineering, Technion, Haifa 32000, Israel
I. Gotman
Affiliation:
Department of Materials Engineering, Technion, Haifa 32000, Israel
E. Y. Gutmanas
Affiliation:
Department of Materials Engineering, Technion, Haifa 32000, Israel
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Abstract

Dense NiAl intermetallic was synthesized from very fine elemental powders via solid state reactions. Homogeneous blends of micron size Ni and Al powders were consolidated to full density and heat treated in a 425–800°C temperature range. During heat treatment, formation of various intermediate intermetallics phases: NiAl3, Ni2A13, Ni3Al and NiAl was observed. The sequence and kinetics of these phase formations at different temperatures were studied employing X-ray diffraction analysis (XRD). A model for a description of synthesis reaction kinetics in Ni-Al blends was developed. Based on the obtained results, the synthesis of NiAl was performed in two stages : reactions in 425–550°C range with consumption of Al, followed by a reaction at up to 800°C. It allowed uncontrolled SHS (self propagating high temperature synthesis, resulting in the occurrence of liquid phases and in formation of reaction products in a very fast /explosive manner) to be avoid. The synthesis temperatures are considerably lower than those used currently in processing of NiAl.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 561
Copyright
Copyright © Materials Research Society 1997

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References

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