The model has been developed using binary phase diagrams of Al- and Mg- alloys. is means that the in uence of any alloying ele-ment in the aluminum or magnesium melt on its liquidus temperature can be expressed as the e ect of an equivalent and the latent heat. 18.0 MPa. The melting point of reference element is known and constant. The slight discrepancies between measured and calculated values of liquidus temperatures (Tables 2 and 3) for aluminum and magnesium hypoeutectic cast alloys are related to the fact that the interaction among alloying elements from aluminum and magnesium melts has not been taken into consideration in (6a) and (6b). Another advantage of a new equivalency method can be recognized in its general application to calculate the liquidus temperatures of other alloys. Most of the data used in the above listed software packages are based on binary or multicomponent phase diagrams, but unfortunately, except for binary diagrams, many of the ternary or higher order phase diagrams are still not accurate enough for this purpose. The SiEQ and/or for the alloying elements as well as for some impurity elements can be determined as the sum of individual contributors () plus the effect of the silicon/aluminum itself, and can be expressed as follows: The characteristic liquidus temperatures for multi component Al-Si and Mg-Al series of alloys can be calculated using following equations: Equations (6a) and (6b) are valid for the following concentrations of key elements (expressed in wt.%): The validity of the calculation procedure presented above was determined by comparing the calculated liquidus temperatures with the experimentally determined and computed (using Thermo-Calc software package) liquidus temperatures of aluminum and magnesium alloys. Figure 6 together with Table 4 demonstrate the pretty fair accuracy of the predictions made by the procedure developed in this study in comparison with the measured liquidus temperatures taken from the literature and calculated with Thermo-Calc software. 2610 psi. The Mg-Al binary phase diagram [10]. Figure 2 shows the binary Mg-Al phase diagram with limited Al and Mg solubility [10]. 145 : MPa : 21000 : psi : Elongation (F) ,min. the base metal reaches its solidus temperature. Brazing Considerations. Heat Treatment of Aluminum Alloys Report 08-2 - A.5 Research Team: ... at a temperature that is a few degrees lower than the solidus temperature of the alloy in order to form a single-phase solid solution. This practice, while adding operations, and hence cost, improves resistance to stress corrosion cracking while not reducing the strength of the forgings.The strength properties of aluminum alloys are affected by alloy composition, forging process variables and the final heat treatment. This tem-perature difference may be as small as 10°-18°F (5°-10°C). The governing rule for aluminum brazing is that the filler metal has to liquidize before the base metal reaches its solidus temperature. For the multicomponent alloys, the equivalent concentration of the reference element needs to be considered as additive. In addition, the higher cooling rates applied in the experimental data presented in Tables 2 and 3 are a potential source of inaccuracy that cannot be disregarded. Potentially, a similar approach could be used to develop an algorithm for the calculation of the solidus temperature of other light alloys. It is one of the more popular alloys in its series (alongside alloys 6005, 6061, and 6063), although it is not strongly featured in ASTM (North American) standards. Major alloying elements, Si, Cu, and Mg, are primarily responsible for defining the microstructure of the aluminum alloy. We will be providing unlimited waivers of publication charges for accepted research articles as well as case reports and case series related to COVID-19. In order to predict the various physical parameters of a solidifying aluminum and magnesium alloys (e.g., fraction solid), the liquidus temperatures of these alloys must be known with the highest possible degree of accuracy. Silicon as a reference element has been chosen for aluminum alloys and aluminum for magnesium alloys.