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Grain Refinement of γ-TiAl Based Alloys by Inoculation

Published online by Cambridge University Press:  01 February 2011

Daniel-Hendrik Gosslar ,
Robert Güenther ,
Christian Hartig ,
Rüediger Bormann ,
Julien Zollinger  and
Ingo Steinbach
Daniel-Hendrik Gosslar
Affiliation:
daniel.gosslar@tu-harburg.de, Hamburg University of Technology, Institute of Material Science and Technology, Hamburg, Germany
Robert Güenther
Affiliation:
r.guenther@tu-harburg.de, Hamburg University of Technology, Institute of Material Science and Technology, Hamburg, Germany
Christian Hartig
Affiliation:
hartig@tu-harburg.de, Hamburg University of Technology, Institute of Material Science and Technology, Hamburg, Germany
Rüediger Bormann
Affiliation:
bormann@tu-harburg.de, Hamburg University of Technology, Institute of Material Science and Technology, Hamburg, Germany
Julien Zollinger
Affiliation:
Julien.Zollinger@access.rwth-aachen.de, RWTH-Aachen, Access e.V, Aachen, Germany
Ingo Steinbach
Affiliation:
ingo.steinbach@rub.de, Ruhr-University Bochum, Interdisciplinary Centre for Advanced Materials Simulation, Bochum, United States
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Abstract

A significant grain refinement is achieved for a Ti-45Al (at.%) alloy via the addition of a novel Ti-Al-TiB2 master alloy. This refinement is attributed to a low lattice mismatch of TiB2 with the primary solidifying phase and its thermodynamic stability. Model calculations allow for the prediction of the grain size as a function of cooling rate, alloy constitution and particle size distribution and content. However, the model predictions are smaller than the experimentally observed grain size since the fraction of effective particles is overestimated.

Keywords

castinggrain sizesimulation

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References

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