Effects of Milling Time on the Properties of In-Situ Binary Niobium-Titanium-Carbide Reinforced Cu Based Composite
Main Article Content
Abstract
Mechanical alloying was used to synthesize in-situ copper based composite reinforced by binary niobium-titanium-carbide from Cu, Nb, Ti and graphite powder mixture. The nominal composition was correponded to Cu-30 vol.% (Nb,Ti)C. XRD patterns showed that (Nb, Ti)C was not formed in the as-milled powder after 5 hours of milling but was precipitated with a subsequent sintering at 900°C. Milling time has showed a great influence on both mechanical and physical properties of the sintered composite pellets. Increasing milling time leads to an increase of the microhardness of the composite due to a higher degree of deformation that enhanced hardening. On the other hand, the electrical conductivity decreases considerably when the milling time increases. This phenomenon could be attributed to the increase of density of grain boundaries, which acts as a centre of electron scattering, with milling time.
Keywords
Cu, (Nb, Ti)C, Mechanical alloying, Sintering
Article Details
References
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[7] Z. Hussain, R. Othman, Bui D. L., Minoru U., Journal of Alloys and Compounds 464 (2008) 185-189.
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