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The Effect of Erbium Additions on the Solidification Behavior of γ-Tial

Published online by Cambridge University Press:  22 February 2011

B. Timothy Bassler ,
M. V. Kral ,
W. H. Hofmeister  and
R. J. Bayuzick
B. Timothy Bassler
Affiliation:
Vanderbilt University, Dept. of Applied and Engineering Sciences, Box 1593 Station B, Nashville, TN, 37235.
M. V. Kral
Affiliation:
Vanderbilt University, Dept. of Applied and Engineering Sciences, Box 1593 Station B, Nashville, TN, 37235.
W. H. Hofmeister
Affiliation:
Vanderbilt University, Dept. of Applied and Engineering Sciences, Box 1593 Station B, Nashville, TN, 37235.
R. J. Bayuzick
Affiliation:
Vanderbilt University, Dept. of Applied and Engineering Sciences, Box 1593 Station B, Nashville, TN, 37235.
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Abstract

The titanium-aluminum-erbium system has been studied using electromagnetic levitation and ultra high speed imaging in order to quantify the solidification velocity as a function of undercooling. Measurements were made on Ti-60 at% Al alloys with 0.25, 0.5, 1.0, and 2.0 at% Er additions. Boettinger and Aziz1 show that in ordered alloys it is thermodynamically possible at large enough interface velocities, corresponding to large undercoolings, to solidify a disordered phase with the same composition as the liquid. The result of the transition from ordered to disordered solidification is a discontinuity in the relationship between solidification velocity and melt undercooling. The experimental results for the solidification velocity as a function of melt undercooling will be presented and discussed for each alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1011
Copyright
Copyright © Materials Research Society 1995

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References

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