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Phase formation and thermodynamics of unstable Cu–Cr alloys

Published online by Cambridge University Press:  31 January 2011

C. Michaelsen ,
C. Gente  and
R. Bormann
C. Michaelsen
Affiliation:
Institute of Materials Research, GKSS Research Center, 21502 Geesthacht, Germany
C. Gente
Affiliation:
Institute of Materials Research, GKSS Research Center, 21502 Geesthacht, Germany
R. Bormann
Affiliation:
Institute of Materials Research, GKSS Research Center, 21502 Geesthacht, Germany
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Abstract

The quantitative description of highly nonequilibrium processes for the preparation of metastable and unstable phases requires the determination of the thermodynamic functions of the system under investigation. However, in systems such as Cu–Cr which are immiscible in the equilibrium states, the determination of the thermodynamic functions over the entire concentration range is often difficult if not impossible because reliable experimental data are not available for the metastable or unstable regime. The present paper demonstrates that such data can be obtained by a combination of thin film deposition techniques and differential scanning calorimetry. It is concluded that the phase formation in such thin films can be described in terms of the thermodynamics of the system, even when the heats of mixing are highly positive. The results indicate that models of the regular solution type still provide a reasonable description of the thermodynamic functions of such alloys.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 6 , June 1997 , pp. 1463 - 1467
Copyright
Copyright © Materials Research Society 1997

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References

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