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Containerless solidification studies of the α–1/1 crystal approximant in Ti–Cr–Si–O alloys

Published online by Cambridge University Press:  31 January 2011

T. K. Croat ,
K. F. Kelton ,
D. Holland-Moritz ,
T. J. Rathz  and
M. B. Robinson
T. K. Croat
Affiliation:
Department of Physics, Washington University, Box 1105, Saint Louis, Missouri 63130
K. F. Kelton
Affiliation:
Department of Physics, Washington University, Box 1105, Saint Louis, Missouri 63130
D. Holland-Moritz
Affiliation:
Institut für Raumsimulation, Deutsches Zentrum für Luft und Raumfahrt, Linder Höhe, D-51147, Köln, Germany, and Division of Engineering and Applied Sciences, Harvard University, Gordon McKay Laboratory, 9 Oxford Street, Cambridge, Massachusetts 02138
T. J. Rathz
Affiliation:
University of Alabama, Huntsville, Alabama 35899
M. B. Robinson
Affiliation:
Space Sciences Laboratory, NASA/Marshall Space Flight Center, Huntsville, Alabama 35812
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Abstract

The nucleation behavior of α(TiCrSiO), a 1/1 Fibonacci crystal approximant phase, was investigated in alloys made near the stoichiometric composition. Containerless solidification studies were made with electromagnetic radio-frequency levitation and the 105-m NASA Drop Tube. The solidification microstructures indicate that the α–Ti hexagonal solid solution was the primary crystallizing phase in these alloys, growing dendritically. The α(TiCrSiO) phase nucleated in the remaining liquid. The competition between these two phases resulted from the high oxygen concentration needed to form α(TiCrSiO), which also stabilized the hexagonal-close-packed α–Ti phase.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4208 - 4213
Copyright
Copyright © Materials Research Society 1999

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References

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