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TEM studies of the ternary Ti36 Al62 Nb2 alloy

Published online by Cambridge University Press:  04 February 2011

V.S.K. Chakravadhanula ,
K. Kelm ,
L. Kienle ,
V. Duppel ,
A. Lotnyk ,
D. Sturm ,
M. Heilmaier ,
G. J. Schmitz ,
A. Drevermann  and
F. Stein
...Show all authors
V.S.K. Chakravadhanula
Affiliation:
Christian-Albrechts University Kiel, Institute for Materials Science, Synthesis and Real Structure, D-24143 Kiel, Germany
K. Kelm
Affiliation:
German Aerospace Center, Institute of Materials Research, D-51147 Cologne, Germany
L. Kienle
Affiliation:
Christian-Albrechts University Kiel, Institute for Materials Science, Synthesis and Real Structure, D-24143 Kiel, Germany
V. Duppel
Affiliation:
Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
A. Lotnyk
Affiliation:
Christian-Albrechts University Kiel, Institute for Materials Science, Synthesis and Real Structure, D-24143 Kiel, Germany
D. Sturm
Affiliation:
Otto-von-Guericke University Magdeburg, Institute for Materials Joining and Technology, D-39104 Magdeburg, Germany
M. Heilmaier
Affiliation:
Technical University Darmstadt, Physical Metallurgy, D-64287 Darmstadt, Germany
G. J. Schmitz
Affiliation:
ACCESS e.V., D-52072 Aachen, Germany
A. Drevermann
Affiliation:
ACCESS e.V., D-52072 Aachen, Germany
F. Stein
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany
M. Palm
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany
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Abstract

Al-rich Ti-Al alloys attracted some attention during the past years due to the possibility of their application as light-weight, high-performance materials at elevated temperatures. The effect of the addition of Nb to Al-rich Ti-Al alloys has been studied for Ti36 Al62 Nb2 by a combined approach of transmission electron microscopy (TEM) techniques for unraveling the structure and composition at the nanoscale. Structural analyses on as-cast ternary alloys revealed the presence of h-TiAl2-, Ti3Al5- and γ-TiAl-type phases. After heat treatment, phase transformations like the replacement of the metastable h-TiAl2-type by the stable r-TiAl2-type were identified. Additionally, changes of the microstructural features like the formation of interfaces with different orientation relationships are apparent. The orientation and interfacial relationships involved are compared to those of binary Ti-Al alloys rich in Al.

Keywords

transmission electron microscopy (TEM)structuralmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n03-09
Copyright
Copyright © Materials Research Society 2011

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References

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