Effects of interrupted ageing and asymmetric rolling on microstructures, mechanical properties, and intergranular corrosion behavior of Al-Mg-Si-Zn alloy

Abstract

Effects of interrupted ageing (T6I6) and asymmetric rolling on microstructures, mechanical properties, and intergranular corrosion (IGC) behaviors of Al-Mg-Si-Zn alloy were investigated. Results showed that the T6 alloy has the lowest strength and the worst IGC resistance, while the T6I6 alloy has higher strength and better IGC resistance. What’s more, the alloy treated by pre-rolling deformation has higher strength and better IGC resistance; and the alloy treated by the pre-asymmetry rolling achieves the highest strength, the best IGC resistance and lower elongation. The mechanical properties depend on microstructures such as the grain size, texture, dislocation density and precipitation, the grain boundary misorientation and grain boundary microstructure are responsible for the IGC resistance.

Keywords

Al-Mg-Si-Zn alloy / interrupted ageing / asymmetric rolling / microstructure / mechanical property / intergranular corrosion property

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