Crystallization of Al-Ni-Ce glass and implications for control of mechanical properties during powder consolidation

Trabajo presentado en el 9th International Symposium on Metastable Mechanically Alloyed and Nanocrystalline Materials (ISMANAM), celebrado en Seúl (Corea del Sur), del 8 al 12 de septiembre de 2002The crystallization behaviour of an Al-based glass is examined looking both at the early stages when nano-sized Al crystals appear and their subsequent growth to very large sizes at longer annealing times before, eventually, other intermetallic phases appear. The growth of the Al crystals to very large size takes place by a dendritic-like destabilisation of the Al crystals-glass interface and the formation of a glass-Al eutectic mixture. Mechanical properties during such annealing have been evaluated by hardness and bend testing on melt-spun ribbons and, where possible, by tensile testing. The changes of properties seen are discussed in terms of the structural changes. Good mechanical behaviour may be controlled by the appearance of many small Al crystals, by the onset of rapid eutectic colony growth, or by changes in the glass matrix.Peer reviewe