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Metastable copper-chromium alloy films

Published online by Cambridge University Press:  31 January 2011

A.P. Payne  and
B.M. Clemens
A.P. Payne
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
B.M. Clemens
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
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Abstract

Due to the large positive heat of mixing associated with the Cu–Cr binary system, solid solutions exist only as nonequilibrium states. In this study, a series of metastable Cu–Cr alloys ranging in composition from 14.1 to 75.4% copper was fabricated by sputter deposition. Symmetric, asymmetric, and grazing incidence x-ray diffraction geometries were used to trace the phase transition from bcc to fcc crystal structures with increasing Cu fraction. It is shown that the transition takes place not by a two-phase region suggested by equilibrium thermodynamics, but rather through gradual disordering of the bcc lattice as copper atoms are substitutionally accommodated. At a critical saturation near 71% Cu, the bcc structure becomes unstable relative to the fcc and a phase transition occurs. The free energies of the kinetically constrained Cu–Cr system are modeled and the results are found to agree well with observed behavior.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 6 , June 1992 , pp. 1370 - 1376
Copyright
Copyright © Materials Research Society 1992

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