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The Early Stages of Solid-State Reactions in Ti/Al Multilayer Films

Published online by Cambridge University Press:  21 February 2011

C. Michaelsen ,
S. WÖHlert ,
R. Bormann  and
K. Barmak
C. Michaelsen
Affiliation:
GKSS Research Center, Institute for Materials Research, 21502 Geesthacht, Germany
S. WÖHlert
Affiliation:
GKSS Research Center, Institute for Materials Research, 21502 Geesthacht, Germany
R. Bormann
Affiliation:
GKSS Research Center, Institute for Materials Research, 21502 Geesthacht, Germany
K. Barmak
Affiliation:
Lehigh University, Department of Materials Science and Engineering, Bethlehem, PA 18015
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Abstract

We have investigated the solid-state reaction of Ti/Al multilayer films by x-ray diffraction (XRD) and differential scanning calorimetry (DSC), with focus on the early stages of the reaction provided by samples with pair thicknesses in the range 5 - 40 nm. This reaction, which results in formation of TiAl3 with metastable Ll2 structure, can be modeled by a nucleation and growth process on the basis of the Johnson-Mehl-Avrami theory, with a reaction-order parameter n ≈1. These observations indicate the significance of nucleation barriers even at early stages of solid-state reactions, and suggests that the phenomena of phase selection and formation of metastable phases can result from the presence of nucleation barriers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 245
Copyright
Copyright © Materials Research Society 1998

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References

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