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The Kinetics of the Order-Disorder Transformation in the Pt1Co1−xNix Alloy System

Published online by Cambridge University Press:  15 February 2011

Huan Tu ,
Eduardo O. Ruiz  and
J. Orehotsky
Huan Tu
Affiliation:
Wilkes University, Department of Engineering, Wilkes Barre, PA 18766
Eduardo O. Ruiz
Affiliation:
Wilkes University, Department of Engineering, Wilkes Barre, PA 18766
J. Orehotsky
Affiliation:
Wilkes University, Department of Engineering, Wilkes Barre, PA 18766
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Abstract

The kinetics of atomic ordering in a series of alloys in the Pt1Co1−xNix ternary system where 0<x<0.5 were investigated by magnetic measurements. For all the alloys, the ordering kinetics as monitored by the saturation magnetization as a function of isothermal ordering time at a series of specified ordering temperatures, were found to be exponentially time dependent. The associated time constant was found to have an Arrhenius temperature dependence characterized by an activation energy that, with increasing nickel concentration, initially increased to maximum value at a nickel composition of x ∼.2 and then systematically decreased. This result for the activation energy as a function of nickel content was found to correlate roughly with the behavior of the saturation magnetization of the ordered alloys, suggesting that the kinetics of the transformation in this alloy system is sensitive to the magnetic properties of the ordered state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 343
Copyright
Copyright © Materials Research Society 1994

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References

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