Materials Frontier No.157
Title: High Strength Nanostructured Aluminium Alloys with Enhanced Electrical Conductivity
Speaker: Dr. Ilchat Sabirov, Senior Researcher and head of research group at IMDEA Materials Institute, Madrid
Inviter: Prof Deliang ZHANG
Dr. Ilchat Sabirov earned his PhD degree fromUniversityofLeoben(Austria)in 2004. He was a Post-Doctoral Fellow at the Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences in 2004-2005 and Academic Researcher at Deakin University (Australia) in 2005-2009. He is now Senior Researcher and head of research group at IMDEA Materials Institute (Madrid, Spain). He was awarded the Ramon y Cajal Fellowship by the Spanish Ministry of Economy and Competitiveness. His research activities have been focused on development of novel SPD processing routes for fabrication of ultra-fine grained and nanostructured metallic materials with superior
mechanical and functional properties with greater respect to their further commercial applications, as well as on physical simulation of various metallurgical processes. Dr. Sabirov has been a coordinator or principal investigator in a range of European projects focused on SPD and physical simulation of materials processing. He was also a co-organizer of several international symposiums and conferences.
Mechanical strength and electrical conductivity are the most important properties of conducting metallic materials used in electrical engineering. Today, there is a growing need in this field for innovative conductor materials with improved properties. Meanwhile, the main issue is that high electrical conductivity and high strength are usually mutually exclusive due to physical nature of these properties. For example, alloying of pure metals results in significant increase of their mechanical strength, whereas electrical conductivity dramatically drops due to the scattering of electrons at solutes and precipitates. Recent studies have revealed that intelligent nanostructuring of metallic materials can result in combination of high mechanical strength with enhanced electrical conductivity. It was demonstrated that the mechanical strength and electrical conductivity of these materials are primarily controlled by their microstructure, of which the grain size, morphology of second phases and their distribution, as well as dislocation structures are the most important parameters.
In the present talk, the fundamentals of nanostructuring to achieve high strength and high electrical conductivity in Cu, Al, and their alloys will be analyzed with the emphasis on physical mechanisms behind the strength and resistivity of nanostructured metals. Short overview of the developed up to date techniques for nanostructuring in Cu, Al and their alloys will be made. The effect of nanostructure (grain size, size and volume fraction of second phase precipitates, dislocation density, grain boundary structure, etc) on strength and electrical conductivity of metallic materials will be considered. Future prospects of intelligent nanostructural design to further improve mechanical strength and electrical conductivity in these materials will be discussed.