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High-energy grinding of FeMo powders

Published online by Cambridge University Press:  31 January 2011

M. D’Incau ,
M. Leoni  and
P. Scardi
M. D’Incau
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38100 Trento, Italy
M. Leoni
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38100 Trento, Italy
P. Scardi*
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38100 Trento, Italy
*
a)Address all correspondence to this author. e-mail: Paolo.Scardi@unitn.it
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Abstract

Iron-molybdenum powders ground in a planetary ball mill under different operating conditions were studied by x-ray diffraction line profile analysis using a recently developed whole powder pattern modeling approach. The evolution of the microstructure, expressed in terms of size distribution of coherent scattering domains, average dislocation density, and edge/screw character, shows the importance of the main process parameters: the ratio between jar and main disk rotation speeds, and ball milling time. A characteristic three-stage process is observed, with work hardening followed by particle flattening/bending before nanocrystalline grains form by a fragmentation process triggered by localized deformation. The relationship between lattice defect density and domain size suggests a progressive transition between statistically stored to geometrically necessary dislocations, with the latter mostly present as excess dislocations at the nanodomain boundary.

Keywords

MicrostructureNanostructureX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1744 - 1753
Copyright
Copyright © Materials Research Society2007

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References

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