Magnesium Alloy Research Studies
RENSSELAER POLYTECHNIC INST TROY NY
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Diagrams are presented to show the constitution at 500 F and 700 F for the magnesium-lithium-aluminum and magnesium-lithium-zinc alloy systems. These diagrams were determined mainly by microscopic examination of alloys quenched from elevated temperatures. The solubility for aluminum and for zinc was less at 500 F than at 700 F but solubility for lithium was almost the same at these two temperatures. The study of dilute magnesium alloys found a good combination of properties for magnesium-1.0 zinc-0.4 cerium. Addition of cerium refined the grain structure and introduced a small amount of a second constituent. The best properties were obtained with a fine equiaxed grain structure produced by warm rolling and annealing just above the recrystallization range. These conditions of structure and properties were not obtainable by a single cycle of cold rolling and annealing. Single crystals of high purity magnesium were grown by controlled solidification in a gradient furnace. The furnace and the mold remained stationary and only the temperature gradient moved. The conditions of growth were found to be more critical for single crystals of magnesium-aluminum and magnesium-zinc alloys.
- Metallurgy and Metallography