Amorphous and Nanoquasicrystalline Al-based Alloys: Structure and Phase Transformation Studies

F. AUDEBERT

Grenoble

Seminario; FAME EU Master of Science; 2012

Erasmus Programme

Rapid solidification, severe plastic deformation or composite techniques have been used for many years for achieving Al-based materials with improved mechanical properties. Rapid solidification techniques, such as melt-spinning or gas atomisation followed by consolidation processes lead to obtain Al alloys composed by small Al grain matrix, high solute content and high volume fraction of intermetallic particles. Among the Al alloys produced by rapid solidification the NanoQuasicrystalline alloys composed by submicron sized quasicrystalline particles embedded in an fcc-Al matrix have been produced with high strength at elevated temperature. Different Al based nanoquasicrystalline alloys have been developed in the recent years. Particularly, it was observed the additions of Ti and Nb to the Al-Fe-Cr alloys increase the stability of the quasicrystalline phase delaying the microstructural transformation to higher temperatures. These alloys maintain a high strength at elevated temperatures making them a promising candidate for industrial applications.