Abstract

In the present work, the solidification process and hot tearing behaviors of AZ series magnesium alloys were investigated. The solidification process was analyzed by differential thermal analysis (DTA), and the hot tearing behaviors were studied by a home-made T-shaped mold. The Clyne and Davis’ model was modified to suit for the prediction of the hot tearing susceptibility (HTS) of ternary alloys. The results showed that the predicted HTS using the modified CSC’ are consistent with the experimental tested hot crack volume for AZ series alloys. The HTS of the alloys are, CSC’ (AZ31) > CSC’ (AZ61) > CSC’ (AZ91). With the increasing of Al, the content of Mg17Al12 phase increased and the temperature of coherent point decreased. The Mg17Al12 phase significantly influenced the later stage refilling during the solidification process.

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