INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Rolled Aluminium Matrix Composites and Composites by Rolling
Autor/es:
F. AUDEBERT; M. GALANO; X. JIANG
Lugar:
Cancun
Reunión:
Simposio; XX! International Symposium on Metastable and NanoMaterials; 2014
Institución organizadora:
ISMANAM
Resumen:
Metal Matrix Composites (MMCs) have become an important class of engineering materials because of the unique properties and higher performance they offer over traditional alloys. Some remarkable combination of properties of MMCs are the high specific strength and stiffness, better high temperature strength and stability in comparison to its base alloy, low coefficient of thermal expansion and satisfactory levels of corrosion resistance. Among MMCs, Aluminium based matrix composites (AMCs) have been the most developed and utilised for a wide range of engineering applications, particularly in aerospace, defence and automotive industry among others. Liquid processing techniques does not require high investments but have problems for inserting fine particles and for the reaction between Al matrix melt and particulates, also does not allow using metastable phase particles. Therefore powder metallurgy and plastic deformation processes, such extrusion, swaging, forging and rolling offer an excellent combination for manufacturing AMCs containing small reinforcement particles, metastable and metallic particles. Al alloy base matrix composites containing three different reinforcements have been produced and studied. One AMC containing 500nm SiC particles was produced by ball milling follow by hot isostatic pressing, hot extrusion and cold rolling. Other two AMCs containing either nanoquasicrystalline Al-base alloy particles with particle size under 25µm, or 100µm Nb particles were produced by powder mixing follow by cold compaction, hot extrusion and cold rolling. The microstructure including texture and substructure analysis was characterised by means of SEM, TEM, XRD and EBSD. It was observed that cold rolling process lead to obtain a homogeneous particle distribution of the AMCs containing SiC or quasicrystalline particles, and produce a fibrous microstructure in the metal-metal composite containing Nb particles. The mechanical properties were studied by microhardness and three point bending tests. The three composites are very promising high strength lightweight materials to be used as rolled sheet.