Point Defects in Binary Laves-Phase Alloys

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Point defect mechanisms in the binary C15 NbCr{sub 2} and NbCo{sub 2}, and C14 NbFe{sub 2} systems on both sides of stoichiometry was studied and clarified by both bulk density and X-ray lattice parameter measurements. It was found that the vacancy concentrations in these systems after quenching from 1000 C are essentially zero. The constitutional defects on both sides of stoichiometry for these systems were found to be of the anti-site type in comparison with the model predictions. However, thermal vacancies exhibiting a maximum at the stoichiometric composition were obtained in NbCr{sub 2} laves phase alloys after quenching from 1400 ... continued below

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24 p.

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Liaw, P.K.; Liu, C.T.; Pike, L.M. & Zhu, J.H. November 30, 1998.

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Point defect mechanisms in the binary C15 NbCr{sub 2} and NbCo{sub 2}, and C14 NbFe{sub 2} systems on both sides of stoichiometry was studied and clarified by both bulk density and X-ray lattice parameter measurements. It was found that the vacancy concentrations in these systems after quenching from 1000 C are essentially zero. The constitutional defects on both sides of stoichiometry for these systems were found to be of the anti-site type in comparison with the model predictions. However, thermal vacancies exhibiting a maximum at the stoichiometric composition were obtained in NbCr{sub 2} laves phase alloys after quenching from 1400 C. These could be completely eliminated by annealing at 1000 C. Anti-site hardening was found on both sides of stoichiometry for all three Laves phase systems studied. Furthermore, the thermal vacancies in NbCr{sub 2} alloys after quenching from 1400 C were found to soften the Laves phase. The anti-site hardening of the Laves phases is similar to that of the B2 compounds, while the thermal vacancy softening is unique to the Laves phase. Both the anti-site defects and thermal vacancies do not significantly affect the fracture toughness of the Laves phases.

Physical Description

24 p.

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OSTI as DE00003626

Medium: P; Size: 24 pages

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  • Fall Meeting of the Materials Research Society, Boston, MA (US), 11/30/1998--12/04/1998

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  • Report No.: ORNL/CP-101129
  • Report No.: KC 02 01 05 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 3626
  • Archival Resource Key: ark:/67531/metadc688062

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  • November 30, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 10, 2017, 4:43 p.m.

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Liaw, P.K.; Liu, C.T.; Pike, L.M. & Zhu, J.H. Point Defects in Binary Laves-Phase Alloys, article, November 30, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc688062/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.