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Formation kinetics of nanocrystalline Fe–4 wt.% Al solid solution during ball milling

Published online by Cambridge University Press:  31 January 2011

H. G. Jiang ,
R. J. Perez ,
M. L. Lau  and
E. J. Lavernia
H. G. Jiang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California–Irvine, Irvine, California 92717–2575
R. J. Perez
Affiliation:
Department of Chemical Engineering and Materials Science, University of California–Irvine, Irvine, California 92717–2575
M. L. Lau
Affiliation:
Department of Chemical Engineering and Materials Science, University of California–Irvine, Irvine, California 92717–2575
E. J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California–Irvine, Irvine, California 92717–2575
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Abstract

Formation of nanocrystalline Fe–4 wt.% Al solid solution has been achieved through SPEX ball milling of blended elemental Fe and Al powders. Differential scanning calorimetry (DSC) and x-ray diffraction (XRD) have been employed to follow the structural evolution during the ball-milling process. Exothermic peaks exhibited in DSC diagrams of the powders milled for 10 to 60 min yielded thermal enthalpies corresponding to the formation of Fe–4 wt.% Al solid solution, from which the kinetics of formation were found to follow the Johnson–Mehl–Avrami equation. Assessment of the kinetic parameter n reveals a diffusion controlled mechanism, in which grain and interphase boundaries may play a crucial role, during the solid solution formation of Fe–4 wt.% Al.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 6 , June 1997 , pp. 1429 - 1432
Copyright
Copyright © Materials Research Society 1997

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