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Phase and Microstructure of Fe Modified A13 Ti

Published online by Cambridge University Press:  26 February 2011

W. D. Porter ,
K. Hisatsune ,
C. J. Sparks ,
W. C. Oliver  and
W. C. Oliver
W. D. Porter
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6117
K. Hisatsune
Affiliation:
School of Dentistry, Nagasaki University, Nagasaki 852, Japan
C. J. Sparks
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6117
W. C. Oliver
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6117
W. C. Oliver
Affiliation:
E. I. du Pont, Chattanooga, TN 37415
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Abstract

Alloys of Al75-xFexTi25, where x = 0 to 12 at. % Fe, were fabricated by splat cooling and examined primarily with X-ray diffraction to determine the crystallographic phases present, their composition, volume fraction, lattice parameters, and sublattice occupation. The tetragonal DO22 structure of Al3Ti dissolved 0.8 ± 0.4 at. % Fe, with additional iron partitioned to the Ll2 structure containing 6.2 ± 0.4 at. % Fe, and completed the transformation to the Ll2 structure with the addition of about 6 at. % Fe. The lattice parameters of both phases were independent of iron concentration up to about 6 at. %. At 8 at. % Fe, the iron was found to be predominantly distributed on the nominal aluminum sublattice which also contained about 5 at. % Ti. The Al3 Ti composition was similarly found to contain about 5 at. % Ti on the aluminum sublattice. All compositions, including a single crystal of Al67Fe8 Ti25, were found to be brittle.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 657
Copyright
Copyright © Materials Research Society 1989

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References

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