Effect of Trace Sc and Zr on Sensitized Corrosion Behavior of Al-Mg-Mn Alloy
Al-5.5Mg-0.3Mn-0.2Sc-0.1Zr alloy was prepared by adding trace Sc and Zr to Al-5.5Mg-0.3Mn alloy,and effects of Sc and Zr on sensitized corrosion behavior of Al-Mg-Mn alloys were investigated by intergranular corro-sion as well as stress corrosion combined with OM,SEM and EBSD microscopic observation.The results indicate that the grain size of Al-Mg-Mn alloy is refined,and recrystallization can be inhibited by Sc and Zr,increasing the dis-location density and the proportion of low angle grain boundary of the sheet.The grain boundary is optimized,and the precipitation and distribution of β phase during sensitized heat treatment process are improved,thus reducing the sensi-tivity of intergranular corrosion and stress corrosion.
NETL
NSTL
万方数据
