Phase stability in Be-Nb and Be-Nb-Zr intermetallics

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Sputter deposition of Be-Nb alloys at low temperature (30{degrees}C) produces an amorphous phase for compositions >5 at.% Nb. A metastable crystalline phase which can be considered a highly faulted form of the Be{sub 12}Nb occurs at higher deposition temperatures or by low-temperature annealing of the amorphous phase. Because of structural similarities, this metastable phase is a precursor to the formation of either Be{sub 12}Nb or Be{sub 17}Nb{sub 2} upon high temperature annealing. There was no evidence of the Be{sub 5}Nb phase which has been postulated on some phase diagrams. The Be{sub 12}Nb phase can accomodate considerable Zr in the structure ... continued below

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Brimhall, J.L.; Charlot, L.A. & Bruemmer, S.M. September 1, 1991.

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Sputter deposition of Be-Nb alloys at low temperature (30{degrees}C) produces an amorphous phase for compositions >5 at.% Nb. A metastable crystalline phase which can be considered a highly faulted form of the Be{sub 12}Nb occurs at higher deposition temperatures or by low-temperature annealing of the amorphous phase. Because of structural similarities, this metastable phase is a precursor to the formation of either Be{sub 12}Nb or Be{sub 17}Nb{sub 2} upon high temperature annealing. There was no evidence of the Be{sub 5}Nb phase which has been postulated on some phase diagrams. The Be{sub 12}Nb phase can accomodate considerable Zr in the structure and the Be{sub 13}Zr can accomodate Nb into its structure. The Be{sub 13}Zr becomes the predominant phase when the Zr/Nb composition ratio > 1. High temperature annealing of the ternary results in dual-phase regions of Be{sub 12}(Nb,Zr) + Be{sub 17}(NbZr){sub 2} or Be{sub 13}(Zr,Nb) + Be{sub 17}(Zr,Nb){sub 2}, but the coexistence of Be{sub 12}(Nb,Zr) + Be{sub 13}(Zr,Nb) has not been observed. 10 refs., 5 figs.

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Pages: (19 p)

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OSTI; NTIS; GPO Dep.

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  • International conference on high temperature aluminides and intermetallics, San Diego, CA (United States), 17-19 Sep 1991

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  • Other: DE92002146
  • Report No.: PNL-SA-19088
  • Report No.: CONF-910938--6
  • Grant Number: AC06-76RL01830
  • Office of Scientific & Technical Information Report Number: 5061121
  • Archival Resource Key: ark:/67531/metadc1061754

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  • September 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 31, 2018, 1 p.m.

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Brimhall, J.L.; Charlot, L.A. & Bruemmer, S.M. Phase stability in Be-Nb and Be-Nb-Zr intermetallics, article, September 1, 1991; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1061754/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.