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The Influence of the Purity and Thickness of Niobium Foils on its Mechanical Properties
Author(s) -
Savitsky E. M.,
Efimov Yu. V.,
Galperovich D. Ja.,
Korzhakova T. V.,
Rjabtzev L. A.,
Shapovalov Yu. P.,
Brovko A. P.
Publication year - 1986
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170210130
Subject(s) - foil method , niobium , materials science , annealing (glass) , etching (microfabrication) , microstructure , surface layer , electrical resistivity and conductivity , composite material , metallurgy , volume (thermodynamics) , nitrogen , layer (electronics) , chemistry , physics , organic chemistry , quantum mechanics , electrical engineering , engineering
The content of contaminants, microstructures, surface condition, electrical resistivity and mechanical properties of niobium foils and bands (13–1000 μm thick) after cold working (90–99.9%), surface etching and heat treatment under vacuum (0.001 Pa at 700–1200 °C for 1–5 hrs) are studied. The effect of the previous working and different environmental conditions including initial and acquired surface contamination with oxygen, carbon, nitrogen and iron increases noticeably with the rise of the working degree and decrease of the foil thickness. The mechanical properties of foils and bands (≧ 100 μm) practically don't differ from massive standard samples. At the foil thickness of ≦ 40 μm the dimensional effects and the influence of the surface layer are especially noticeably. The optimal combination of the whole complex of surface and volume properties at the minimum dimensional effects is observed on the 50 μm thick foil. The improvement of foil properties can be achieved due to etching its surface layer up to the depth not less than 4 μm (on each side) after the cold working and following annealing at 1000–1100 °C (1–3 hrs).