Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar
The effects of aging treatment on the microstructure and properties of Al-Zn-Mg-Cu extruded bars were investigated.The results show that the alloys treated by two-stage aging and re-aging(TSR),retroregression and re-aging(RRA),and non-isothermal aging(NIA),compared to the treatment with T73,all present better intergranular corrosion(IGC)resistance,with the maximum corrosion depth down from 70 μm to 19,48,and 30 μm,respectively.Compared to those treated by RRA and NIA,the TSR-treated alloy has the similar tensile strength and yield strength,but obviously superior IGC.After the treatment of T73,TSR,RRA,and NIA,the alloy has its grain boundary precipitates with average size of 27.7,39.2,31.6,and 25.5 nm,respectively,and matrix precipitates with average size of 8.1,10.2,10.9,and 11.0 nm,respectively.
Al-Zn-Mg-Cuextruded baraging treatmenttwo-stage aging and re-aging(TSR)retroregression and re-aging(RRA)non-isothermal aging(NIA)microstructuremechanical propertiescorrosion resistance performance
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