The constituents in Al–10Zn–2.5Mg–2.5Cu aluminum alloy

The constituents in Al–10Zn–2.5Mg–2.5Cu aluminum alloy and their morphology and distribution pattern in the subsequent working process were investigated by SEM, energy spectrum microanalysis and X-ray diffraction. Constituents in the alloy consisted of Al7Cu2Fe and Al14Mg33Zn37Cu13 of the same crystal structure with Mg32(AlZn)49. The compositions of alloy elements in Al14Mg33Zn37Cu13 all had a broad range. During the extrusion of alloy ingot, Al7Cu2Fe crushed obviously and distributed along the extrusion direction, Al14Mg33Zn37Cu13 crushed slightly. But Al14Mg33Zn37Cu13 in the extrusion rod with heat treatment was easy to break during the tensile test and became the source of the crack.