Al-Cu-Mg alloys have widespread applications in the aerospace and transportation industries, due to their high specific strength [1] , good oxidation and corrosion resistance, high melting temperature (among Al alloys), and good thermal conductivity [2] . The excellent strength properties of these age-hardenable Al alloys originate from precipitation of the nanoscale metastable phases [1,3,4] , namely θ"-Al 3 Cu with a tetragonal structure (a=0.404 nm and c=0.768 nm), θ'-Al 2 Cu with a tetragonal structure (a=0.404 nm and c=0.580 nm) [3,5,6] , GPB2/S"-Al 10 Cu 3 Mg 3 with an orthorhombic structure (a=0.405 nm, b=1.620 nm and c=0.405 nm) [5,7] , and S'-Al 2 CuMg with an orthorhombic structure (a=0.405 nm, b=0.916 nm and c=0.720 nm) [1,5,6] , in α-Al matrix during age hardening treatments.
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