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Time-resolved studies of the order–disorder phase transformations in rare-earth–transition metal intermetallics with 2-17 stoichiometry

Published online by Cambridge University Press:  31 January 2011

Y.Y. Kostogorova-Beller ,
M.J. Kramer  and
J.E. Shield
Y.Y. Kostogorova-Beller*
Affiliation:
Department of Engineering Mechanics, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0526
M.J. Kramer
Affiliation:
Iowa State University, Materials Science and Engineering, Ames, Iowa 50011-3020
J.E. Shield
Affiliation:
Department of Mechanical Engineering, University of Nebraska—Lincoln, Lincoln, Nebraska 68588
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

High-temperature order–disorder transformations in R2T17 and R2T17-M-C intermetallics with R = Pr, Sm, Dy, Tb; T = Co, Fe; and M = Zr, Nb were studied utilizing time-resolved synchrotron x-ray diffraction at the Advanced Photon Source (APS) at the U.S. Department of Energy’s Argonne National Laboratory (Argonne, IL). High-energy synchrotron radiation provides intense, highly penetrating x-rays, which are ideal for in situ studies of phase transformations. Alloying additions are used to stabilize formation of metastable phases; their influence on order recovery was investigated. The experimental setup utilized Debye–Scherrer geometry; specimens were heated at a rate of 10 K/min. Full-profile diffraction patterns collected every 10 s were refined in sequence using the Rietveld method to track changes of lattice parameters and phase assemblages during heating. Sharp changes observed in the evolution of temperature-dependent lattice parameters suggested formation of ordered structure via nucleation and growth. Both 2-17 polymorphs co-existed in light and heavy rare-earth systems at high temperatures. The presence of alloying additions in the solid solution greatly influenced long-range order formation.

Keywords

Phase transformationRapid solidificationX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 2886 - 2896
Copyright
Copyright © Materials Research Society 2008

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References

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