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High temperature x-ray and calorimetric studies of phase transformations in quasicrystalline Ti–Zr–Ni alloys

Published online by Cambridge University Press:  31 January 2011

R. M. Stroud ,
K. F. Kelton  and
S. T. Misture
R. M. Stroud
Affiliation:
Physics Department, Washington University, St. Louis, Missouri 63130
K. F. Kelton
Affiliation:
Physics Department, Washington University, St. Louis, Missouri 63130
S. T. Misture
Affiliation:
High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

We present the first high temperature x-ray diffraction (HTXRD) studies of in situ quasicrystal-crystal and crystal-crystal transformations in Ti–Zr–Ni alloys. Together with differential scanning calorimetry studies, these x-ray measurements indicate three separate paths for the Ti–Zr–Ni quasicrystal-crystal transformation: single exothermic, single endothermic, or multiple endothermic. The mode of transformation depends on the alloy composition and the level of environmental oxygen. The crystalline products include the Ti2Ni, MgZn2 Laves, α−(Ti, Zr), and β−(Ti, Zr) phases. In the absence of oxygen, the endothermic transformation of the quasicrystal demonstrates that it is the lowest free energy (stable) phase at the Ti53Zr27Ni20 composition. Oxygen stabilizes the Ti2Ni phase, eliminating both the quasicrystal and the MgZn2 Laves phase, at partial pressures as low as a few hundred ppm.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 434 - 438
Copyright
Copyright © Materials Research Society 1997

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References

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