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Solid-State Alloying in Binary Systems with a Positive Heat of Mixing

Published online by Cambridge University Press:  21 February 2011

E. Ma ,
J.-H. He ,
P.J. Schilling ,
F. Pan  and
B.X. Liu
E. Ma
Affiliation:
Department of Mechanical Engineering and Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, Baton Rouge, LA 70803, USA
J.-H. He
Affiliation:
Department of Mechanical Engineering and Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, Baton Rouge, LA 70803, USA
P.J. Schilling
Affiliation:
Department of Mechanical Engineering and Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, Baton Rouge, LA 70803, USA
F. Pan
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
B.X. Liu
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
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Abstract

The Extended X-ray Absorption Fine Structure (EXAFS) technique has been employed to monitor the formation of metastable alloys by mechanical alloying in two positive-heat-of-mixing systems, Cu-Fe and Ag-Fe. With its unique atom selectivity and local atomic environment sensitivity, EXAFS provides clear evidence of atomic-level alloying forming bcc (Fe80Cu20) and fee (Fe50Cu50) solid solutions in the Cu-Fe system. In contrast, such alloying appears to be absent in Ag-Fe. The possible availability of a thermodynamic driving force for alloying in certain nanostructured mixtures of immiscible elements is discussed. A preliminary study was performed on the possibility of alloying and amorphization in vacuum-deposited Cu/Ta multilayer films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 221
Copyright
Copyright © Materials Research Society 1998

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References

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