Structural changes in columbium alloy in creep tests in vacuo

Creep of Nb-base alloys with Zr, Mo, or W additions was studied at 1100/sup 0/C in vacuum. It was found that Nb alloy containing zirconium becomes saturated with oxygen in creep tests at a vacuum of 4 x 10/sup -5/ mm Hg at 1100/sup 0/C, leading to evolution of zirconium oxides on the grain boundarie...

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Veröffentlicht in:	Strength Mater. (USSR) (Engl. Transl.); (United States) 1975-04, Vol.7 (4), p.520-522
Hauptverfasser:	Rybakov, S. V., Shatinskii, V. F., Eliseev, A. I.
Format:	Artikel
Sprache:	eng
Schlagworte:	360102 - Metals & Alloys- Structure & Phase Studies ADSORPTION ALLOYS CARBON COMPOUNDS CARBON MONOXIDE CARBON OXIDES CHALCOGENIDES CREEP CRYOGENIC FLUIDS ELEMENTS FLUIDS HIGH VACUUM HYDROGEN MATERIALS SCIENCE MECHANICAL PROPERTIES MOLYBDENUM ADDITIONS MOLYBDENUM ALLOYS NIOBIUM ALLOYS NIOBIUM BASE ALLOYS NITROGEN NONMETALS OXIDES OXYGEN OXYGEN COMPOUNDS PHASE TRANSFORMATIONS SORPTION TUNGSTEN ADDITIONS TUNGSTEN ALLOYS ZIRCONIUM ALLOYS
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Zusammenfassung:	Creep of Nb-base alloys with Zr, Mo, or W additions was studied at 1100/sup 0/C in vacuum. It was found that Nb alloy containing zirconium becomes saturated with oxygen in creep tests at a vacuum of 4 x 10/sup -5/ mm Hg at 1100/sup 0/C, leading to evolution of zirconium oxides on the grain boundaries. Resistance to creep increases in these circumstances. When Nb alloy is saturated with oxygen, the main body of metal loses zirconium as a result of its diffusion to the test-piece surface. The diffusion coefficient of oxygen in Nb as a result of interaction with the residual atmosphere in the vacuum chamber (P = 4 x 10/sup -5/ mm Hg, t = 1100/sup 0/C) at an applied stress of 4 to 10 kgf/mm/sup 2/ was 1.12 x 10/sup -6/ cm/sup 2/. (JRD)
ISSN:	0039-2316 1573-9325
DOI:	10.1007/BF01522880