Abstract

nanoscale precipitates in the Al-Zn-In-Mg-Ti-Mn alloy were investigated by regular and high resolution transmission electron microscopy (TEM and HRTEM) and by selective area electron diffraction (SAED). The cast alloy contains the hexagonal structure MgZn2 and the orthorhombic structure Al6Mn precipitates, but after aged the precipitates of the cubic structure Mg2Zn11 were found. The Mg2Zn11 precipitates can act as activation centre, make the alloy pitting. But the activation of Al6Mn precipitates is very little.

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