Prediction of Yield Strength at Room Temperature for Squeeze Cast A226

Abstract:

Predicting yield strength of the cast is difficult, mainly due to inherent chemical inhomogeneity of the microstructure and metal matrix composite nature of the cast. In our approach to predict the yield strength of as cast material AlSi9Cu3(Fe), Scheil-Gulliver model has been used to calculate the phase fraction and chemical composition of each phase during solidification and at each temperature step. Inhomogeneity of the microstructure has been taken into account by considering the evolution of pre-eutectic and eutectic fractions separately. The solidification time-temperature data and cooling to room temperature are recorded using thermocouples and serve as input for the thermo-kinetic software “MatCalc”, that has been used for Scheil simulation and takes into account the evolution of microstructure after solidification and during any arbitrary cooling rate. The strengthening model takes into account the contributions of the intrinsic yield strength of the aluminum matrix, solid solution strengthening, precipitation hardening, effect of eutectic silicon portion and dendrite arm spacing size effect. The phases taken in to consideration include α-Al, Intermetallics, Si and Cu-rich precipitates. The predicted yield strength values are validated by comparing with the experimental values. This approach is extendable to calculate yield strength of the as-cast and heat-treated aluminum alloys.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 658-663
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.658
• Online since: June 2014
• Authors: Ahmad Falahati*, Manoj Kumar, Michael Just
• Keywords: AlSi9Cu3(Fe), Aluminum Cast, MatCalc, Modeling, Precipitation Kinetics, Squeeze Cast

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