首页|Precipitation and crystallographic relationships of nanosized eta/eta precipitates at S-Al interface in Al-Zn-Mg-Cu alloy '
Precipitation and crystallographic relationships of nanosized eta/eta precipitates at S-Al interface in Al-Zn-Mg-Cu alloy '
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NSTL
Elsevier
Quench-induced S(Al2CuMg) phases are generally formed in Al-Zn-Mg-Cu alloys. The precipitation and relative crystallographic relationships of eta-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 eta' precipitates at these interfaces. Crystallographic orientation relationships (ORs) between the S phases and eta'/eta precipitates were firstly reported and discussed in Al-Zn-Mg-Cu alloy. With the coarsening of eta precipitates at S-Al interfaces, a new type of OR ([112]Al//[1210]eta, (111)Al//(1013)eta) between the interfacial eta precipitates and Al matrix was identified, which was different from their non-interfacial counterparts in Al matrix reported to date.
NSTL
Elsevier
