Abstract
Hot tearing susceptibility of Mg–5(Zn + Y)–0.5Zr alloys was predicted based on Clyne–Davies’ model. The solidification contraction force curves of Mg–5(Zn + Y)–0.5Zr alloys were obtained by using the ‘T’ type hot tearing permanent-mold were tested. The predicted values of CSC agree well with the measured values of crack volume. The hot tearing susceptibility of the alloys is as follows: Mg–3.75Zn–1.25Y–0.5Zr > Mg–4.29Zn–0.71Y–0.5Zr > Mg–3Zn–2Y–0.5Zr > Mg–2.5Zn–2.5Y–0.5Zr. The phase constitution and fracture morphology of hot tearing regions of the alloys were observed by x-ray diffraction and scanning electron microscopy. The experimental indicated that the type and amount of secondary phase were controlled by Zn/Y ratio. When Zn/Y ratio varies from 1 to 6, the secondary phase changes from W-phase, W + I phases to I-phase. The hot tearing susceptibility of Mg–5(Zn + Y)–0.5Zr alloys increases with increasing Zn/Y ratio from 1 to 3 due to the increasing of solidification temperature range, the increasing of the grain size and the decreasing of the amount of remaining liquid. Further increased Zn/Y ratio from 3 to 6, the hot tearing susceptibility decreases because the solidification temperature range decreases and the quasicrystal I-phase enhances the intergranular bonding force.
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