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Alloy Effects And Extended Solubilities In Binary Mixtures Of Nanometer-Sized Fe-Cu Crystals

Published online by Cambridge University Press:  25 February 2011

J. Eckert ,
R. Birringer ,
J. C. Holzer ,
C. E. Krill III  and
W. L. Johnson
J. Eckert
Affiliation:
California Institute of Technology, W.M. Keck Laboratory of Engineering Materials 138–78, Pasadena, CA 91125;
R. Birringer
Affiliation:
California Institute of Technology, W.M. Keck Laboratory of Engineering Materials 138–78, Pasadena, CA 91125;
J. C. Holzer
Affiliation:
California Institute of Technology, W.M. Keck Laboratory of Engineering Materials 138–78, Pasadena, CA 91125;
C. E. Krill III
Affiliation:
California Institute of Technology, W.M. Keck Laboratory of Engineering Materials 138–78, Pasadena, CA 91125;
W. L. Johnson
Affiliation:
California Institute of Technology, W.M. Keck Laboratory of Engineering Materials 138–78, Pasadena, CA 91125;
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Abstract

Binary mixtures of Fe-Cu powders in the range of 10–95 at.% Fe have been prepared by mechanical alloying and investigated by x-ray diffraction, differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The final grain sizes of the powders vary between 6 and 20 nm, and depend on the composition of the material. Indications for the formation of single-phase alloys with up to 60 at.% Fe in Cu and 20 at.% Cu in Fe have been found although the Fe-Cu system exhibits only vanishingly small solid solubilities under equilibrium conditions. Between 60 at.% and 80 at.% Fe a two-phase region of fee and bec solid solutions exists. Alloy formation is discussed with respect to the thermodynamic conditions of the material. The influence of the large grain boundary fraction, as well as the role of internal strains and stored enthalpies introduced by ball milling, is critically assessed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 739
Copyright
Copyright © Materials Research Society 1992

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