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On the Kinetics of Nb5Si3 Compound Formation

Published online by Cambridge University Press:  01 January 1992

Jan Kajuch ,
John W. Short ,
Changqi Liu  and
John J. Lewandowski
Jan Kajuch
Affiliation:
Dept. of Materials Science and Engineering Case Western Reserve University, Cleveland, OH
John W. Short
Affiliation:
Dept. of Materials Science and Engineering Case Western Reserve University, Cleveland, OH
Changqi Liu
Affiliation:
Dept. of Materials Science and Engineering Case Western Reserve University, Cleveland, OH
John J. Lewandowski
Affiliation:
Dept. of Materials Science and Engineering Case Western Reserve University, Cleveland, OH
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Abstract

The kinetics of intermetallic Nb5Si3 compound formation via the mechanical alloying process was investigated. Interrupted milling process, X-ray diffraction, SEM examination and TEM imaging and diffraction were utilized to characterize changes in the milled powders, while DTA analyses were used to determine the critical and onset temperatures of reaction as a function of milling time. On the basis of experimental results, a kinetic model was proposed for formation of Nb5Si3 via the interrupted MA process. It is suggested that precipitation of Nb5Si3 particles during cooling in the interrupted milling process is responsible for the exothermic reaction after resumption of milling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 853
Copyright
Copyright © Materials Research Society 1995

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References

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