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Microscopic View on Grain Nucleation and Growth Kinetics During Solidification of Aluminum Alloys

Published online by Cambridge University Press:  01 February 2011

N. Iqbal ,
N. H. van Dijk ,
S. E. Offerman ,
M. Moret ,
L. Katgerman  and
G. J. Kearley
N. Iqbal
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
N. H. van Dijk
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
S. E. Offerman
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands Department of Materials Science and Engineering, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
M. Moret
Affiliation:
ESRF, 6 Rue Jules Horowitz B. P. 220, F - 38043, Grenoble cedex, France
L. Katgerman
Affiliation:
Department of Materials Science and Engineering, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
G. J. Kearley
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
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Abstract

X-ray diffraction with hard X-rays (E = 70 keV) was used to investigate the grain nucleation and grain growth during solidification of a grain refined Al-0.3Ti-0.02B (wt.%) alloy. The investigations showed for the first time the nucleation profile during solidification and how nucleation rate increases with cooling rate. The results indicate that the nucleation process is complete for solid fraction below 30 %, irrespective of the cooling rate. This is explained in terms of the release of latent heat during solidification. The growth of individual aluminium grains during solidification is experimentally observed and compared to model predictions for the diffusion limited grain growth. The experimental results are only in agreement with the theory in the first stage of the transformation. The difference between the experiment and the theory is discussed qualitatively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 840: Symposium Q – Neutron and X-Ray Scattering as Probes of Multiscale Phenomena , 2004 , Q7.12
Copyright
Copyright © Materials Research Society 2005

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References

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