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The microstructures of a severely deformed Al–Zn–Mg–Cu (AA7136) alloy have been characterized carefully using transmission electron microscopy and three-dimensional atom probe analysis. The Fe-rich intermetallic particles are predominantly Al13Fe4 type in the as-extruded alloy. Significantly, equal-channel angular pressing (ECAP) at 200°C refines Fe-rich particles from ∼1 to 2μm to as small as ∼50nm...
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