Abstract
Cu-Sn based alloy powders with additives of elemental Pb or C were densified by hot pressing technique. The influence of densifying on the properties of the hot pressed materials was investigated. The properties, such as the hardness, compressive strength, and wear resistance of these materials, were determined. The hot pressed Cu-Sn specimens included intermetallic/phases, which were homogeneously distributed. The presence of graphite improved the wear resistance of Cu-Sn alloys three times. Similarly, the presence of lead improved the densification parameter of Cu-Sn alloys three times. There was no significant difference in the mechanical behavior associated with the addition of Pb to the Cu-Sn alloys, although Cu-Pb alloys showed considerably higher ultimate strength and higher elongation. The Cu-Sn-C alloys had lower strength compared with those of Cu-Sn alloys. Evidence of severe melting spots was noticed in the higher magnifications of the compression fracture surface of 85% Cu-10% Sn-5% C and 80% Cu-10% Sn-10% Pb alloys. This was explained by the release of load at the final event of the fracture limited area.
Highlights
Metal matrix composites had attracted the interest of material scientists in the last few decades due to its unique properties [1, 2]
Cu-Sn alloys have been widely used as self-lubricant materials for many years [5], and powder metallurgy (PM) has been the main process to fabricate these alloys
The comparison between the pure Cu-Sn alloys shown in Figures 3(a) and 3(b) indicates the enhancement of diffusion and alloy formation as results of liquid phase sintering [29]
Summary
Metal matrix composites had attracted the interest of material scientists in the last few decades due to its unique properties [1, 2]. Copper reinforced with fine and uniform tin dispersoids has shown remarkable thermal and mechanical stability at an elevated temperature as reported by Xie et al [12]. They reported that the monotonic shear behavior of asreflowed Cu-Sn exhibits high strain to failure values [12]. Kim et al [14] introduced graphite to Cu-Sn alloys to improve thermal properties These new composites have proven to be very useful in the lithium ion Advances in Materials Science and Engineering batteries applications [15, 16]. The powder metallurgy (PM) processing technique has definite advantages when used for consolidation of prealloyed powders
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