Abstract
The microstructures of 7075 + 1% Ni + 0.8% Zr, and the lithium containing X2020 high strength aluminum alloys processed by liquid dynamic compaction (LDC) were investigated using transmission electron microscopy. The intragranular precipitation of the major strengthening phases in the LDC alloys is not significantly altered from that in RS-PM alloys of equivalent compositions. Precipitate free zones are seldom observed in the LDC alloys. No significant difference was found in the intragranular precipitation of the as-deposited and hot rolled LDC compact when compared to that of the as-deposited and hot extruded LDC material. Hot rolling, however, appears to promote precipitation of the excess phases at the grain boundaries. Deformation of the LDC compacts by hot extrusion suggests improvements in toughness and fatigue resistance by a more efficient redistribution of any excess phases and by retention of uniformly precipitated intragranular strengthening phases.
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