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Xanes and Exafs Analysis of Ball-Milled Fe-Ni

Published online by Cambridge University Press:  21 March 2011

P.J. Schilling ,
R.C. Tittsworth ,
V. Palshin ,
J. Xu ,
E. Ma  and
J.-H. He
P.J. Schilling
Affiliation:
Mechanical Engineering Department, University of New Orleans (UNO), New Orleans, LA 70148, USA, [email protected]
R.C. Tittsworth
Affiliation:
Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, LA 70806, USA
V. Palshin
Affiliation:
Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, LA 70806, USA
J. Xu
Affiliation:
Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, LA 70806, USA
E. Ma
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
J.-H. He
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
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Abstract

EXAFS and XANES analysis have been applied in a study of ball-milled nano-crystalline iron-nickel alloys prepared with overall compositions spanning the two-phase region. EXAFS analysis was used to determine bond distances for like and unlike atom pairs in single phase face-centered cubic Fe-Ni alloys, demonstrating the presence of bond dilation for unlike neighbors. Using XANES analysis, the compositions of the two coexisting solid solutions were determined to characterize the ball-milled two-phase region. The compositions of the coexisting face-centered and body-centered cubic phases were found to be consistent with the overall composition of the mixture. The results obtained for the negative heat-of-mixing Fe-Ni system were used for comparison to the positive heat-of-mixing Fe-Cu system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 678: Symposia EE – Applications of Synchrotron Radiation Techniques…IV , 2001 , EE8.4.1
Copyright
Copyright © Materials Research Society 2001

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