Preparation of bulk crystallite alloys by rapid quenching of bulk undercooled melts

摘要

Rapid quenching of deeply bulk undercooled alloy melts (200-250 K) before recalescence was used to produce three-dimensional bulk crystallite alloys. It was found that the micro-grain sizes of the prepared bulk crystallite alloys decreased with increasing undercooling. Dense crystal defects such as dislocation networks and annealing twins could be observed in the microstructures of the crystallite alloys. Substantial recrystallisation could be observed when annealing these crystallite alloys. These new findings could expand and enrich not only the traditional methods of preparing three-dimensional bulk crystallite alloys but also the traditional technologies of recrystallisation.