Post-β″ phases and their influence on microstructure and hardness in 6xxx Al-Mg-Si alloys

Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model

“…It indicates that it is thermodynamically easier to nucleate the Mg richer phases in the Mg rich alloys. Even though the accuracy of the interfacial energies for the involved metastable phases should be improved to achieve better predictive power on nucleation, this observation qualitatively supports the conclusions drawn from TEM characterization by Marioara et al [1] that an alloy tends to select as main post-β'' phase the precipitate having the Si/Mg ratio closest to the alloy's own Si/Mg ratio. The model is composition dependent owing to its coupling with the CALPHAD database, and could be used for other alloys or different heat treatment conditions.…”

“…Two Al-Mg-Si alloys that had earlier been studied in [1], are considered. Following the notation in [1], they are labelled as A3 and A12 with compositions (in atomic percent) of Al-0.58Mg-0.72Si and Al-0.72Mg-0.57Si, respectively.…”

“…Following the notation in [1], they are labelled as A3 and A12 with compositions (in atomic percent) of Al-0.58Mg-0.72Si and Al-0.72Mg-0.57Si, respectively. Two heat treatments were performed as reported in [1].…”

“…Following the notation in [1], they are labelled as A3 and A12 with compositions (in atomic percent) of Al-0.58Mg-0.72Si and Al-0.72Mg-0.57Si, respectively. Two heat treatments were performed as reported in [1]. The first one, labelled H1, consisted of a 2 hours solution heat treatment at 570 • C, waterquench to room temperature (RT) and four hours RT-storage before ageing.…”

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

“…[1][2][3] Because the former strength contribution is by far the most important one, the precipitation sequence and resulting strength evolution occurring during natural and artificial aging of the alloys have been extensively investigated and reported upon in the scientific literature. [4][5][6] In addition, the chemical composition and atomic structure of the clusters and hardening precipitate which form have been studied in detail by means of various high-resolution experimental techniques along with atomistic modeling. [7][8][9][10] Obviously, some of these works must be said to be at the leading edge of international materials research, which gives aluminum a competitive advantages compared to other structural and functional materials that are not so thoroughly examined.…”