Abstract: In order to examine the combined effect of plastic deformation and the T6 treatment on Al-Zn-Mg-Cu alloys, a 7075 Al alloy was subjected to cold-rolling (CR) deformation and T6 heat-treatment (T6) in two different routes of CR+T6 (CR followed with T6) and T6+CR (T6 treatment followed with CR), respectively, and characterized by optical microscopy, transmission electron microscope, and mechanical tensile property measurement. The results show that the cold-rolling before T6 heat treatment has less influences on the tensile strength and elongation of the CR+T6 samples. While the yield strength and ultimate tensile strength of T6+CR samples are remarkably improved with increasing the deformation, and the T6+40% deformation (the optimized T6+CR) sample exhibits superior strength with adequate plasticity, with less energy consumption compared with the 60% deformation T6 sample (the optimized CR+T6). Microstructure investigation reveals that the grain-boundary strengthening and dislocation streng-thening are the primary reasons for the improved mechanical properties of CR+T6 and T6+CR samples.
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2017, Vol. 31 
