It is found that Li2Sb compound can act as the nucleus of primary Mg2Si during solidification, by which the particle size of primary Mg2Si decreased from ~300 to ~15–25 μm. Owing to the synergistic effect of the Li2Sb nucleus and adsorption-poisoning of Li atoms, the effect of complex modification of Li-Sb on primary Mg2Si was better than that of single modification of Li or Sb. When Li-Sb cont...

The role of Mg2Si in the electrochemical behavior of Al-Si-Mg aluminum alloys has been studied using four experimental aluminum alloys with variations in the Si/Mg molar ratio (A1-0.12, A2-0.49, A3-0.89, A4-1.05), in neutral aerated 0.1M NaCl solutions. Accordingly, the corrosion potential in open circuit (Eoc) and polarization resistance (Rp) were measured. Results show that the augment in Si/...

Nine Al-(1-3)Mg-(0-0.4)Cu-0.15Si-0.25Mn (in wt%) alloys with potential applications in both packaging and automotive industries have been investigated. Tensile testing showed that solution strengthening is in good approximation linearly proportional to the Mg content. Mechanical testing and microstructural examinations of aged samples indicate that Mg2Si phase precipitates contribute to age har...

High-resolution electron microscopy was employed to characterize the interface structure of a cast Al-Mg-Si-Bi-Pb aluminium(6262)-based composite reinforced by alpha alumina particles with a trace of beta alumina in order to investigate the behaviour of alloying elements in cast composites. Except for a few primary Mg2Si particles, few reaction products were detected at the interface of Al/alph...

Aluminum alloys of the 6xxx series which contain excess Si or Cu are well used for the automotive applications because of the high age-hardening response. The effect of addition of small amount of Sn on the two-step aging behavior in 1.2%Mg2Si-0.5%Si in excess alloy and 1.2%Mg2Si-0.7%Cu alloy was investigated by means of hardness measurement, differential scanning calorimetry, and transmission ...

The effect of the Mg/Si ratio Al-2.5Li-1Cu-0.8Mg-0.8Si, Al-2.5Li-1Cu-1.6Mg-0.8Si, and Al-2.5Li-1Cu-2.4Mg-0.8Si alloys on microstructure evolution mechanical properties was investigated. results show that primary phases their morphologies in as-cast are found to vary with ratio. improvement promotes formation Mg2Si phase at expense AlLiSi phase. Moreover, a tiny amount TB-Al7.5Cu4Li transforms i...

The effect of solution temperature on the aging hardening behavior Al-15%Mg2Si(-1%Cu) alloys was studied by characterizing precipitation behaviors nano-precipitates. After rises from 520 °C to 550 °C, more solute atoms are available for precipitation, and formation activation energies precipitates (?'' S) decrease. So ?''/?? in Al-15%Mg2Si alloy S Al-15%Mg2Si-1%Cu is accelerated at a which enha...