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dc.contributor.advisorBergmann, Jean Pierrees_ES
dc.contributor.advisorRumiche Zapata, Francisco Aurelioes_ES
dc.contributor.authorRegensburg, Annaes_ES
dc.date.accessioned2015-08-13T00:37:59Zes_ES
dc.date.available2015-08-13T00:37:59Zes_ES
dc.date.created2012es_ES
dc.date.issued2015-08-12es_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12404/6225es_ES
dc.description.abstractOwing their wide range of exceptional properties, for example thermal conductivity values of more than 3000W/(mK) and strength in the range of 100 GPa, Carbon Nanotubes (CNTs) have recently gained much attention as reinforcement for composite materials. Considering the practical application in metal matrix composites (MMCs), tranferring those favourable properties from nano to macro scale represents a main challenge. Methods of the powder metallurgy route show promising results so far, but also lead to long process times and damage of the tublar structure of the CNTs due to prolonged ball milling times. At this point, the application of Friction Stir Processing (FSP) for fabricating CNT-reinforced MMCs offers the possibility to reduce process times and realize the required reinforcement at the relevant location of the component. The process uses a specially designed tool with a pin to plasticize the base material by frictional heating and thus incorporate the reinforcing material by stirring it into the workpiece. Investigations, that have been carried out on this subject, generally consider the unifom dispersion of the CNTs within the matrix as the key challenge of this process. So far, the solution herefore is the application of multipass-FSP in order to distribute the CNTs uniformly by processing the weld up to five times with alternating welding direction. This method usually leads to damage or even destruction of the tubular structure of the CNTs. Regarding all investigations on this subject, it can be noticed, that only conventional tool profiles like cylindrical or threaded were used for the experiments, though other profiles like square or more complex ones are considered to exhibit an increased mixing effect. Therefore the objective of the thesis is to analyse the performance of four different tool geometries under varying parameters and their influence on the CNT dispersion and general MMC composite properties. Channels were cut into an Al 5086 plate, filled with CNT-powder and processed by the different tools. The results were evaluated by metallographic analysis, hardness and electrical resistance measurement and SEM analysis. Among the different geometries, the triangular profile produced defect-free welds over the whole parameter set and distributed the CNTs uniformly along a wide area close to the weld surface.es_ES
dc.description.uriTesises_ES
dc.language.isoenges_ES
dc.publisherPontificia Universidad Católica del Perúes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rightsAtribución-NoComercial-SinDerivadas 2.5 Perúes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/pe/es_ES
dc.sourcePontificia Universidad Católica del Perúes_ES
dc.sourceRepositorio de Tesis - PUCPes_ES
dc.subjectSoldaduraes_ES
dc.subjectAluminio--Soldaduraes_ES
dc.titleDevelopment of friction stir processing of CNT - reinforced aluminum alloy compositeses_ES
dc.typeinfo:eu-repo/semantics/masterThesises_ES
thesis.degree.nameMagíster en Ingeniería Mecánicaes_ES
thesis.degree.levelMaestríaes_ES
thesis.degree.grantorPontificia Universidad Católica del Perú. Escuela de Posgradoes_ES
thesis.degree.disciplineIngeniería Mecánicaes_ES


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