High strength aluminum
alloy powders, extrusions, and forgings are provided in which the aluminum alloys exhibit high strength at atmospheric temperatures and maintain high strength and
ductility at extremely low temperatures. The
alloy is produced by blending about 89 atomic % to 99 atomic % aluminum, 1 atomic % to 11 atomic % of a secondary
metal selected from the group consisting of
magnesium,
lithium,
silicon,
titanium,
zirconium, and combinations thereof, and up to about 10 atomic % of a
tertiary metal selected from the group consisting of Be, Ca, Sr, Ba, Ra, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, W, and combinations thereof. The
alloy is produced by
nanostructure material synthesis, such as cryomilling, in the absence of
refractory dispersoids. The synthesized alloy is then canned, degassed, consolidated, extruded, and optionally forged into a
solid metallic component. Grain size within the alloy is less than 0.5 μm, and alloys with grain size less than 0.1 μm may be produced.