INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A step change in Al based nanostructured alloys and composites
Autor/es:
M. GALANO; F. AUDEBERT; S. PEDRAZZINI; A. KNOWLES
Lugar:
Hyderabad
Reunión:
Seminario; Indo-UK Joint Seminar on Functional and Energy Materials, Manufacturing and Structures (FAEMMS 2013); 2013
Resumen:
Different nanostructured Al-based alloys and composites have been developed in the recent years containing several types of reinforcements at the nano-scale dimensions to enhance the mechanical behaviour. The use of rapid solidification techniques has also made it possible to obtain microstructures combining amorphous, crystalline and quasicrystalline phases that provide an excellent combination of properties. However, these materials have rarely made it into industry due to the difficulties in scaling up the production to make it relevant for industrial applications without the detriment of the mechanical properties. Novel nanostructured Al alloys and nanocomposites containing quasicrystalline phases at the nano-scale and Al particles at the micro-scale were obtained through manufacturing processes scalable up to a near industrial scale by means powder metallurgy. These nanocomposites show a superior combination of mechanical properties than current commercial Al-based composites showing a remarkable enhancement of properties at elevated temperatures. The microstructural analysis was carried out using SEM, EBSD, EDX, FIB and TEM. The mechanical properties were studied by means of microhardness and compression and tensile tests at different temperatures and high strain rate tests. In addition, the mechanical properties are also compared against an Al-based composite containing micro-size SiC particles and a 6061 Al alloy matrix produced by novel powder metallurgy processes at industrial scale. The novel nanocomposites show a good combination of strength and ductility improving the toughness of the composites considerably. These novel nanomaterials require a careful control of the chemical composition and the extrusion temperature range in order to make these nanocomposites directly transferable to industry. The good combination of properties obtained in the material produced in bulk shape show the feasibility for scaling up the production without compromising the mechanical behaviour, showing a strong potential for industrial applications in the near future.