The effects of regression heating rates on the microstructure and properties of Al-6.02Zn-2.24Mg-2.30Cu alloy were investigated by means of tensile tests at room temperature,slow strain rate stress corrosion and transmission electron microscopy.The results show that with the decrease of the regression heating rate,the time in the region of high temperature increases,the strength of the alloy continuously decreases.When the regression heating rate decreases from 5.6℃/min to 0.25℃/min,the tensile strength decreases from 663.1 MPa to 631.7 MPa,while the conductivity and corrosion resistance of the alloy increase gradually,the index of sensitivity to stress corrosion decreases from 4.7%to 2.7%.The regression heating rate slows down,the growth degree of the inner-grain phase increases,which leads to the decrease of the alloy strength.But at the same time,with the increase of grain boundary precipitates'size and distribution spacing,as well as the Cu content in grain boundary precipitates also increases,which improves the corrosion resistance of the alloy.
NETL
NSTL
万方数据
