Effect of milling conditions on the properties of Cu-NbC alloys obtained by powder metallurgy
DOI:
https://doi.org/10.3989/revmetalm.2006.v42.i5.30Keywords:
Strengthening of copper composite materials, Powder metallurgy, Mechanical and electrical, propertiesAbstract
Copper-base composite materials were obtained by reinforcing with homogeneous dispersions of 0.5 and 1% vol. of very fine NbC particles, through mechanical milling process in a planetary mill during 8 and 24 h at two different rotational speeds. The consolidation of the alloyed reinforced particles was achieved through a hot uniaxial pressing at 923K under 90 MPa during 2 h under a protective argon atmosphere. Factors to the suitable combination of electrical conductivity and mechanical properties attained are the hardness and good thermal stability of the niobium carbide which affords further refinement in the size of copper particles and the reinforcement of the alloy. A lower embrittlement and higher electrical conductivity of this alloy was observed, as a consequence of the smaller amount of impurities (Fe, Cr, C and O) incorporated during the lower-energy milling. Scanning and transmission electron microscopy and X-ray diffraction show an additional strengthening of the grain substructure by precipitation of nanometer-size impurities.
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