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HREM Analysis of TiB2 - Ti3B4 Precipitates Grown in-Situin TiAl

Published online by Cambridge University Press:  02 July 2020

B.J. Inkson  and
M. Rühle
B.J. Inkson
Affiliation:
Max-Planck-Institut für Metallforschung, Seestrasse 92, D-70174, Stuttgart, Germany
M. Rühle
Affiliation:
Max-Planck-Institut für Metallforschung, Seestrasse 92, D-70174, Stuttgart, Germany
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Extract

TiAl alloys are being developed for future use as lightweight, high strength structural materials for the aerospace and automotive industries. The growth of titanium borides in-situ in a TiAl melt can lead to a variety of structures, such as TiB (Bf and B27 structures) and TiB2, depending on the Ti/Al ratio in the melt, and on the presence of further alloying additions [1,2]. The morphologies of the boride particles can be significantly altered if they grow coupled with other boride or intermetallic phases [2-4]. Since the morphology and distribution of the borides with the intermetallic matrix can significantly affect their effectiveness as creep reinforcements, the structures and growth mechanisms of these composites need to be quantified at the atomic scale.

In a Ti-45.5at.%Al-1.6at.%Fe-l.lat.%V-0.7at.%B alloy know to contain TiB2 precipitates [2,3], the morphology of the boride particles have been investigated using HREM. The Stuttgart JEOL-ARM, operated at 1250kV using the side-entry pole-piece with 0.12nm point resolution, enables the distinction between individual boron and titanium columns in the titanium borides to be achieved for the first time.

Type
Atomic Structure and Mechanisms at Interfaces in Materials
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 625 - 626
Copyright
Copyright © Microscopy Society of America 1997

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References

De Graef, M., et al., Acta metall. mater., (1992) 40, 12, 3395.10.1016/0956-7151(92)90053-HCrossRefGoogle Scholar
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Inkson, B.J., Boothroyd, C.B. and Humphreys, C.J., Acta metall. mater., (1995) 43, 1429.10.1016/0956-7151(94)00345-ICrossRefGoogle Scholar
Inkson, B.J., Mö bus, G. and Rühle, M., MRS Symp. Proc., (1997) in press.Google Scholar
The authors gratefully acknowledge the Alexander von Foundation, Bonn for a Research Fellowship and the Max-Planck-Institut for research support.Google Scholar