Precipitation Sequence of Al-Mg-Cu (-Ag) Alloys

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...

Precipitation Hardening of Al–Si–Mg Alloys

Temperature Effects on the Tensile Properties of Precipitation-Hardened Al-Mg-Cu-Si Alloys

Because the mechanical performance of precipitation-hardened alloys can be significantly altered with temperature changes, understanding and predicting the effects of temperatures on various mechanical properties for these alloys are important. In the present work, an analytical model has been developed to predict the elastic modulus, the yield stress, the failure stress, and the failure strain...

Microstructure and Precipitation in Al - Li - Cu - Mg - ( Mn , Zr ) alloys

Hot rolled Al-6Li-1Cu-1Mg-0.2Mn (at.%) (Al-1.6Li-2.2Cu-0.9Mg-0.4Mn, wt.%) and Al-6Li-1Cu-1Mg-0.03Zr (at.%) (Al-1.6Li-2.3Cu-1Mg-0.1Zr, wt.%) alloys developed for age forming were studied by tensile testing, electron backscatter diffraction (EBSD), three-dimensional atom probe (3DAP), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). For both alloys, DSC analysis...

A Model for Precipitation Kinetics and Strengthening in Al-Cu-Mg Alloys

A physically-based numerical model is developed to predict the microstructural evolution and strengthening in Al-Cu-Mg alloys during isothermal treatments. The modelling of the formation kinetics of the precipitates is based on the Kampmann and Wagner model. The strengthening by the shearable Cu:Mg co-clusters is modelled on the basis of modulus strengthening mechanism and the strengthening by ...