Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 630, Issue -, Pages 117-125Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.11.193
Keywords
CuNb; Transition metal alloys; Mechanical alloying; High pressure torsion; Nanostructured materials; Nanoindentation
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Funding
- National Academy Keck Futures Initiative (NAKFI)
- Zukunftsfonds Steiermark [PN 6019]
- Austrian Science Fond FWF [P 25325-N20]
- Austrian Science Fund (FWF) [P 25325] Funding Source: researchfish
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New CuxNb1-x alloys were prepared using a two-step process of ball milling and subsequent high pressure torsion compacting at ambient temperature. The alloys showed a nanocrystalline structure with grain sizes between 13-26 nm for the Cu-rich samples and 11-13 nm for the Nb-rich samples. The grain sizes decreased with the milling time and the amount of Nb in the Cu-rich and Cu in the Nb-rich samples, respectively. The distortion of the crystallographic lattice of the fcc Cu and bcc Nb suggests the formation of a solid solution. The mechanical properties studied by nanoindentation show an increase of the hardness with milling time and the amount of added element. A thermal treatment was carried out under a protective Argon atmosphere. Up to 400 degrees C the Cu-rich samples do not show significant signs of oxidation and in increase of hardness. The Nb-rich samples showed a continuous increase of the hardness up to 500 degrees C, due to the precipitation of Cu, and the initial formation of NbOx. (C) 2015 Elsevier B.V. All rights reserved.
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