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A study of the transformation to the samarium-type structure in Gd-Ce alloys

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Abstract

The nature of the phase transformation to the rhombohedral samarium-type structure was studied in Gd-Ce alloys. The experimental techniques used were electrical resistance measurements, elevated-temperature X-ray diffraction studies, optical metallography, and transmission electron microscopy. Electrical resistance-temperature hysteresis loops were observed in two temperature regions. X-ray studies confirmed that the upper temperature behavior was due to the phase transformation (hcp ⇌ Sm-type or dhcp ⇌ Sm-type). The lower temperature hysteresis loop does not involve a change in crystal symmetry but does coincide with an increased rate in expansion of thea 0 parameter such that the axial ratio becomes essentially constant with temperature. Optical and electron microscopy revealed a morphology of fine parallel bands extending across a grain in a single variant. This is consistent with the transformation plane being the basal plane.

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Authors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.

    C. C. Koch (Group Leader)

  2. Atomic Energy Research Establishment, Harwell, England

    P. G. Mardon

  3. Metals and Ceramics Division, Oak Ridge National Laboratory, USA

    C. J. McHargue (Section Head)

Authors
  1. C. C. Koch
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  2. P. G. Mardon
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  3. C. J. McHargue
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Formerly on assignment at Oak Ridge National Laboratory.

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Koch, C.C., Mardon, P.G. & McHargue, C.J. A study of the transformation to the samarium-type structure in Gd-Ce alloys. Metall Trans 2, 1095–1100 (1971). https://doi.org/10.1007/BF02664241

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  • DOI: https://doi.org/10.1007/BF02664241

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