Abstract
Powder metallurgy components demand is increasing in the last few years mainly due to the necessity of products assigned to automotive and aerospace industries, which has allow an important development of aluminium alloys and composites (AMCs). Consolidation of aluminium alloys by sintering present a main problem: the oxide layer that cover aluminium particles. Several alternatives are studied in this work as solution to the oxide layer problem during the sintering of series 2xxx aluminium alloys. One of these solutions is related to the addition of tin traces, and the other is the addition of a second alloy. Moreover, aluminium metal matrix composites are characterized by excellent properties as combination of properties which comes from the matrix and from the reinforcement. The last part of this study is focused to the analysis of one aluminium matrix composite as the influence of several quantities of reinforcement.
Highlights
Powder metallurgy components demand is increasing in the last few years
which has allow an important development of aluminium alloys and composites
Several alternatives are studied in this work as solution
Summary
Han pasado ya más de 100 años desde que C.H. Hall descubriera un método comercial, relativamente barato, para la extracción de aluminio. En el Reino Unido, fabricantes de motores, como Rolls-Royce, desarrollaron la aplicación de aleaciones de aluminio para elevada temperatura basadas en el endurecimiento por precipitación del sistema Al-Cu [5]. La consolidación de aleaciones de aluminio mediante sinterización presenta un problema importante: el aluminio está siempre cubierto de una capa de óxido. La reacción se ve favorecida durante la sinterización ya que la difusión del magnesio a través de la matriz de aluminio puede venir acompañada de un cambio de volumen, creando así tensiones en la capa, que pueden llevar a que se rompa. La mayor parte de las investigaciones sobre los MMCs se han llevado a cabo para los materiales compuestos base aluminio (AMCs), con el objetivo de mejorar sus propiedades mecánicas mediante la incorporación de cerámicos tales como óxidos, carburos o nitruros en la matriz metálica[34-38]
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