مقاله Investigation of microstructure and wear properties of Al–۴?۵ wt.% TiC nanocomposites produced by mechanical milling

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بخشی از متن مقاله Investigation of microstructure and wear properties of Al–۴?۵ wt.% TiC nanocomposites produced by mechanical milling :

تعداد صفحات:۱۶
چکیده:

The present work deals with studies on the manufacturing and investigation of mechanical and wear behavior of aluminum alloy matrix composites (AAMCs), produced using powder metallurgy technique of ball milled mixing in a high energy attritor and using a blend–press–sinter methodology. Matrix of pre-mechanical alloyed Al–۴۵ wt.% Cu was used to which different fractions of nano and micron size TiC reinforcing particles (ranging from 0 to 10 wt.%) were added. The powders were mixed using a planetary ball mill. Consolidation was conducted by uniaxial pressing at 650 MPa. Sintering procedure was done at 400 C for 90 min. The results indicated that as TiC particle size is reduced to nanometre scale and the TiC content is increased up to optimum levels. The wear resistance of the composite increase significantly, whereas relative density, grain size and distribution homogeneity decrease. Microstructural characterization of the as-pressed samples revealed reasonably uniform distribution of TiC reinforcing particulates and presence of minimal porosity. The weartestdisclosed that the wear resistance of all specimens increases with the addition of nano and micronsize TiCparticles (up to 5 wt.%). Scanning electron microscopic observation of the worn surfaces was conducted and the dominant wear mechanism was recognized as abrasive wear accompanied by some delamination wear mechanism.