Thixoforming of an Al-Si-Zn-Mg Alloy - Thermodynamic Characterization, Microstructural Evolution and Rheological Behavior

Aluminiums for thixoforging and preparatory conditions and parameters necessary before forming: A review

“…11 exhibit for Al5Si5Zn0.5 Mg alloy the thixoforming process parameters obtained under different kinetic conditions. Rodrigues Dantas et al [ 32 ] observed that the cooling rate changes little the liquidus temperature, while the heating rate has a more significant effect on the liquidus temperature in the studied range, due to the reaction inertia. They offer the same explanation for the solidus temperature decreases with increasing the cooling rate.…”

“…Rodrigues Dantas et al [ 32 ] used numerical simulation accomplished under the Scheil condition and applied the differentiation method to DSC data to estimate the thermal stability of the Al–Si–Zn–Mg alloy and to identify the thixoforming working range, respectively. Fig.…”

“…11 Evolution of thixoforming process parameters for Al5Si5Zn0.5 Mg alloy under various kinetic scenarios: temperature (a) and liquid fraction (b). The Scheil condition is shown with a heating rate of 0, and cooling rates are represented by negative heating rates; [ 32 ]. …”

The effect of the chemical distribution on the mechanical properties of the Al-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy after thixoforging and solution heat treatment

“…Note that, several alloys from the Al-Si-Mg, Al-Si-Zn and Al-Zn-Mg tertiary systems are successfully used as thixoforming feedstock as presented by ZOQUI [7]. However, the simultaneous combination of these elements (the quaternary Al-Si-Zn-Mg system) for SSM processing applications was barely studied and represents a potential range of feedstock that combines the advantages of the thixoforming process with the possibility of heat treatment after forming for improved mechanical performance as presented by PRONI et al [18], PRONI et al [19] and DANTAS et al [20]. Second phase particles found in precipitation hardenable Al-alloys are classified in three categories:…”

“…In this work, theAl-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy is studied. Its thermodynamic stability, microstructural evolution during partial melting and rheological behavior under compression in the semisolid state were successfully evaluated in a previous studies by PRONI et al [18], PRONI et al [19] and DANTAS et al [20]. Here the mechanical performance (tensile test and hardness) of this alloy will be evaluated as a response to the distribution and combination of its alloying elements and how these features are affected by strain (thixoforming operation) and heat (SHT) imposed to the alloy.…”