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Nonequilibrium Structures in Codeposited Cr-Fe-Ni Films

Published online by Cambridge University Press:  01 February 2011

E.D. Specht ,
P.D. Rack ,
A. Rar ,
G.M. Pharr ,
E.P. George  and
H. Hong
E.D. Specht
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831–6118, USA
P.D. Rack
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831–6118, USA
A. Rar
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831–6118, USA Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee, 37996, USA
G.M. Pharr
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831–6118, USA Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee, 37996, USA
E.P. George
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831–6118, USA Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee, 37996, USA
H. Hong
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA
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Abstract

Ternary libraries are prepared by codeposition of Cr, Fe, and Ni on single-crystal Si and Al2O3 (sapphire) substrates at ∼100°C. The varying proximity to the three metal sources produces a spread of compositions in the films, which are analyzed both as-deposited and after annealing in vacuum for 2 h at 500°C. Structural maps are produced using synchrotron radiation and simultaneous detection of 2D diffraction patterns and x-ray fluorescence spectra. Four phases are identified in the as-deposited films. Three phases occur in equilibrium: bcc (α), fcc (γ), and intermetallic (σ). The fourth phase does not correspond to any equilibrium phase in the Cr-Fe-Ni system; it is tentatively identified as isomorphic to the α-Mn (A12) structure. After annealing, the nonequilibrium phase is no longer observed, but the occurrence of the three equilibrium phases is still far from the equilibrium phase boundaries. The particle size measured by x rays is small (9–15 nm), suggesting that higher annealing temperatures are required for the growth of equilibrium phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 804: Symposium JJ – Combinatorial and Artificial Intelligence Methods in Materials Science II , 2003 , JJ6.3
Copyright
Copyright © Materials Research Society 2004

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References

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