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Electron microscopy investigation of the TiBAl and TiCAl grain refiner master alloys

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conference contribution
posted on 2006-01-01, 00:00 authored by Pavel CizekPavel Cizek
The present work brings a detailed statistical analysis of the microstructural characteristics and chemistry of the second phase particles present in the Al-5Ti-1B and Al- 3Ti-0.15C (wt.%) commercial grain refiner rods used in the Al casting industry. The investigation was performed using the TEM, EDS, STEM and HREM techniques. Both refiner rods contained large, blocky Al3Ti DO22particles. Borides present in the TiBAl rod, known to be main α-Al nucleation substrates, exhibited a facetted, hexagonal platelet morphology and largely represented a mixed (Ti,Al)B2phase, with Ti and Al contents changing continuously across the particle dimensions. There were two distinct families of small particles observed in the TiCAl rod. The coarser, facetted particles corresponded to cubic TiC crystal structure and these are believed to be major α-Al nucleation sites. The family of finer, round particles appeared to correspond to orthorhombic Al6Fe phase and their role in the nucleation process remains to be clarified. The results obtained may be used in optimising the grain refiner rod microstructures that would ensure improved refining performance during casting. © 2006 IOP Publishing Ltd.

History

Event

EMAG–NANO 05: Imaging, Analysis and Fabrication on the Nanoscale

Volume

26

Issue

1

Pagination

107 - 110

Publisher

IOP Publishing

Location

Leeds, Eng.

Place of publication

Bristol, Eng.

Start date

2005-08-31

End date

2005-09-02

ISSN

1742-6588

eISSN

1742-6596

Publication classification

EN.1 Other conference paper

Copyright notice

2006, IOP Publishing

Title of proceedings

Journal of Physics: Conference Series

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