An electron microscopic study of the age hardening of duralumin
Precipitation in duralumin-type Al-Cu-Mg alloys is more complex than that in binary Al-Cu alloys. According to Brommelle and Phillips (1), the principal constituents present in equilibrium in these alloys are: (1) the aluminium-rich solid solution a; (2) the phase Al2CuMg (S phase); and (3) the phase CuAl2 (θ-phase). The relative amounts of S and θ depend upon the copper to magnesium weight ratio in the alloy, the equilibrium ratio being equal to 2.6. If the ratio is less than 2.6 in the alloy, then the phases present in equilibrium will be only the solid solution a and S, on annealing near the solidus temperature.
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