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The effect of solution heat treatment(SHT) on mechanical properties,microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu-0.6Zn alloy was investigated by tensile test,Erichsen test,surface topography,scanning electron microscope(SEM) and electron back-scattered diffraction(EBSD).The results indicate that with the increase in SHT temperature,yield strength and cupping test value(I_E) of the sheets increase greatly and reach a peak value,then decrease.Meanwhile,intermetallic compounds dissolve into matrix gradually.The grains grow up as SHT temperature increases,and abnormal grain growth leads to the surface defects after solution-treated above 560 ℃.Considering mechanical properties,I_E value,residual phases,grain size and surface quality of the sheets,SHT temperature for the alloy should not be higher than 550 ℃.
The effect of solution heat treatment (SHT) on mechanical properties, microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu-0.6Zn alloy was investigated by tensile test, Erichsen test, surface topography, and electron back-scattered diffraction (EBSD). The results indicate that with the increase in SHT temperature, yield strength and cupping test value (I_E) of the sheets increase greatly and reach a peak value, then decrease. Meanwhile, intermetallic compounds dissolve into matrix gradually. The grain grows as SHT temperature increases, and abnormal grain growth leads to the surface defects after solution-treated above 560 ° C.Considering mechanical properties, I_E value, residual phases, grain size and surface quality of the sheets, SHT temperature for the alloy should not be higher than 550 ° C.