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Production of Al–Ti–C grain refiner alloys by reactive synthesis of elemental powders: Part I. Reactive synthesis and characterization of alloys

Published online by Cambridge University Press:  31 January 2011

H. J. Brinkman ,
F. Zupanič ,
J. Duszczyk  and
L. Katgerman
H. J. Brinkman
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137,2628 AL Delft, The Netherlands
F. Zupanič
Affiliation:
Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
J. Duszczyk
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137,2628 AL Delft, The Netherlands
L. Katgerman
Affiliation:
Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137,2628 AL Delft, The Netherlands
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Abstract

The first part of this article reports on the reactive synthesis and characterization of Al–Ti–C alloys intended as master alloys for aluminum grain refining. The alloys were produced from elemental powders by the thermal explosion mode and analyzed with x-ray diffraction, scanning electron microscopy, and differential scanning calorimetry. Parameters were the titanium concentration (15 and 30 wt%) and the Ti/C ratio (9/1, 20/1, and 120/1) in the reactant powder mixture and the cooling rate after the reactive synthesis (1 and 120 °C/min). Full conversion of titanium and carbon into Al3Ti and TiC was achieved for the 30 wt% Ti mixtures but not for the 15 wt% Ti mixtures where the reaction was not exothermic enough. The Ti/C ratio did not affect the phase composition after reactive synthesis in the 30 wt% Ti alloys and could be used to tailor the microstructure of the alloy. The formation of Al4C3 was suppressed with a high cooling rate after the exothermic formation reactions.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 12 , December 2000 , pp. 2620 - 2627
Copyright
Copyright © Materials Research Society 2000

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References

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