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Analysis of Residual Phases in Nickel Aluminide Powders Produced by Reaction Synthesis

Published online by Cambridge University Press:  01 January 1992

K. P. Mccoy ,
K. G. Shaw  and
J. A. Trogolo
K. P. Mccoy
Affiliation:
Xform, Inc. Cohoes, NY
K. G. Shaw
Affiliation:
Xform, Inc. Cohocs, NY
J. A. Trogolo
Affiliation:
Rensselaer Polytechnic Institute
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Abstract

The use of x-ray diffraction has been used to determine phases present after reaction synthesis of Ni3Al powder. The complex diffraction spectra produced by the powder prompted the development of a simulator. The simulator uses nonlinear regression to determine the weight percent of the phases present. The simulator also determines the broadening of each peak in the spectrum. The phases present in Ni3Al powder produced by reaction synthesis has been determined with the simulator. The simulator has been used to monitor the progress of phase transformation during various thermal treatments of Ni3Al powder. A thermal cycle of 1200°C for two hours has been shown to produce a phase-pure product. The activation energy for the intcrdiffusion of nickel and aluminum has been determined to be 260 ± 35 k.J/mole.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 909
Copyright
Copyright © Materials Research Society 1995

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References

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