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On the Mechanism of Milling Induced Disordering in AlFe

Published online by Cambridge University Press:  15 February 2011

M. T. Clavaguera-Mora ,
J. Zhu ,
M. Meyer ,
L. Mendoza-Zelis ,
F. H. Sanchez  and
N. Clavaguera
M. T. Clavaguera-Mora
Affiliation:
Grup de Física de Materials I, Dept. de Física, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.
J. Zhu
Affiliation:
Grup de Física de Materials I, Dept. de Física, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.
M. Meyer
Affiliation:
Departamento de Física, Universidad Nacional de La Plata, C.C.67,1900 La Plata, Argentina.
L. Mendoza-Zelis
Affiliation:
Departamento de Física, Universidad Nacional de La Plata, C.C.67,1900 La Plata, Argentina.
F. H. Sanchez
Affiliation:
Departamento de Física, Universidad Nacional de La Plata, C.C.67,1900 La Plata, Argentina.
N. Clavaguera
Affiliation:
Grup de Fisica de l'Estat Sòlid, Dept. ECM, Facilitai de Fisica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
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Abstract

The evolution of the B2-AlFe phase during mechanical grinding in Ar has been examined as a function of milling time by X-Ray diffraction, transmission Mössbauer spectroscopy and differential scanning calorimetry. Short and long range disorder was observed to increase with the mechanical treatment up to the attainment of a steady state. The evolution of the long range order parameter and of the local atomic configurations at Fe sites were analyzed in terms of possible mechanisms for milling induced disordering. The kinetics of the thermal reordering was studied under continuous heating and isothermal calorimetrie regimes. Modeling of the reordering processes by diffusion controlled growth of pre-existing ordered grains is presented as well as the estimated values of both the enthalpy and the activation energy of the reordering process. The results are consistent with a non uniform distribution of disorder throughout the sample and will be compared with preceding information on related systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 355
Copyright
Copyright © Materials Research Society 1997

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References

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