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Characterization of Laser-Deposited TiAl Alloys

Published online by Cambridge University Press:  10 February 2011

X. D. Zhang ,
C. Brice ,
R. J. Grylls ,
D. J. Evans  and
H. L. Fraser
X. D. Zhang
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
C. Brice
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
R. J. Grylls
Affiliation:
Now at GE Aircraft Engines, Evendale OH
D. J. Evans
Affiliation:
SWL/MLLM, Wright Laboratory, Dayton, OH
H. L. Fraser
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210
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Abstract

Microstructure of TiAl produced by Laser Engineered Net Shaping (LENS) has been characterized using optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It has been shown that the substrate has a significant effect on the microstructure deposited. Depending on operational parameters, either equiaxed γ-TiAl/α2 -Ti3AI or single phase α 2 microstructure can be obtained. In-situ heating experiments reveal that nucleation of lamellae often starts at grain boundaries in this retained α 2grains. By careful control of post heat treatment, an ultra fine lamellar microstructure may be obtained, which may significantly improve tensile property in these alloys [3].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.2.1
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

1. Griffith, M. L., Keicher, D. M., Atwood, C. L., Romero, J. A., Smugeresky, J. E., Harwell, L. D. and Greene, D. L., Proc. Solid Freeform Fabrication, The University of Texas, 121, 1996 Google Scholar
2. Kim, Y-W., Mater. Sci. Eng., A192/A193, 519, 1995 CrossRefGoogle Scholar
3. Liu, C. T., Schneibel, J. H., Maziasz, P. J., Wright, J. L. and Easton, D. S., Intermetallics, 4, 429, 1996 CrossRefGoogle Scholar