Despite the advantages of spark plasma sintering, it has so far been limited to the processing of... more Despite the advantages of spark plasma sintering, it has so far been limited to the processing of simple shapes, due to its inherent geometric configuration. This paper discusses the prospects and potential of spark plasma ''extrusion" as a process that can allow the production of extended geometries via electric-current processing. Results on the spark plasma extrusion and properties of aluminum are also discussed, showing the feasibility of this processing approach, which has major implications for the spark plasma sintering field.
Spark plasma sintering (SPS) is a process that has stimulated worldwide interest for the rapid co... more Spark plasma sintering (SPS) is a process that has stimulated worldwide interest for the rapid consolidation of powder-based materials through the combined effects of electric current and pressure. Recently the localization of SPS has been realized through current activated tip-based sintering (CATS) where electric current is selectively applied to small targeted regions of a green compact/powder bed via a precision controlled electrically conductive small tip. The unique tip-specimen geometry allows for locally controlled temperature and current distributions that can result in microstructural modifications on the micro-scale. The present paper presents for the first time the rapid processing and characterization of micro-scale functionally graded materials in relation to porosity content and size. The effects of initial green density and particle size on the developed micro-scale functionally graded material are discussed.
In the present work, we use mechanical alloying (MA) for the first time to generate a homogenous ... more In the present work, we use mechanical alloying (MA) for the first time to generate a homogenous distribution of 2wt% CNT within Al powders. The effect of milling time (up to 48h) on the morphological development of the powders and dispersion of CNTs was investigated. The results show that the technique is effective in dispersing the nanotubes within the soft Al matrix which simultaneously protects the nanotubes from damage under the impact of the milling balls.
Despite the advantages of spark plasma sintering, it has so far been limited to the processing of... more Despite the advantages of spark plasma sintering, it has so far been limited to the processing of simple shapes, due to its inherent geometric configuration. This paper discusses the prospects and potential of spark plasma ''extrusion" as a process that can allow the production of extended geometries via electric-current processing. Results on the spark plasma extrusion and properties of aluminum are also discussed, showing the feasibility of this processing approach, which has major implications for the spark plasma sintering field.
Spark plasma sintering (SPS) is a process that has stimulated worldwide interest for the rapid co... more Spark plasma sintering (SPS) is a process that has stimulated worldwide interest for the rapid consolidation of powder-based materials through the combined effects of electric current and pressure. Recently the localization of SPS has been realized through current activated tip-based sintering (CATS) where electric current is selectively applied to small targeted regions of a green compact/powder bed via a precision controlled electrically conductive small tip. The unique tip-specimen geometry allows for locally controlled temperature and current distributions that can result in microstructural modifications on the micro-scale. The present paper presents for the first time the rapid processing and characterization of micro-scale functionally graded materials in relation to porosity content and size. The effects of initial green density and particle size on the developed micro-scale functionally graded material are discussed.
In the present work, we use mechanical alloying (MA) for the first time to generate a homogenous ... more In the present work, we use mechanical alloying (MA) for the first time to generate a homogenous distribution of 2wt% CNT within Al powders. The effect of milling time (up to 48h) on the morphological development of the powders and dispersion of CNTs was investigated. The results show that the technique is effective in dispersing the nanotubes within the soft Al matrix which simultaneously protects the nanotubes from damage under the impact of the milling balls.
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Papers by Khaled Morsi