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Yield stress development during age-hardening of AA6xxx: comparison of two model predictions with experimental findings
The yield stress development of various Al-Mg-Si alloys was modeled by two work hardening simulation tools and compared to experimental results. Four different alloys were used: Three high-purity ternary laboratory alloys, i.e. Al-0.4wt%Mg-0.4wt%Si, Al-0.6wt%Mg-0.8wt%Si, and Al-0.4wt%Mg-1.0wt%Si; plus a commercial AA6016 alloy with 0.45wt%Mg-1.0wt%Si besides further elements. The age-hardening-behavior during artificial ageing was recorded via hardness and tensile testing. Yield stress modeling was performed with two simulation tools: 3IVM+, developed at IMM RWTH-Aachen University, a dislocation density based work hardening model assuming a cellular dislocation structure; and NaMo, developed by O. R. Myhr and Ø. Grong, a yield stress model adding various strength contributions to obtain the overall yield stress. To be able to simulate the observed yield stress development, knowledge on the actual microchemistry is essential. NaMo contains a built-in microchemistry model. For 3IVM+ these data needed to be extracted from assumptions and experimental findings. The comparison of experimental results to model predictions will be discussed.