Laves-type intermetallics have been observed to be the dominant phases in a series of alloy compositions being designed for the immobilization technetium in a metallic waste form. The dominant metals in the alloy compositions were Fe-Mo and Fe-Mo-Zr. Alloy composition, Fe-Mo-Zr, also contained Pd, Zr, Cr, and Ni. Both non-radioactive rhenium-containing and radioactive technetium-bearing alloy compositions were investigated. In the Fe-Mo series, phases were observed Fe2Mo (C14 Laves phase) and ferrite in agreement with predictions. Both Tc and Re resided predominantly in the Laves phase. In the Fe-Mo-Zr system, the phases included hexagonal C14 with the composition (Fe,Cr)2Mo, cubic C15 phase with a (Fe,Ni)2Zr composition, and the hcp phase Pd2Zr.
Revised: September 17, 2014 |
Published: January 23, 2013
Citation
Buck E.C., A.L. Schemer-Kohrn, and J.B. Wierschke. 2013.Technetium Incorporation into C14 and C15 Laves Intermetallic Phases. In Scientific Basis for Nuclear Waste Management XXXVI: Materials Research Society Fall Meeting, November 25-30, 2012, Boston, Massachusetts, 1518, 117-122. Boston, Massachusetts:Cambridge University Press.PNNL-SA-92573.doi:10.1557/opl.2013.69