Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 617, Issue -, Pages 39-46Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.07.133
Keywords
Nanostructured materials; Cu-Cr pseudo-alloy; Mechanical alloying; Spark plasma sintering (SPS); SEM; TEM
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Funding
- Ministry of Education and Science of the Russian Federation [K2-2014-001, 14.575.21.0046]
- Notre Dame Integrated Imaging Facility (NDIIF)
- Defense Threat Reduction Agency (DTRA) [HDTRA1-10-1-0119]
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A set of nanocomposite Cu-Cr powders with the grain size of these immiscible metals below 5 nm were prepared by high-energy ball milling. The powders were then consolidated by short-term (5 min) spark plasma sintering at 700-900 degrees C under pressure (50 MPa) to obtain essentially pore-free pseudo-alloys. The grain sizes in the produced bulk materials remained within the ranges 5-60 nm for Cr-based phase and 200-300 nm for Cu-based matrix. These nanocomposites have a Vickers microhardness up to 3.9 GPa and a specific electrical resistivity in the range 6-9.6 mu Omega cm, which make them promising candidates for the application in high-voltage circuit breakers. (C) 2014 Elsevier B.V. All rights reserved.
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