Fabrication And Characterisation Of Copper Composites Reinforced With Transition Metal Carbides Via Mechanical Alloying

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dc.contributor.authorMohd Subhi, Nur Hawadah
dc.date.accessioned2018-06-22T07:55:54Z
dc.date.available2018-06-22T07:55:54Z
dc.date.issued2011-01
dc.description.abstractIn this study, high-energy ball milling also called mechanical alloying (MA) was applied to synthesis in situ copper based composite. Cu, M (M=W or Ti) and graphite powder mixture were mechanically alloyed for various milling time in a planetary ball mill. The nominal composition was Cu-28.72wt%W-1.87wt%C and Cu-9.67wt%Ti-2.42wt%C which corresponds to Cu-20vol%WC and Cu-20vol%TiC, respectively. With similar composition and milling time, the ex situ WC and TiC reinforced copper composite was also mixed by ball milling. Then the as-milled powder for both in situ and ex situ composites were compacted at 200 to 400 MPa and sintered in vacuum furnace at 900ÂșC. The results of X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy analysis showed that formation of tungsten carbide (W2C and WC phases) observed after sintering of Cu-W-C composite while TiC precipitated in as-milled powder of Cu-Ti-C composite after 5 h and become amorphous with longer milling. Mechanism of MA explained the cold welding and fracturing event during milling. Cu- W-C system shows fracturing event is more dominant at early stage of milling and W particle still existed after milling up to 60 h. While in Cu-Ti-C system, cold welding is more dominant and all Ti particles dissolved into Cu matrix. These phenomena results in increased the microhardness properties of both in situ Cu-W-C and Cu-Ti-C composite and decreased in electrical conductivity by increasing the milling time. Higher microhardness and lower electrical conductivity are obtained in both in situ composite compared to ex situ composite due to the effect of MA and the fine carbides particles precipitation.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5761
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectMechanical alloying (MA) was applieden_US
dc.subjectto synthesis in situ copper based compositeen_US
dc.titleFabrication And Characterisation Of Copper Composites Reinforced With Transition Metal Carbides Via Mechanical Alloyingen_US
dc.typeThesisen_US
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