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Synchrotron X-ray Absorption Studies of Atomic-Level Alloying in Immiscible Mixtures

Published online by Cambridge University Press:  10 February 2011

J.-H. He ,
P. J. Schilling  and
E. Ma
J.-H. He
Affiliation:
Center for Advanced Microstructures and Devices (CAMD) and Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803
P. J. Schilling
Affiliation:
Center for Advanced Microstructures and Devices (CAMD) and Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803
E. Ma
Affiliation:
Center for Advanced Microstructures and Devices (CAMD) and Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803
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Abstract

An X-ray absorption beamline has been developed recently at the electron storage ring of the LSU Center for Advanced Microstructures and Devices. Using Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Structure (XANES), we have studied the local atomic environments in immiscible mixtures processed by high-energy ball milling, a mechanical alloying technique involving heavy deformation. By examining the local coordination and bond distances, it is concluded that atomic-level alloying can indeed be induced between Cu and Fe through milling at room temperature, forming substitutional fcc and bcc solid solutions. In addition to single-phase regions, a two-phase region consisting of fcc/bcc solutions has been found after milling at both room temperature and liquid nitrogen temperature. In contrast to the Cu-Fe system, solid solution formation is not detectable in milled Ag-Fe and Cu-Ta mixtures. This work demonstrates the power of synchrotron EXAFS/XANES experiments in monitoring nonequilibrium alloying on the atomic level. At the same time, the results provide direct experimental evidence of the capability as well as limitations of high-energy ball milling to form alloys in positive-heat-of-mixing systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 524: Symposium V – Application of Synchrotron Radiation Techniques…IV , 1998 , 347
Copyright
Copyright © Materials Research Society 1998

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