Edge interfaces of the ? plates in a peak-aged Al-Cu-Mg-Ag alloy

A model for the electrical conductivity of peak aged and overaged Al-Zn-Mg-Cu Alloys

A physically-based model for the electrical conductivity of peak aged and overaged Al-Zn-Mg-Cu (7xxx series) alloys is presented. The model includes calculations of the η and the S phase solvus (using a regular solution model), taking account of the capillary effect and η coarsening. It takes account of the conductivity of grains (incorporating dissolved alloying elements, undissolved particles...

THREE DIMENSIONAL ATOM PROBE ANALYSIS OF PRE-PRECIPITATE CLUSTERING IN AN Al-Cu-Mg-Ag ALLOY

Trace element additions in age hardening aluminum alloys often modify precipitation products and kinetics. In the case of Al-Cu alloy, combined addition of trace amount of Mg and Ag leads to precipitation of fine and uniform dispersions of plate-like Ω phase on the {111}Al planes in addition to the θ′ precipitates on the {001}Al planes [1,2]. The Ω phase shows high thermal stability and resista...

DISLOCATION INTERACTION WITH SEMICOHERENT PRECIPITATES (O PHASE) IN DEFORMED Al±Cu±Mg±Ag ALLOY

ÐThe interaction between dislocations and semicoherent precipitates (O phase) is discussed. The investigation shows that the semicoherent precipitate is cut by dislocations during deformation. Conventional TEM and HRTEM observations demonstrate that shearing of precipitates by dislocations occurs by multiple cutting of the precipitate. A strengthening mechanism is proposed based on this observa...

CORROSION BEHAVIOUR OF Al-Li-Cu-Mg ALLOY 8090-T651

Clustering and Segregation of Mg and Ag Atoms during the Precipitation Processes in Al(-Li)-Cu-Mg-Ag Alloys

This paper reports three dimensional atom probe (3DAP) results of solute clusters and precipitates in early aging stages of Al-Cu(-Li) alloys containing small amounts of Ag and Mg atoms. In an as-quenched Al-1.9Cu-0.3Mg-0.2Ag (at.%) alloy, solute atoms are uniformly dissolved. On aging for 5 s at 180°C, Ag and Mg atoms form co-clusters. These co-clusters do not have well defined shape, but they...