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Phase Stability in Binary Ti-Al

Published online by Cambridge University Press:  28 February 2011

C.D. Anderson ,
W.H. Hofmeister  and
R.J. Bayuzick
C.D. Anderson
Affiliation:
Vanderbilt University Center for Space Processing of Engineering Materials, Box 6309 B, Nashville, TN 37235
W.H. Hofmeister
Affiliation:
Vanderbilt University Center for Space Processing of Engineering Materials, Box 6309 B, Nashville, TN 37235
R.J. Bayuzick
Affiliation:
Vanderbilt University Center for Space Processing of Engineering Materials, Box 6309 B, Nashville, TN 37235
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Abstract

Binary Ti-Al samples containing from 46 to 54 at.% Al were solidified while undercooled by various amounts using electromagnetic levitation techniques. A detailed thermal history of these samples was obtained with sampling rates as high as 500 KHz during recalescence. This very high sampling rate was essential to resolve the thermal events. Primary α solidification was observed in samples containing from 51 to 54 at.% Al that were undercooled less than about 100 K at solidification. Primary β solidification was found for all undercoolings tested in samples containing less than 51 at.% Al and for undercoolings greater than about 100 K in samples containing 51 to 54 at.% Al. These first two observations are in agreement with results from Valencia et al. for Ti-45 at.% Al and Ti-50 at.% Al, respectively [4]. However, the third observation of β as the primary solidification structure at high undercooling and 54 at.% Al differs from Valencia's interpretation for Ti-55 at.% Al. The results in this study are consistent with the proposed McCullough Ti-Al phase diagram.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 147
Copyright
Copyright © Materials Research Society 1991

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References

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