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A Thermodynamic Model for Solid State Amorphization: Application to Ni-Ti Multilayers of Different Microstructures

Published online by Cambridge University Press:  10 February 2011

A. Böttger ,
R. Benedictas  and
E.J. Mittemeijer
A. Böttger
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
R. Benedictas
Affiliation:
Hoogovens Research Laboratory, P.B. 10.000, 1970 CA Umuiden, The Netherlands
E.J. Mittemeijer
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
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Abstract

On the basis of an assessment of both the phase-formation energies and the energies of interfaces and grain boundaries the driving force for solid state amorphization (SSA) in crystalline Ni- crystalline Ti and amorphous Ni- crystalline Ti multilayers was calculated. It followed that the structure of the interfaces and grain boundaries, and thus their energies is of crucial importance for the occurrence (or not) of SSA. The SSA behaviour of the two types of Ni-Ti multilayers upon annealing was investigated using X-ray diffraction and (high resolution) transmission electron microscopy. The crystalline Ni- crystalline Ti multilayers showed SSA at both the Ni-Ti interfaces and the Ti grain boundaries. The amorphous Ni- crystalline Ti multilayers exhibited SSA at the Ti grain boundaries only. These observations agree with the predictions from the thermodynamic model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 472: Symposium I – Polycrystalline Thin Films - Structure, Texture, Properties..III , 1997 , 167
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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