Abstract
Rapid solidification technology offers several advantages over the ingot metallurgy methods when used for manufacturing Al-Li alloys. These include: (1) increasing lithium contents in excess of the practical maximum of 2.7wt% for the ingot alloys, (2) refinement of grains and secondary phases, (3) utilization of strengthening mechanisms, such as dispersion hardening, and substructure hardening. Therefore it is reasonable that RSP Al-Li alloys have more satisfactory performances than their IM counterpart. Unfortunately, this is not true, though the density is further reduced and strength is obviously improved by the increased Li contents; the ductility and toughness of RSP Al-Li alloys are even lower than that of the IM Al-Li alloys. The object of this paper is to study the fracture mechanisms in a RSP Al-Li-Mg-Cu-Zr alloy by an in-situ tensile test in a transmission electron microscope in order to explore the reasons that impede the improvement of ductility and toughness of RSP Al-Li alloys.
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