Abstract
Quench-induced S(Al2CuMg) phases are generally formed in Al-Zn-Mg-Cu alloys. The precipitation and relative crystallographic relationships of η-type (MgZn2) precipitates at the interfaces between the quench-induced S phases and Al matrix were studied in an Al-Zn-Mg-Cu alloy by coupling Cs-corrected scanning transmission electron microscopy (STEM) with scanning precession electron diffraction (SPED) technology. It was found that Zn segregation occurred at S-Al interfaces due to higher lattice strain energy, which induced the heterogeneous nucleation of nanosized η’ precipitates at these interfaces. Crystallographic orientation relationships (ORs) between the S phases and η’/η precipitates were firstly reported and discussed in Al-Zn-Mg-Cu alloy. With the coarsening of η precipitates at S-Al interfaces, a new type of OR ([112]Al//[1¯21¯0]η, (111¯)Al//(101¯3)η) between the interfacial η precipitates and Al matrix was identified, which was different from their non-interfacial counterparts in Al matrix reported to date.
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